Niki E. Wintzer
Mark D. Schmitz
Virginia S. Gillerman
Jeffrey D. Vervoort
20200729
Isotopic ratios and element concentrations of U-Pb and Sm-Nd for scheelite petrochronology
spreadsheet
https://doi.org/10.5066/P9QH5ZYP
Niki E. Wintzer
Mark D. Schmitz
Virginia S. Gillerman
Jeffrey D. Vervoort
00000000
Paleogene tungsten-antimony mineralization in the Yellow Pine mining area (Stibnite district), central Idaho
publication
Instrument, standard, and sample data from application of in situ laser ablation-inductively coupled plasma-mass spectrometry (LA-ICPMS) dating of scheelite in thin section, and sample data from isotope dilution thermal ionization mass spectrometry (ID-TIMS) scheelite dating are in this data release. Fractionation factor and ratio data in between NIST glass and natural scheelite as well as isotope dilution Sm-Nd scheelite data are also included. Scheelite is from two ore deposits within the Stibnite-Yellow Pine mining area, and analyses yielded bimodal U-Pb ages with major growth of scheelite in the range of 61.3 ± 4.1 to 55.1 ± 3.8 Ma and a second growth event involving both scheelite and stibnite at 45.8 ± 2.6 Ma. In situ analyses were calibrated and confirmed by ID-TIMS U-Pb lower intercept ages of two coarsely crystalline scheelite samples yielded ages of 56.62 ± 0.16 Ma and 57.52 ± 0.22 Ma. These results, in good agreement with 40Ar/39Ar ages of 57.08 ± 0.12 to 56.2 ± 1.2 Ma from adularia petrographically linked to scheelite, confirm primary scheelite mineralization occurred ca. 57.5 Ma. This geochronology resolves a long-standing debate about the formation age of scheelite and stibnite within the United States’ largest antimony source. Calibration with ID-TIMS provided reliable ages, and crystals from the same sample were used as a matrix-matched primary standard material for LA-ICPMS. No matrix-match standard was previously characterized accentuating the importance of this newly characterized matrix-matched scheelite standard.
These data provide age constraints for scheelite and some stibnite mineralization in the Yellow Pine mining area (Stibnite district), which were previously debated about in geologic literature but had no reliable numerical age. They also provide independent verification of a new natural scheelite standard for laser ablation U-Pb scheelite geochronology.
20150206
20190913
ground condition
None planned
-115.3380900
-115.3377400
44.9271400
44.8992800
World
ISO 19115 Topic Category
geoscientificInformation
None
Scheelite
U-Pb
Geochronology
Sm-Nd
Petrochronology
Standard reference material
Matrix-match scheelite standard
USGS Metadata Identifier
USGS:5ef247fb82ced62aaae3bc40
None
Stibnite, Idaho
None. Please see 'Distribution Info' for details.
None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.
Niki E Wintzer
U.S. Geological Survey
Geologist
mailing and physical
Rm. 202
Spokane
WA
99201
US
509-368-3110
509-368-3199
nwintzer@usgs.gov
Uncertainty ranges are provided.
These data match with the process steps, the associated journal article, and are internally consistent.
These data include the necessary instrument dataset, standard dataset, sample datasets, and reduced data summaries.
Coordinate system: NAD_1927_StatePlane_Idaho_West_FIPS_1103
Datum: WGS 1984
Scheelite-bearing rocks were collected from the Yellow Pine mining area, specifically along the Meadow Creek fault zone and mineral-exploration drill cores that intersect two of the main ore bodies, Yellow Pine and Hangar Flats, and multiple polished thin sections were made. Additionally, the Smithsonian Institution National Museum of Natural History loaned an archived portion of scheelite from the Yellow Pine deposit for this research (sample NMNH 107667).
Two samples, NMNH 107667 from the Yellow Pine deposit, and 6GE-005 from the Hangar Flats deposit, had an apparent single generation of coarse scheelite with sufficient U and radiogenic Pb concentrations to warrant mineral separation and analysis via ID-TIMS. Single scheelite crystals were hand-picked and cleaned in ultrapure water under intense ultrasonication; some crystals were split in pieces for separate analysis. While care was taken to choose clean pieces, minute crystals of stibnite were commonly associated with crystal surfaces and some intermixture of the two minerals was unavoidable. Single crystals or fragments thereof were loaded with 100 μl of 12 M HCl into Savillex PFA capsules, spiked with the BSU-1B mixed 205Pb-233U-235U tracer solution, and dissolved in a gravity oven at 180°C for 12 hours in Parr pressure vessels, resulting in clear solutions.
Because highly insoluble tungstates are formed upon dry down and conversion to other acid matrices, two methods for chromatographic purification of U and Pb were pursued in the trial sample, 6GE-005. Both methods relied upon the high temperature dissolution step in pressure vessels for sample-spike equilibration; its efficacy is borne out by our experience with a variety of accessory minerals. Similarly, both methods take advantage of the differential partitioning of U and W in high molarity nitric acid solutions (in contrast to their similar behavior in concentrated hydrochloric acid). In method 1, the clear 12 M HCl solutions were dried to salts, and then fluxed in 6 M HCl in the same Savillex capsules at 180°C overnight, in Parr pressure vessels. After cooling to room temperature, the supernatant was extracted from the insoluble tungstate residue, dried to salts, and redissolved in 100 µl of 1 M HBr in preparation for anion exchange chromatography. Pb was purified from this solution in a single pass on 100 µl PFA columns of AG1-X8 anion exchange resin by washing with 6 column volumes (cv) of 1 M HBr (saving the loading volume plus the next 2.5 cv as containing the U cut) and 4 cv of 2 M HCl, prior to eluting the Pb cut in 4 cv of 6 M HCl. The initial 3.5 cv of 1 M HBr was dried and converted to 8 M HNO3, and U was purified from the solution on 50 µl PFA columns of AG1-X8 anion exchange resin by washing with 5 cv of 8 M HNO3 to elute calcium and tungsten, followed by 12 cv of 6 M HCl, prior to eluting the U cut in 8 cv of ultrapure water. This U purification process was repeated a second time on the same 50 µl column.
In method 2, the order of elemental purification was reversed. Taking advantage of the high partition coefficient of anionic uranium (and tungsten) complexes in concentrated HCl, the primary spiked scheelite dissolution in 100 µl of 12 M HCl was loaded onto 50 µl PFA columns of AG1-X8 and washed with 4 cv of 12 M HCl, reserving this entire volume as containing the Pb cut. The column was then washed with 5 cv of 8 M HNO3 to elute tungsten and calcium, followed by 12 cv of 6 M HCl prior to eluting the U cut in 8 cv of ultrapure water. This U purification process was repeated a second time on the same 50 µl column. The reserved Pb cut was purified in a single pass using the same dilute HBr-HCl anion exchange chromatographic separation in method 1. Pb and U cuts were dried separately with 2 μl of 0.05 N H3PO4, redissolved at the loading bench in 3 μl of a silica-gel/phosphoric acid mixture (Gerstenberger and Haase, 1997), and dried onto individual single outgassed zone-refined Re filaments. U and Pb isotopic measurements were made on an IsotopX Isoprobe-T multicollector thermal ionization mass spectrometer equipped with an ion-counting Daly detector. Lead isotope ratios were measured by peak-jumping all ion beams on the Daly detector for 160 cycles, and externally corrected for mass fractionation based upon a factor derived from 202Pb-205Pb double-spiked (ET2535; Condon et al., 2015; McLean et al., 2015) gravimetric solutions and samples measured during the same analytical period. Uranium was analyzed as UO2+ ions in static Faraday mode on 1012 ohm resistors for 400 cycles, and corrected for isobaric interference of 233U18O16O on 235U16O16O with an 18O/16O of 0.00206. U mass fractionation was corrected using the known 233U/235U ratio of the tracer solution. Uranium ionization efficiency was a factor of 2-3 higher for method 1 over method 2 purification, and thus subsequent experiments utilized method 1 exclusively. Data reduction including isotopic ratio corrections and error propagation followed the algorithms of Schmitz and Schoene (2007), with the decay constants of Jaffey et al. (1971).
LA-ICPMS was performed with a ThermoElectron X-Series II quadrupole ICPMS and a New Wave Research UP-213 Nd:YAG UV (213 nm) laser ablation system. Details of the instrumental set-up and experimental protocol are summarized in the data repository spreadsheet file. Isotopic ratios and concentrations of U, Th, and Pb and selected trace elements (P, Sr, Y, Mo, Sn, REE, Th, and U) in scheelite were acquired using an 80 µm beam diameter firing at 5 Hz to deliver a fluence of 5 J/cm2 to the sample surface. For sample 8EB-002, 16 of the 28 spots had a smaller beam diameter of 55 µm in order to fit the ablation spot within narrow vein scheelite. Analyte signals were internally standardized to 43Ca, assuming CaWO4 stoichiometry, and converted to concentrations using NIST SRM-610 and -612 glasses as the primary standards. Ablation proceeded at a rate of ~1 µm/s for thirty seconds or until the thin section was transected. The stable time resolved signal included at least 20 full sweeps through the analyte list; a gas blank without laser firing was collected prior to each spot analysis. Pb isotopes in coexisting stibnite, pyrite, or arsenopyrite crystals in the same thin sections were measured to provide an estimate of initial Pb isotopic composition. Data were reduced using standard background subtraction, ratio construction, fractionation correction, and common Pb correction algorithms (Chew et al., 2014; Horstwood et al., 2016), within an in-house Microsoft Excel spreadsheet with Visual Basic macros. SemiTotal-Pb/U regressions or “207Pb-corrected ages” (Tera and Wasserburg, 1972), Total-Pb/U regressions (Ludwig, 1998), traditional 238U-206Pb isochrons, and Tera-Wasserburg concordia visualizations were produced with the algorithms of ISOPLOT 3.0 (Ludwig, 2003).
Two approaches were utilized for the correction of laser-induced U-Pb fractionation in scheelite LA-ICPMS analyses. In early experiments, glass standard NIST 610 was analyzed as the primary U/Pb standard interspersed with sample spots. Subsequent to the characterization of the age of scheelite separated from sample NMNH 107667 via ID-TIMS (methods described above), these crystals were used as a matrix-matched primary standard material for LA-ICPMS. NMNH 107667 spot analyses interspersed with samples were first regressed from an initial 207Pb/206Pb of 0.80501 (estimated using a Total-U/Pb regression on ID-TIMS data for NMNH 107667) using the Semi-Total U/Pb algorithm of Ludwig (1998); the computed “207Pb-corrected” lower intercept date was converted to the corresponding radiogenic 206Pb/238U ratio for use as the primary standard measurement for calculating the time dependent fractionation factor for scheelite (cf. Chew et al., 2014).
A series of independent experiments including both NIST 610 and NMNH 107667 were used to compute an intercalibration fractionation factor (FFNMNH-610) between glass and scheelite for the experimental protocol (Wintzer et al., 2020). We found this fractionation factor to be of consistent magnitude across numerous experiments. Twelve experiments produced a weighted mean value of 1.327 ± 0.022 that was subsequently applied to correct all earlier experiments calibrated to the NIST 610 glass standard, via the equation found in Wintzer (2019). We note that scheelite is anomalous compared with other accessory minerals in that transport and effective ionization of U is substantially favored over Pb during laser-induced fractionation (Eggins et al., 1998).
Sm-Nd scheelite geochronology was performed on the NMNH 107667 sample for a link between the relatively more common Sm-Nd scheelite method and the newer U-Pb scheelite approach. Scheelite is documented to resist complete dissolution (e.g., Chu et al., 2012), so concentrated 12 M HCl was used to dissolve six 150 mg fractions (A, B1, B2, C, D, and E) of medium to fine scheelite from NMNH 107667. Sample fractions were placed in Savillex bombs with steel jackets, put in a 160 °C oven, and allowed to dissolve for 42 hours. The resulting solutions were diluted 6 times to 2 M HCl resulting in precipitation of a light yellow solid, and samples were centrifuged allowing the supernatant to be pipetted out. Precipitation is not thought to affect either the Nd isotope composition or the Sm/Nd ratios. A mixed Sm-Nd spike was added to the supernatants based on the sample Sm and Nd concentrations, and spiked samples were allowed to equilibrate overnight on a 100 °C hotplate. Samples were loaded in 2 M HCl onto columns with AG50-X8 cation exchange resin, washed with 80 ml of 2.5 HCl, and Sm-Nd were eluted together with 50 ml of 6M HCl. A second set of columns, these with LN-spec resin, separated and purified Sm and Nd. Nd was eluted with 34 ml 0.14 M HCl, and Sm was eluted with 10 ml of 0.4 M HCl. Separate Sm and Nd cuts from each sample were measured on a Neptune Plus multi-collector inductively coupled mass spectrometer at the Radiogenic Isotope and Geochronology Laboratory at Washington State University. Resulting isotopic ratios were reduced with in-house Excel data reduction workbooks and IsoplotR was used for isochron plotting.
References Cited
Chew, D.M., Petrus, J.A., Kamber, B.S., 2014, U–Pb LA–ICPMS dating using accessory mineral standards with variable common Pb: Chemical Geology, v. 363, p. 185–199.
Chu, Z.Y., Guo, J.H., Yang, Y.H., Qi, L., Chen, L., Li, X.C., Gao, J.F., 2012, Evaluation of sample dissolution method for Sm-Nd isotopic analysis of scheelite: The Journal of Analytical Atomic Spectrometry, v. 27, p. 509–515.
Condon, D.J., Schoene, B., McLean, N.M., Bowring, S.A., Parrish, R.R., 2015, Metrology and traceability of U–Pb isotope dilution geochronology (EARTHTIME Tracer Calibration Part I): Geochimica et Cosmochimica Acta, v. 164, p. 464–480.
Eggins, S.M., Kinsley, L., Shelley, J.M.G., 1998, Deposition and element fractionation processes during atmospheric pressure laser sampling for analysis by ICP-MS: Applied Surface Science, v. 127-129, p. 278–286.
Gerstenberger, H., Haase, G., 1997, A highly effective emitter substance for mass spectrometric Pb isotope ratio determinations: Chemical Geology, v. 136, p. 309–312.
Horstwood, M.S.A., Košler, J., Gehrels, G., Jackson, S.E., McLean, N.M., Paton, C., Pearson, N.J., Sircombe, K., Sylvester, P., Vermeesch, P., Bowring, J.F., Condon, D.J., and Schoene, B., 2016, Community-Derived standards for LA-ICP-MS U-(Th-)Pb geochronology—uncertainty propagation, age interpretation and data reporting: Geostandards and Geoanalytical Research, v. 40, p. 311–332.
Jaffey, A.H., Flynn, K.F., Glendenin, L.E., Bentley, W.T., Essling, A.M., 1971, Precision measurement of half-lives and specific activities of 235U and 238U: Physical Review C, v. 4, p. 1889–1906.
Ludwig, K.R., 1998, On the treatment of concordant uranium-lead ages: Geochimica et Cosmochimica Acta, v. 62, p. 665–676.
Ludwig, K.R., 2003, User’s manual for Isoplot 3.00—a geochronological toolkit for Microsoft Excel: Berkeley Geochronology Center Special Publication 4, 71 p.
McLean, N.M., Condon, D.J., Schoene, B., Bowring, S.A., 2015, Evaluating uncertainties in the calibration of isotopic reference materials and multi-element isotopic tracers (EARTHTIME Tracer Calibration Part II): Geochimica et Cosmochimica Acta, v. 164, p. 481–501.
Schmitz, M.D., and Schoene, B., 2007, Derivation of isotope ratios, errors, and error correlations for U‐Pb geochronology using 205Pb‐235U‐(233U)‐spiked isotope dilution thermal ionization mass spectrometric data: Geochemistry, Geophysics, Geosystems, v. 8, p. 1–20, (https://doi.org/10.1029/2006GC001492).
Tera, F. and Wasserburg, G.J., 1972, U-Th-Pb systematics in three Apollo 14 basalts and the problem of initial lead in lunar rocks. Earth and Planetary Science Letters, v. 14, p. 281–304.
Wintzer, N.E., 2019, Geology, geochronology, and geochemistry of the Stibnite-Yellow Pine gold-antimony-tungsten mining area, Idaho: PhD thesis, Pullman, Washington, Washington State University, 282 p.
20150206
Sm-Nd Scheelite Data Summary.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
NMNH_107667
Sample fraction of NMNH 107667
Producer Defined
A
Fraction A of NMNH 107667
Producer defined
B1
Fraction B of NMNH 107667 that was split into two sub fractions, and this is the first sub fraction.
Producer defined
B2
Fraction B of NMNH 107667 that was split into two sub fractions, and this is the second sub fraction.
Producer defined
C
Fraction C of NMNH 107667.
Producer defined
D
Fraction D of NMNH 107667
Producer defined
E
Fraction E of NMNH 107667
Producer defined
143Nd/144Nd and Epsilon Nd initial uncertainty is 1 sigma.
Footnote about uncertainty reporting
Producer defined
Sm_ppm
Concentration of elemental Samarium in sample reported as parts per million (ppm)
Producer Defined
< 2.56
Concentration of Sm in fraction A
Producer defined
< 4.18
Concentration of Sm in fraction B1
Producer defined
< 3.10
Concentration of Sm in fraction B2
Producer defined
< 1.01
Concentration of Sm in fraction C
Producer defined
< 5.39
Concentration of Sm in fraction D
Producer defined
< 5.59
Concentration of Sm in fraction E
Producer defined
Nd_ppm
Concentration of elemental Neodymium in sample reported as parts per million (ppm)
Producer Defined
< 6.40
Concentration of Nd in fraction A
Producer defined
< 10.6
Concentration of Nd in fraction B1
Producer defined
< 8.52
Concentration of Nd in fraction B2
Producer defined
< 3.61
Concentration of Nd in fraction C
Producer defined
< 15.2
Concentration of Nd in fraction D
Producer defined
< 16.5
Concentration of Nd in fraction E
Producer defined
147Sm/144Nd
Ratio of 147 Samarium over stable isotope 144 Neodymium
Producer Defined
0.1689
0.2416
ratios are unitless
143Nd/144Nd
Ratio of radioactive 143 Neodymium over stable isotope 144 Neodymium
Producer Defined
0.512249
0.512282
ratios are unitless
±143Nd/144Nd
Uncertainty range is 1 standard deviation for ratio of radioactive 143 Neodymium over stable isotope 144 Neodymium
Producer Defined
±6
Range of 143Nd/144Nd uncertainty for the fraction
Producer defined
±7
Range of 143Nd/144Nd uncertainty for the fraction
Producer defined
±5
Range of 143Nd/144Nd uncertainty for the fraction
Producer defined
143Nd/144Nd_initial
Calculated 143 Neodymium to 144 Neodymium at the time of extraction, also known as initial
Producer Defined
0.51217
0.512196
ratios are unitless
eNd(today)
Epsilon Neodymium value for today
Producer Defined
-7.4
-6.8
eNd(initial)
Epsilon Neodymium calculated for time of extraction or initial
Producer Defined
-7.5
-7.0
±1eNd(initial)
Uncertainty range is 1 standard deviation for Epsilon Neodymium initial
Producer Defined
±1.2
Range of epsilon Nd initial uncertainty for the fraction
Producer defined
±1.1
Range of epsilon Nd initial uncertainty for the fraction
Producer defined
±1.3
Range of epsilon Nd initial uncertainty for the fraction
Producer defined
±1.0
Range of epsilon Nd initial uncertainty for the fraction
Producer defined
U-Pb Scheelite Ages Summary.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
Sample_ID
Sample identification number. There are multiple numbering schemes, because these samples are from more than one geologist.
Producer Defined
MGI-12145-436
Scheelite sample collected from drill core number MGI-12-145 at a down-hole depth of 436 feet by Peter Vikre
Producer defined
6GE-005
Scheelite sample collected by Virginia S. Gillerman
Producer defined
6RJ-013
Scheelite sample collected by Virginia S. Gillerman
Producer defined
6EW-002
Scheelite sample collected by Virginia S. Gillerman
Producer defined
NMNH-107667
Scheelite sample borrowed from the National Museum of Natural History
Producer defined
8EB-002
Scheelite sample collected by Virginia S. Gillerman
Producer defined
NW12234-314
Scheelite sample collected from drill core number MGI-12-234 at a down-hole depth of 314 feet by Niki E. Wintzer
Producer defined
NW12234-314B
Scheelite sample collected from drill core number MGI-12-234 at a down-hole depth of 314 feet by Niki E. Wintzer. The "B" in this name indicates a second thin section made from the same thick section.
Producer defined
Age is computed in Tera-Wasserburg space from the Semi-Total Pb (LA-ICPMS) or Total Pb (ID-TIMS) intercept algorithms of Ludwig (2008).
Footnote about age calculations
Producer defined
External error for ID-TIMS ages includes excess regression scatter as: 95% conf. int. = s * Student's T * (MSWD)^0.5.
Footnote about error/uncertainty calculations
Producer defined
Deposit
Two deposits within the Stibnite-Yellow Pine mining area were sampled from: the northern Yellow Pine pit and the southern Hangar Flats deposits, both of which are along the Meadow Creek fault.
Producer Defined
Yellow Pine
Northern deposit of the two along the Meadow Creek fault.
Producer defined
Hangar Flats
Southern deposit of the two along the Meadow Creek fault.
Producer defined
Lat
Latitude of sample at ground surface, not adjusted for down-hole depth for drill core samples.
Producer Defined
44.89928
44.92818
decimal degrees
Long
Longitude of sample at ground surface, not adjusted for down-hole depth for drill core samples.
Producer Defined
-115.3385
-115.32322
decimal degrees
Type
Scheelite type categories that are based on morphology: Type 1 is moderately bright (in shortwave UV light) scheelite as subangular clasts in mostly matrix-supported breccia from the micron to centimeter scale, but some Type 1 scheelite occurs in veins. Type 2 is brighter, disseminated, and forms necklace-like trains of euhedral to subhedral scheelite grains some of which are oscillatory zoned. Type 3 is subhedral scheelite in veins with stibnite and as euhedral scheelite crystals filling vugs with stibnite.
Producer Defined
Type 1
Type 1 is moderately bright (in shortwave UV light) scheelite as subangular clasts in mostly matrix-supported breccia from the micron to centimeter scale, but some Type 1 scheelite occurs in veins.
Producer defined
Type 3
Type 3 is subhedral scheelite in veins with stibnite and as euhedral scheelite crystals filling vugs with stibnite.
Producer defined
Type 2&3
Type 2 is brighter, disseminated, and forms necklace-like trains of euhedral to subhedral scheelite grains some of which are oscillatory zoned. Type 3 is subhedral scheelite in veins with stibnite and as euhedral scheelite crystals filling vugs with stibnite.
Producer defined
Calibration
Approach used to provide a matrix matched standard or compensate for lack of matrix matched standard.
Producer Defined
FFNMNH/FF610
Fractionation factor between NIST 610 glass and the NMNH 107667 sample used for calibration
Producer defined
ID-TIMS
Liquid spike during isotope dilution used for calibration
Producer defined
direct
NMNH 107667 used as matrix-matched standard
Producer defined
207Pb/206Pb_initial
Calculated initial ratio of 207 Lead over 206 Lead
Producer Defined
0.757
0.805
Ratios are unitless
±1_207Pb/206Pb_initial
Uncertainty range for calculated initial ratio of 207 Lead over 206 Lead reported as 1 sigma
Producer Defined
0.0014
0.02
Ratios are unitless
Age_Ma
Age in millions of years, mega annum, Ma
Producer Defined
45.8
61.3
Millions of years
internal_95%ci
Confidence interval of age in mega annum at 95%, for non-ID-TIMS analyses
Producer Defined
nd
no data
Producer defined
2.8
95% confidence interval of age for MGI-12145-436 and 6RJ-013
Producer defined
1.3
95% confidence interval of age for 6GE-005
Producer defined
2
95% confidence interval of age for 6RJ-013
Producer defined
1.1
95% confidence interval of age for 6EW-002
Producer defined
1.5
95% confidence interval of age for 6EW-002
Producer defined
0.4
95% confidence interval of age for NMNH-107667
Producer defined
2.1
95% confidence interval of age for 8EB-002
Producer defined
3.1
95% confidence interval of age for NW12234-314
Producer defined
3
95% confidence interval of age for NW12234-314B
Producer defined
1.8
95% confidence interval of age for 6EW-002
Producer defined
external
External uncertainty range for age reported in millions of years, mega annum
Producer Defined
0.16
5.3
Millions of years
MSWD
MSWD stands for mean square of weighted deviates that tests the statistical goodness of fit
Producer Defined
1.7
88.0
n
Number of analyses spots included in each calculated age
Producer Defined
6
49
U-Pb Scheelite Fractionation Factor Data.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
Sample_Analysis
Name of sample analyzed including: sample name, ascending spot number, and date with time of measurement.
Producer Defined
Name of sample analyzed including: sample name, ascending spot number, and date with time of measurement. Here is an example: NMNH-107667-00a_10 2/15/2017 9:57:37 AM (Run: 1). Each block of analyses are organized by date and sample For example, the10th of April in 2018 had 6 analysis sets and are numbered 10Apr18_1 through 10Apr18_6.
Phase
Material type analyzed that was either standard glass or scheelite
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
scheelite
Scheelite is a calcium tungstate mineral with the chemical formula of CaWO4.
Producer defined
glass
NIST 610 is the glass standard used for these experiments.
Producer defined
U_ppm
Concentration of elemental Uranium in parts per million
Producer Defined
Th_ppm
Concentration of elemental Thorium in parts per million
Producer Defined
Pb_ppm
Concentration of elemental Lead in parts per million
Producer Defined
207Pb*/235U*
Ratio of radiogenic 207 Lead over by radiogenic 235 Uranium
Producer Defined
±2s(%)_207Pb*/235U*
Uncertainty for ratio of radiogenic 207 Lead over by radiogenic 235 Uranium as 2 standard deviations, sigma
Producer Defined
<< empty cell >>
No Data
Producer defined
206Pb*/238U
Ratio of radiogenic 206 Lead to 238 Uranium
Producer Defined
±2s(%)_206Pb*/238U
Uncertainty for ratio of radiogenic 206 Lead to 238 Uranium as 2 standard deviations, sigma
Producer Defined
error_corr.
Uncertainty (error) corrected value
Producer Defined
238U/206Pb*
Ratio of 238 Uranium to radiogenic 206 Lead
Producer Defined
±2s(%)_238U/206Pb*
Uncertainty for ratio of 238 Uranium to radiogenic 206 Lead as 2 standard deviations, sigma
Producer Defined
207Pb*/206Pb*
Ratio of radiogenic 207 Lead to radiogenic 206 Lead
Producer Defined
±2s(%)_207Pb*/206Pb*
Uncertainty for ratio of radiogenic 207 Lead to radiogenic 206 Lead as 2 standard deviations, sigma
Producer Defined
SpotDate_206Pb*/238U*
Age is millions of years based on radiogenic 206 Lead to radiogenic 238 Uranium from one spot analysis
Producer Defined
±2s(Ma)__206Pb*/238U*
Uncertainty is 2 standard deviations, sigma, in millions of years
Producer Defined
P_ppm
Concentration of elemental Phosphorous in parts per million
Producer Defined
Sr_ppm
Concentration of elemental Strontium in parts per million
Producer Defined
Y_ppm
Concentration of elemental Yttrium in parts per million
Producer Defined
Mo_ppm
Concentration of elemental Molybdenum in parts per million
Producer Defined
Sn_ppm
Concentration of elemental Tin in parts per million
Producer Defined
La_ppm
Concentration of elemental Lanthanum in parts per million
Producer Defined
Ce_ppm
Concentration of elemental Cerium in parts per million
Producer Defined
Pr_ppm
Concentration of elemental Praseodymium in parts per million
Producer Defined
Nd_ppm
Concentration of elemental Neodymium in parts per million
Producer Defined
Sm_ppm
Concentration of elemental Samarium in parts per million
Producer Defined
Eu_ppm
Concentration of elemental Europium in parts per million
Producer Defined
Gd_ppm
Concentration of elemental Gadolinium in parts per million
Producer Defined
Tb_ppm
Concentration of elemental Terbium in parts per million
Producer Defined
Dy_ppm
Concentration of elemental Dysprosium in parts per million
Producer Defined
Ho_ppm
Concentration of elemental Holmium in parts per million
Producer Defined
Er_ppm
Concentration of elemental Erbium in parts per million
Producer Defined
Tm_ppm
Concentration of elemental Thulium in parts per million
Producer Defined
Yb_ppm
Concentration of elemental Ytterbium in parts per million
Producer Defined
Lu_ppm
Concentration of elemental Lutetium in parts per million
Producer Defined
Th_ppm
Concentration of elemental Thorium in parts per million
Producer Defined
U_ppm
Concentration of elemental Uranium in parts per million
Producer Defined
U-Pb Scheelite Fractionation Factor Ratios.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
Experiment_Date
Date of experiment reported as day, month, year
Producer Defined
15Feb17_1
February 15th, 2017 and this is the first and only relevant data from that date.
Producer defined
10Apr18_1
April 10th, 2018 and this is the first of six relevant data sets from that date.
Producer defined
10Apr18_2
April 10th, 2018 and this is the second of six relevant data sets from that date.
Producer defined
10Apr18_3
April 10th, 2018 and this is the third of six relevant data sets from that date.
Producer defined
10Apr18_4
April 10th, 2018 and this is the fourth of six relevant data sets from that date.
Producer defined
10Apr18_5
April 10th, 2018 and this is the fifth of six relevant data sets from that date.
Producer defined
10Apr18_6
April 10th, 2018 and this is the sixth of six relevant data sets from that date.
Producer defined
11Apr18_1
April 11th, 2018 and this is the first of five relevant data sets from that date.
Producer defined
11Apr18_2
April 11th, 2018 and this is the second of five relevant data sets from that date.
Producer defined
11Apr18_3
April 11th, 2018 and this is the third of five relevant data sets from that date.
Producer defined
11Apr18_4
April 11th, 2018 and this is the fourth of five relevant data sets from that date.
Producer defined
11Apr18_5
April 11th, 2018 and this is the fifth of five relevant data sets from that date.
Producer defined
FF - fractionation factor, computed as (206Pb/238U)true / (206Pb/238U)measured.
Footnote about how the fractionation factor was computed
Producer defined
FF_NMNH
Fractionation factor for sample NMNH 107667, computed as (206Pb/238U)true / (206Pb/238U)measured.
Producer Defined
1.063
1.44
±1s_FF_NMNH
Uncertainty fractionation factor for sample NMNH 107667 as 1 standard deviation
Producer Defined
± 0.025
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.072
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.065
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.052
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.071
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.069
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.090
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.111
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.080
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.074
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.082
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.083
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
FF_610
Fractionation factor for NIST 610 glass standard
Producer Defined
0.839
1.062
±1s_FF_610
Uncertainty range for fractionation factor from 610 NIST glass standard reported as plus or minus one sigma
Producer Defined
± 0.031
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.020
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.015
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.014
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.012
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.018
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.017
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.019
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.025
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
Weighted Mean:
The cell to the right of this one reports the weighted mean of all fractionation factor ratios, which is 1.327 ± 0.022
Producer defined
FF_ratio
Fractionation factor between NMNH 107667 and NIST 610 glass standard
Producer Defined
1.268
1.365
±1s_FF_ratio
Uncertainty range for fractionation factor from the NMNH 107667 sample over the fractionation factor from NIST 610 glass reported as plus or minus one sigma
Producer Defined
± 0.043
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.055
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.047
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.041
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.056
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.052
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.068
Producer defined
± 0.080
Producer defined
± 0.060
Producer defined
± 0.057
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.064
Uncertainty range reported as plus or minus one sigma for the specified experiment
Producer defined
± 0.022
Uncertainty range reported as plus or minus one sigma for the weighted mean
Producer defined
U-Pb Scheelite ICPMS Instrument Data.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
Analytical metadata for LA-ICP-MS U-(Th-)Pb and trace element concentration data
Metadata are within these categories: Laboratory and Sample Preparation; Laser Ablation System; ICP-MS Instrument; and Data Processing
Producer Defined
Analytical parameters specified within each category:
Laboratory and Sample Preparation Details Reported
Laboratory name
Sample type/mineral
Sample preparation
Imaging
Laser ablation system
Make, Model and type
Ablation cell and volume
Laser wavelength (nm)
Pulse width (ns)
Fluence (J cm-2)
Repetition rate (Hz)
Ablation duration (s)
Ablation pit depth / ablation rate
Spot diameter (mm)
Sampling mode / pattern
Carrier gas
Cell carrier gas flow (l min-1)
ICP-MS Instrument
Make, Model and type
Sample introduction
RF power (W)
Make-up gas flow (l min-1)
Detection system
Masses measured
Integration time per peak/dwell times (ms)
Quadrupole settling time between mass jumps
Total integration time per output data point (s)
‘Sensitivity’ as useful yield (%, element)
IC Dead time (ns)
Data Processing
Gas blank
Calibration strategy
Reference Material info
Data processing package used / Correction for LIEF
Mass discrimination
Common-Pb correction, composition and uncertainty
Uncertainty level and propagation
Descriptions and analytical parameters
Metadata are within these categories: Laboratory and Sample Preparation; Laser Ablation System; ICP-MS Instrument; and Data Processing
Producer Defined
Name of laboratory where analyses were run and data were reduce
Material analyzed, which was either scheelite, stibnite, or glass
Thin sections for unknowns; co-located standards in 1 cm resin mount, 0.3 mm polish to finish
CL, JEOL T300, 10 nA, 17 mm working distance
Details about laser ablation system: Make, Model, type, ablation cell and volume, laser wavelength, pulse width, fluence, repetition rate, ablation duration, ablation pit depth / ablation rate, spot diameter, sampling mode / pattern, carrier gas, and cell carrier gas flow
ESI/New Wave Research, UP213
Standard ablation cell
213 nm
4 ns
~5 J cm-2
5 Hz
30 s
30 mm pit depth, measured using an optical microscope, equivalent to 0.2 mm/pulse
80 mm
Static spot ablation
100% He in the cell, Ar make-up gas combined using a Y-piece 30 cm from the torch.
1.15 l min-1
Details about ICP-MS instrument: Make, Model and type, sample introduction, RF power, Make-up gas flow, Detection system, Masses measured, Integration time per peak/dwell times, settling time between mass jumps, Total integration time per output data point(s), sensitivity as useful yield, and IC Dead time
Company name, particular instrument name, and general type:
Ablation aerosol transported through 120 cm long coil of 1.5 cm dia. tygon tubing
1400 W
0.74 l min-1 Ar
single ion-counting SEM
29Si, 31P, 43Ca, 88Sr, 89Y, 95Mo, 118Sn, 139La, 140Ce, 141Pr, 146Nd, 147Sm, 153Eu, 157Gd, 159Tb, 163Dy, 165Ho, 166Er, 169Tm, 172Yb, 175Lu, 202Hg, 204Hg, 206Pb, 207Pb, 208Pb, 232Th, 238U
2 (Si,P); 5 (Sr,Y,Mo,Sn); 10(REE); 1(202Hg,204Hg); 150(206Pb,207Pb); 80(208Pb); 20(232Th); 40(238U)
dynamically set from 0.1 ms minimum
0.689 s
0.04%U; ((#ions detected/#atoms sampled)*100; Schaltegger et al. 2015)
29 ns
Details about processing the data: Gas blank, Salibration strategy, Reference Material info, Data processing package used / Correction for IEF, Mass discrimination, Common-Pb correction, composition and uncertainty, and Uncertainty level and propagation
15 s on-peak zero subtracted
43Ca as internal standard; NIST 610 and/or Yellowpine Smithsonian scheelite as primary reference materials
Jochum et al., 2011; Woodhead and Hergt, 2007
ThermoElectron Plasmalab TRA software for integrated cps acquisition; in-house Microsoft VBA coded spreadsheet for data normalization, concentration calibration, uncertainty propagation and age calculation.
207Pb/206Pb and 206Pb/238U normalized to reference material
No common-Pb correction applied to the isotope ratios; '207Pb-corrected' ages calculated using the Pb isotope ratios of coexisting stibnite measured in the same thin section
Ages are quoted at 2s absolute, propagation is by quadratic addition. Reproducibility and age uncertainty of reference material are propagated as external error.
U-Pb Scheelite ICPMS Sample Data.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
Sample_Analysis
Name of sample analyzed including: sample name, ascending spot number, and date with time of measurement.
Producer Defined
Name of sample analyzed including: sample name, ascending spot number, and date with time of measurement. Here is an example: MGI-12-145-436_32 2/14/2017 2:35:07 PM. Each block of analyses are labeled with and separated by sample identification, scheelite type, deposit, and year. For example, MGI-12-145-436 Type 1 (Yellow Pine) 2017 Experiment.
Phase
Phase refers to mineral, which here is scheelite, stibnite, pyrite, or arsenopyrite.
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
scheelite
Scheelite is a calcium tungstate mineral with the chemical formula of CaWO4.
Producer defined
stibnite
Stibnite is an antimony sulfide with the chemical formula Sb2S3.
Producer defined
pyrite
Pyrite is an iron sulfide with the chemical formula FeS.
Producer defined
arsenopyrite
Arsenopyrite is an iron arsenic sulfide with the chemical formula FeAsS.
Producer defined
U_ppm
Concentration of elemental uranium in parts per million
Producer Defined
Th_ppm
Concentration of elemental Thorium in parts per million
Producer Defined
Pb_ppm
Concentration of elemental Lead in parts per million
Producer Defined
207Pb*/235U*
Ratio of radiogenic 207 Lead over by radiogenic 235 Uranium
Producer Defined
±2s(%)_207Pb*/235U*
Uncertainty for ratio of radiogenic 207 Lead over by radiogenic 235 Uranium as 2 standard deviations, sigma
Producer Defined
206Pb*/238U
Ratio of radiogenic 206 Lead to 238 Uranium
Producer Defined
±2s(%)_206Pb*/238U
Uncertainty for ratio of radiogenic 206 Lead to 238 Uranium as 2 standard deviations, sigma
Producer Defined
error_corr.
Uncertainty (error) corrected value
Producer Defined
238U/206Pb*
Ratio of 238 Uranium to radiogenic 206 Lead
Producer Defined
±2s(%)_238U/206Pb*
Uncertainty for ratio of 238 Uranium to radiogenic 206 Lead as 2 standard deviations, sigma
Producer Defined
207Pb*/206Pb*
Ratio of radiogenic 207 Lead to radiogenic 206 Lead
Producer Defined
±2s(%)_207Pb*/206Pb*
Uncertainty for ratio of radiogenic 207 Lead to radiogenic 206 Lead as 2 standard deviations, sigma
Producer Defined
206Pb*/238U*_SpotDate
Age is millions of years based on radiogenic 206 Lead to radiogenic 238 Uranium from one spot analysis
Producer Defined
±2s(Ma)_206Pb*/238U*_SpotDate
Uncertainty is 2 standard deviations, sigma, in millions of years
Producer Defined
P_ppm
Concentration of elemental Phosphorous in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
Sr_ppm
Concentration of elemental Strontium in parts per million
Producer Defined
Y_ppm
Concentration of elemental Yttrium in parts per million
Producer Defined
Mo_ppm
Concentration of elemental Molybdenum in parts per million
Producer Defined
Sn_ppm
Concentration of elemental Tin in parts per million
Producer Defined
La_ppm
Concentration of elemental Lanthanum in parts per million
Producer Defined
Ce_ppm
Concentration of elemental Cerium in parts per million
Producer Defined
Pr_ppm
Concentration of elemental Praseodymium in parts per million
Producer Defined
Nd_ppm
Concentration of elemental Neodymium in parts per million
Producer Defined
Sm_ppm
Concentration of elemental Samarium in parts per million
Producer Defined
Eu_ppm
Concentration of elemental Europium in parts per million
Producer Defined
Gd_ppm
Concentration of elemental Gadolinium in parts per million
Producer Defined
Tb_ppm
Concentration of elemental Terbium in parts per million
Producer Defined
Dy_ppm
Concentration of elemental Dysprosium in parts per million
Producer Defined
Ho_ppm
Concentration of elemental Holmium in parts per million
Producer Defined
Er_ppm
Concentration of elemental Erbium in parts per million
Producer Defined
Tm_ppm
Concentration of elemental Thulium in parts per million
Producer Defined
Yb_ppm
Concentration of elemental Ytterbium in parts per million
Producer Defined
Lu_ppm
Concentration of elemental Lutetium in parts per million
Producer Defined
Th_ppm
Concentration of elemental Thorium in parts per million
Producer Defined
U_ppm
Concentration of elemental Uranium in parts per million
Producer Defined
U-Pb Scheelite ICPMS Standard Data.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
Sample_Analysis
Name of sample analyzed including: sample name, ascending spot number, and date with time of measurement.
Producer Defined
Here is an example: NMNH2_1_24 4/14/2019 4:54:59 PM. Each block of analyses are labeled with and separated by standard identification, date, and time.
Phase
Phase refers to mineral or standard type, which here is either scheelite or glass.
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
glass
NIST 610 is the glass standard used for these experiments.
Producer defined
scheelite
Scheelite is a calcium tungstate mineral with the chemical formula of CaWO4.
Producer defined
U_ppm
Concentration of elemental Uranium in parts per million
Producer Defined
Th_ppm
Concentration of elemental Thorium in parts per million
Producer Defined
Pb_ppm
Concentration of elemental Lead in parts per million
Producer Defined
207Pb*/235U*
Ratio of radiogenic 207 Lead over by radiogenic 235 Uranium
Producer Defined
±2s(%)_207Pb*/235U*
Uncertainty for ratio of radiogenic 207 Lead over by radiogenic 235 Uranium as 2 standard deviations, sigma
Producer Defined
206Pb*/238U
Ratio of radiogenic 206 Lead to 238 Uranium
Producer Defined
±2s(%)_206Pb*/238U
Uncertainty for ratio of radiogenic 206 Lead to 238 Uranium as 2 standard deviations, sigma
Producer Defined
error_corr.
Uncertainty (error) corrected value
Producer Defined
238U/206Pb*
Ratio of 238 Uranium to radiogenic 206 Lead
Producer Defined
±2s(%)_238U/206Pb*
Uncertainty for ratio of 238 Uranium to radiogenic 206 Lead as 2 standard deviations, sigma
Producer Defined
207Pb*/206Pb*
Ratio of radiogenic 207 Lead to radiogenic 206 Lead
Producer Defined
±2s(%)_207Pb*/206Pb*
Uncertainty for ratio of radiogenic 207 Lead to radiogenic 206 Lead as 2 standard deviations, sigma
Producer Defined
206Pb*/238U*_SpotDate
Age is millions of years based on radiogenic 206 Lead to radiogenic 238 Uranium from one spot analysis
Producer Defined
±2s(Ma)_206Pb*/238U*_SpotDate
Uncertainty is 2 standard deviations, sigma, in millions of years
Producer Defined
P_ppm
Concentration of elemental Phosphorous in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
Sr_ppm
Concentration of elemental Strontium in parts per million
Producer Defined
Y_ppm
Concentration of elemental Yttrium in parts per million
Producer Defined
Mo_ppm
Concentration of elemental Molybdenum in parts per million
Producer Defined
Sn_ppm
Concentration of elemental Tin in parts per million
Producer Defined
La_ppm
Concentration of elemental Lanthanum in parts per million
Producer Defined
Ce_ppm
Concentration of elemental Cerium in parts per million
Producer Defined
Pr_ppm
Concentration of elemental Praseodymium in parts per million
Producer Defined
Nd_ppm
Concentration of elemental Neodymium in parts per million
Producer Defined
Sm_ppm
Concentration of elemental Samarium in parts per million
Producer Defined
Eu_ppm
Concentration of elemental Europium in parts per million
Producer Defined
Gd_ppm
Concentration of elemental Gadolinium in parts per million
Producer Defined
Tb_ppm
Concentration of elemental Terbium in parts per million
Producer Defined
Dy_ppm
Concentration of elemental Dysprosium in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
Ho_ppm
Concentration of elemental Holmium in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
Er_ppm
Concentration of elemental Erbium in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
Tm_ppm
Concentration of elemental Thulium in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
Yb_ppm
Concentration of elemental Ytterbium in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
Lu_ppm
Concentration of elemental Lutetium in parts per million
Producer Defined
Th_ppm
Concentration of elemental Thorium in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
U_ppm
Concentration of elemental Uranium in parts per million
Producer Defined
<< empty cell >>
No Data
Producer defined
U-Pb Scheelite TIMS Sample Data.csv
Comma Separated Value (CSV) file containing data.
Producer Defined
Sample
Alpha numeric identification for analyses of fragments from same crystal. sch1, sch2 etc. are labels for single scheelite grain fragments spiked and dissolved for ID-TIMS analysis. Letter-number combinations are replicate analyses of fragments from same crystal.
Producer Defined
6GE-005 (Hangar Flats) and NMNH 107667 (Yellow Pine) are the two samples that were analyzed.
Th/U
Ratio of Thorium to Uranium
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(b)
Footnote reference: (b) Model Th/U ratio iteratively calculated from the radiogenic 208Pb/206Pb ratio and 206Pb/238U age.
Producer defined
0.74
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.096
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.23
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.594
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.951
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.288
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.148
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.346
Ratio value of Thorium to Uranium that is unitless
Producer defined
1.973
Ratio value of Thorium to Uranium that is unitless
Producer defined
2.008
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.938
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.917
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.578
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.152
Ratio value of Thorium to Uranium that is unitless
Producer defined
2.644
Ratio value of Thorium to Uranium that is unitless
Producer defined
0.923
Ratio value of Thorium to Uranium that is unitless
Producer defined
4.082
Ratio value of Thorium to Uranium that is unitless
Producer defined
206Pb*
Radiogenic 206 Lead
Producer Defined
mol%_206Pb*
Mole percent radiogenic 206 Lead with respect to radiogenic, blank and initial common Lead.
Producer Defined
Pb*/Pbc
Measured ratio of radiogenic Lead to common Lead corrected for spike and fractionation only.
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(c)
Footnote reference: (c) Pb* and Pbc represent radiogenic and common Pb, respectively; mol % 206Pb* with respect to radiogenic, blank and initial common Pb.
Producer defined
0.21
Measured ratio of radiogenic Lead to common Lead
Producer defined
1.32
Measured ratio of radiogenic Lead to common Lead
Producer defined
0.53
Measured ratio of radiogenic Lead to common Lead
Producer defined
0.2
Measured ratio of radiogenic Lead to common Lead
Producer defined
0.15
Measured ratio of radiogenic Lead to common Lead
Producer defined
0.8
Measured ratio of radiogenic Lead to common Lead
Producer defined
1.72
Measured ratio of radiogenic Lead to common Lead
Producer defined
0.77
Measured ratio of radiogenic Lead to common Lead
Producer defined
1.21
Measured ratio of radiogenic Lead to common Lead
Producer defined
2.02
Measured ratio of radiogenic Lead to common Lead
Producer defined
3.12
Measured ratio of radiogenic Lead to common Lead
Producer defined
9.69
Measured ratio of radiogenic Lead to common Lead
Producer defined
0.98
Measured ratio of radiogenic Lead to common Lead
Producer defined
2.09
Measured ratio of radiogenic Lead to common Lead
Producer defined
0.84
Measured ratio of radiogenic Lead to common Lead
Producer defined
Pbc(pg)
Common lead in picograms
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(c)
Footnote reference: (c) Pb* and Pbc represent radiogenic and common Pb, respectively; mol % 206Pb* with respect to radiogenic, blank and initial common Pb.
Producer defined
45.86
Common lead in picograms
Producer defined
32.61
Common lead in picograms
Producer defined
46.95
Common lead in picograms
Producer defined
40.96
Common lead in picograms
Producer defined
125.71
Common lead in picograms
Producer defined
17.2
Common lead in picograms
Producer defined
17.15
Common lead in picograms
Producer defined
19.46
Common lead in picograms
Producer defined
78.28
Common lead in picograms
Producer defined
65.71
Common lead in picograms
Producer defined
26.84
Common lead in picograms
Producer defined
11.84
Common lead in picograms
Producer defined
48.24
Common lead in picograms
Producer defined
6.61
Common lead in picograms
Producer defined
40.56
Common lead in picograms
Producer defined
34.42
Common lead in picograms
Producer defined
58.77
Common lead in picograms
Producer defined
206Pb/204Pb
Measured ratio of 206 Lead to 204 Lead, which is unitless, corrected for spike and fractionation only.
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(d)
Footnote reference: (d) Measured ratio corrected for spike and fractionation only. Fractionation estimated at 0.17 +/- 0.03 %/a.m.u. for Daly analyses, based on analysis of NBS-981 and NBS-982.
Producer defined
32
Measured ratio of 206 Lead to 204 Lead
Producer defined
113
Measured ratio of 206 Lead to 204 Lead
Producer defined
56
Measured ratio of 206 Lead to 204 Lead
Producer defined
29
Measured ratio of 206 Lead to 204 Lead
Producer defined
73
Measured ratio of 206 Lead to 204 Lead
Producer defined
139
Measured ratio of 206 Lead to 204 Lead
Producer defined
71
Measured ratio of 206 Lead to 204 Lead
Producer defined
57
Measured ratio of 206 Lead to 204 Lead
Producer defined
98
Measured ratio of 206 Lead to 204 Lead
Producer defined
99
Measured ratio of 206 Lead to 204 Lead
Producer defined
152
Measured ratio of 206 Lead to 204 Lead
Producer defined
492
Measured ratio of 206 Lead to 204 Lead
Producer defined
47
Measured ratio of 206 Lead to 204 Lead
Producer defined
101
Measured ratio of 206 Lead to 204 Lead
Producer defined
38
Measured ratio of 206 Lead to 204 Lead
Producer defined
208Pb/206Pb
Measured ratio of 208 Lead to 206 Lead, which is unitless, corrected for fractionation, spike, and common Lead.
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(e)
Footnote reference: (e) Corrected for fractionation, spike, and common Pb; up to 0.5 pg of common Pb was assumed to be procedural blank: 206Pb/204Pb = 18.042 ± 0.61%; 207Pb/204Pb = 15.537 ± 0.52%; 208Pb/204Pb = 37.686 ± 0.63% (all uncertainties 1-sigma). Remaining initial common Pb was assigned a composition based upon the Total Pb regression of Ludwig (2008): (6GE-005) 206Pb/204Pb = 20.11 ± 0.5%; 207Pb/204Pb = 15.776 ± 0.6%; 208Pb/204Pb = 40.6 ± 1% (all uncertainties 1-sigma); (NMNH-107667) 206Pb/204Pb = 19.62 ± 1%; 207Pb/204Pb = 15.77 ± 0.9%; 208Pb/204Pb = 40.5 ± 1% (all uncertainties 1-sigma).
Producer defined
0.237
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.031
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.074
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.19
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.305
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.092
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.048
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.111
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.632
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.643
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.301
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.294
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.185
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.049
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.846
Measured ratio of 208 Lead to 206 Lead
Producer defined
0.296
Measured ratio of 208 Lead to 206 Lead
Producer defined
1.305
Measured ratio of 208 Lead to 206 Lead
Producer defined
207Pb/206Pb
Measured ratio of 207 Lead to 206 Lead, which is unitless, corrected for fractionation, spike, and common Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(e)
Footnote reference: (e) Corrected for fractionation, spike, and common Pb; up to 0.5 pg of common Pb was assumed to be procedural blank: 206Pb/204Pb = 18.042 ± 0.61%; 207Pb/204Pb = 15.537 ± 0.52%; 208Pb/204Pb = 37.686 ± 0.63% (all uncertainties 1-sigma). Remaining initial common Pb was assigned a composition based upon the Total Pb regression of Ludwig (2008): (6GE-005) 206Pb/204Pb = 20.11 ± 0.5%; 207Pb/204Pb = 15.776 ± 0.6%; 208Pb/204Pb = 40.6 ± 1% (all uncertainties 1-sigma); (NMNH-107667) 206Pb/204Pb = 19.62 ± 1%; 207Pb/204Pb = 15.77 ± 0.9%; 208Pb/204Pb = 40.5 ± 1% (all uncertainties 1-sigma).
Producer defined
0.047791
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.047323
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.047922
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.044781
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.045715
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.046986
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.046518
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.048182
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.046562
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.04765
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.047626
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.046952
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.047103
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.046956
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.045174
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.046949
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.046925
Measured ratio of 207 Lead to 206 Lead
Producer defined
_207Pb/206Pb
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 207 Lead to 206 Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
7.569
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
1.3
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
3.232
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
10.616
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
13.868
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
3.085
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
1.117
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
2.332
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
8.63
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
4.048
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
2.018
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
1.928
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
1.169
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.353
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
5.84
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
1.884
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
8.251
2 sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
207Pb/235U
Measured ratio of 207 Lead to 235 Lead corrected for fractionation, spike, and common Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(e)
Footnote reference: (e) Corrected for fractionation, spike, and common Pb; up to 0.5 pg of common Pb was assumed to be procedural blank: 206Pb/204Pb = 18.042 ± 0.61%; 207Pb/204Pb = 15.537 ± 0.52%; 208Pb/204Pb = 37.686 ± 0.63% (all uncertainties 1-sigma). Remaining initial common Pb was assigned a composition based upon the Total Pb regression of Ludwig (2008): (6GE-005) 206Pb/204Pb = 20.11 ± 0.5%; 207Pb/204Pb = 15.776 ± 0.6%; 208Pb/204Pb = 40.6 ± 1% (all uncertainties 1-sigma); (NMNH-107667) 206Pb/204Pb = 19.62 ± 1%; 207Pb/204Pb = 15.77 ± 0.9%; 208Pb/204Pb = 40.5 ± 1% (all uncertainties 1-sigma).
Producer defined
0.058522
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.057748
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.058304
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.054064
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.055589
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.057067
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.056466
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.059114
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.057217
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.058999
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.058214
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.057214
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.058282
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.058132
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.054574
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.058185
Measured ratio of 207 Lead to 235 Lead
Producer defined
0.058006
Measured ratio of 207 Lead to 235 Lead
Producer defined
%err_207Pb/235U
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 207 Lead to 235 Uranium
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
7.584
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
1.337
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
3.257
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
10.678
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
13.867
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
3.207
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
1.166
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
2.373
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
8.596
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
3.974
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
2.012
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
1.918
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
1.172
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
0.389
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
5.738
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
1.869
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
8.078
2 sigma percent error of the measured ratio of 207 Lead to 235 Uranium
Producer defined
206Pb/238U
Measured ratio of 206 Lead to 238 Uranium corrected for fractionation, spike, and common Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(e)
Footnote reference: (e) Corrected for fractionation, spike, and common Pb; up to 0.5 pg of common Pb was assumed to be procedural blank: 206Pb/204Pb = 18.042 ± 0.61%; 207Pb/204Pb = 15.537 ± 0.52%; 208Pb/204Pb = 37.686 ± 0.63% (all uncertainties 1-sigma). Remaining initial common Pb was assigned a composition based upon the Total Pb regression of Ludwig (2008): (6GE-005) 206Pb/204Pb = 20.11 ± 0.5%; 207Pb/204Pb = 15.776 ± 0.6%; 208Pb/204Pb = 40.6 ± 1% (all uncertainties 1-sigma); (NMNH-107667) 206Pb/204Pb = 19.62 ± 1%; 207Pb/204Pb = 15.77 ± 0.9%; 208Pb/204Pb = 40.5 ± 1% (all uncertainties 1-sigma).
Producer defined
0.008881
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.00885
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008824
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008756
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008819
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008809
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008804
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008898
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008912
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.00898
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008865
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008838
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008974
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008979
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008762
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008988
Measured ratio of 206 Lead to 238 Uranium
Producer defined
0.008965
Measured ratio of 206 Lead to 238 Uranium
Producer defined
206Pb/238U
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 206 Lead to 238 Uranium
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
1.623
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.234
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.572
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
1.663
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
2.324
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.408
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.205
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.407
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
1.016
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
1.023
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.491
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.476
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.3
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.108
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
1.403
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
0.472
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
2.057
2 sigma percent error of the measured ratio of 206 Lead to 238 Uranium
Producer defined
corr._coef.
Coefficient used for ratio correction to compensate for fractionation, spike, and common Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
0.116
Coefficient used for ratio correction
Producer defined
0.242
Coefficient used for ratio correction
Producer defined
0.132
Coefficient used for ratio correction
Producer defined
0.115
Coefficient used for ratio correction
Producer defined
0.083
Coefficient used for ratio correction
Producer defined
0.356
Coefficient used for ratio correction
Producer defined
0.321
Coefficient used for ratio correction
Producer defined
0.187
Coefficient used for ratio correction
Producer defined
0.026
Coefficient used for ratio correction
Producer defined
0.056
Coefficient used for ratio correction
Producer defined
0.109
Coefficient used for ratio correction
Producer defined
0.103
Coefficient used for ratio correction
Producer defined
0.136
Coefficient used for ratio correction
Producer defined
0.456
Coefficient used for ratio correction
Producer defined
0.048
Coefficient used for ratio correction
Producer defined
0.093
Coefficient used for ratio correction
Producer defined
0.041
Coefficient used for ratio correction
Producer defined
207Pb/206Pb
Individual grain 207 Lead to 206 Lead age in millions of years (Ma)
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(g)
Footnote reference: (g) Calculations are based on the decay constants of Jaffey et al. (1971). 206Pb/238U and 207Pb/206Pb ages corrected for initial disequilibrium in 230Th/238U using Th/U [magma] = 3.
Producer defined
89
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
66
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
95
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
-68
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
-17
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
49
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
25
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
108
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
27
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
82
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
81
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
47
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
54
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
-46
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
45
Individual grain 207 Lead to 206 Lead age in millions of years
Producer defined
±_207Pb/206Pb
Uncertainty ratio range for 207 Lead to 206 Lead grain age corrected for fractionation, spike, and common Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
179
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
31
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
76
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
259
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
335
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
74
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
27
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
55
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
207
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
96
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
48
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
46
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
28
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
8
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
142
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
45
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
197
Uncertainty ratio range for 207 Lead to 206 Lead spot age
Producer defined
207Pb/235U
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(g)
Footnote reference: (g) Calculations are based on the decay constants of Jaffey et al. (1971). 206Pb/238U and 207Pb/206Pb ages corrected for initial disequilibrium in 230Th/238U using Th/U [magma] = 3.
Producer defined
57.75
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
57.01
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
57.54
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
53.46
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
54.93
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
56.35
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
55.77
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
58.32
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
56.5
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
58.21
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
57.45
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
56.49
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
57.52
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
57.37
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
53.95
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
57.43
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
57.25
Individual grain 207 Lead to 235 Uranium age in millions of years (Ma)
Producer defined
±_207Pb/235U
Uncertainty ratio range for 207 Lead to 235 Uranium grain age corrected for fractionation, spike, and common Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
4.26
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
0.74
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
1.82
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
5.56
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
7.41
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
1.76
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
0.63
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
1.34
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
4.72
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
2.25
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
1.12
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
1.05
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
0.66
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
0.22
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
3.01
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
1.04
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
4.5
Uncertainty ratio range for 207 Lead to 235 Uranium grain age
Producer defined
206Pb/238U
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(g)
Footnote reference: (g) Calculations are based on the decay constants of Jaffey et al. (1971). 206Pb/238U and 207Pb/206Pb ages corrected for initial disequilibrium in 230Th/238U using Th/U [magma] = 3.
Producer defined
57
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.8
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.63
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.2
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.6
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.54
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.5
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
57.11
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
57.2
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
57.63
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.9
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.72
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
57.59
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
57.62
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
56.24
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
57.68
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
57.54
Individual grain 206 Lead to 238 Uranium age in millions of years (Ma)
Producer defined
±_206Pb/238U
Uncertainty ratio range for 206 Lead to 238 Uranium grain age corrected for fractionation, spike, and common Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
0.92
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.13
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.32
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.93
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
1.31
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.23
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.12
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.58
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.59
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.28
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.27
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.17
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.06
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
0.79
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
1.18
Uncertainty ratio range for 206 Lead to 238 Uranium grain age
Producer defined
Sample
Alpha numeric identification for analyses of fragments from same crystal. sch1, sch2 etc. are labels for single scheelite grain fragments spiked and dissolved for ID-TIMS analysis. Letter-number combinations are replicate analyses of fragments from same crystal.
Producer Defined
238U/206Pb
Measured ratio of 238 Lead to 206 Lead corrected for fractionation, spike, and blank Pb only
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(h)
Footnote reference: (h) Corrected for fractionation, spike, and blank Pb only.
Producer defined
43.2439
Measured ratio of 238 Lead to 206 Lead
Producer defined
93.2628
Measured ratio of 238 Lead to 206 Lead
Producer defined
72.8441
Measured ratio of 238 Lead to 206 Lead
Producer defined
43.367
Measured ratio of 238 Lead to 206 Lead
Producer defined
34.2902
Measured ratio of 238 Lead to 206 Lead
Producer defined
83.2078
Measured ratio of 238 Lead to 206 Lead
Producer defined
97.749
Measured ratio of 238 Lead to 206 Lead
Producer defined
81.1835
Measured ratio of 238 Lead to 206 Lead
Producer defined
73.9189
Measured ratio of 238 Lead to 206 Lead
Producer defined
73.2026
Measured ratio of 238 Lead to 206 Lead
Producer defined
90.5766
Measured ratio of 238 Lead to 206 Lead
Producer defined
91.4388
Measured ratio of 238 Lead to 206 Lead
Producer defined
97.2868
Measured ratio of 238 Lead to 206 Lead
Producer defined
107.3538
Measured ratio of 238 Lead to 206 Lead
Producer defined
66.4599
Measured ratio of 238 Lead to 206 Lead
Producer defined
89.9961
Measured ratio of 238 Lead to 206 Lead
Producer defined
54.298
Measured ratio of 238 Lead to 206 Lead
Producer defined
%err_238U/206Pb
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 238 Uranium to 206 Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
0.326
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.147
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.194
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.37
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.149
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.389
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.223
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.352
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.102
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.113
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.143
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.291
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.088
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.125
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.186
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.118
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
0.164
2-sigma percent error of the measured ratio of 238 Uranium to 206 Lead
Producer defined
207Pb/206Pb
Measured ratio of 207 Lead to 206 Lead corrected for fractionation, spike, and blank Pb only
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(h)
Footnote reference: (h) Corrected for fractionation, spike, and blank Pb only.
Producer defined
0.50201
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.17701
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.31181
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.50406
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.56144
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.24482
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.15046
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.25345
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.30494
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.30672
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.19726
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.19283
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.14411
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.0756
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.36174
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.19221
Measured ratio of 207 Lead to 206 Lead
Producer defined
0.43458
Measured ratio of 207 Lead to 206 Lead
Producer defined
%err_207Pb/206Pb
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 207 Lead to 206 Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
0.237
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.501
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.325
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.267
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.093
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.956
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.94
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.829
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.146
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.169
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.424
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.977
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.23
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
1.065
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.246
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.332
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
0.156
2-sigma percent error of the measured ratio of 207 Lead to 206 Lead
Producer defined
204Pb/206Pb
Measured ratio of 204 Lead to 206 Lead corrected for fractionation, spike, and blank Pb only
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(h)
Footnote reference: (h) Corrected for fractionation, spike, and blank Pb only.
Producer defined
0.03066
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.00874
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.01781
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.03087
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.03471
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.01334
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.007
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.01386
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.01739
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.01746
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.01008
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.00982
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.00653
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.00192
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.02127
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.00978
Measured ratio of 204 Lead to 206 Lead
Producer defined
0.02611
Measured ratio of 204 Lead to 206 Lead
Producer defined
%err_204Pb/206Pb
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 204 Lead to 206 Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
0.29
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.702
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.403
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.328
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.151
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
1.259
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
1.389
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
1.046
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.203
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.23
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.592
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
1.315
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.356
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
2.852
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.305
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.456
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
0.207
2-sigma percent error of the measured ratio of 204 Lead to 206 Lead
Producer defined
8/6-7/6
Correction coefficient for fractionation, spike, and blank Pb only between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer Defined
corr._coef.
Correction coefficient
Producer defined
—
Necessary spacer between batches of analyses
Producer defined
-0.989
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.92
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.975
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.965
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.922
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.97
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.904
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.889
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.91
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.918
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.98
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.67
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.848
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.979
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.872
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
-0.96
Correction coefficient between 238 Uranium and 207 Lead with 206 Lead as the denominator
Producer defined
8/6-4/6
Correction coefficient for fractionation, spike, and blank Pb only between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer Defined
corr._coef.
Correction coefficient
Producer defined
—
Necessary spacer between batches of analyses
Producer defined
-0.788
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.783
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.789
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.786
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.129
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.897
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.853
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.946
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.207
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.354
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.732
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.942
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.24
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.796
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.713
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.622
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
-0.485
Correction coefficient between 238 Uranium and 204 Lead with 206 Lead as the denominator
Producer defined
7/6-4/6
Correction coefficient for fractionation, spike, and blank Pb only between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer Defined
corr._coef.
Correction coefficient
Producer defined
—
Necessary spacer between batches of analyses
Producer defined
0.744
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.945
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.871
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.746
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
-0.134
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.929
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.978
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.975
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.462
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.577
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.902
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.984
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.808
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.993
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.778
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.891
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
0.494
Correction coefficient for between 207 Lead and 204 Lead with 206 Lead as the denominator
Producer defined
238U/204Pb
Measured ratio of 238 Uranium to 204 Lead corrected for fractionation, spike, and blank Pb only
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(h)
Footnote reference: (h) Corrected for fractionation, spike, and blank Pb only.
Producer defined
1410.5
Measured ratio of 238 Uranium to 204 Lead
Producer defined
10665.4
Measured ratio of 238 Uranium to 204 Lead
Producer defined
4089.5
Measured ratio of 238 Uranium to 204 Lead
Producer defined
1404.7
Measured ratio of 238 Uranium to 204 Lead
Producer defined
987.9
Measured ratio of 238 Uranium to 204 Lead
Producer defined
6239.7
Measured ratio of 238 Uranium to 204 Lead
Producer defined
13964.8
Measured ratio of 238 Uranium to 204 Lead
Producer defined
5857.8
Measured ratio of 238 Uranium to 204 Lead
Producer defined
4250.3
Measured ratio of 238 Uranium to 204 Lead
Producer defined
4191.8
Measured ratio of 238 Uranium to 204 Lead
Producer defined
8982.9
Measured ratio of 238 Uranium to 204 Lead
Producer defined
9309.7
Measured ratio of 238 Uranium to 204 Lead
Producer defined
14897.1
Measured ratio of 238 Uranium to 204 Lead
Producer defined
55805.8
Measured ratio of 238 Uranium to 204 Lead
Producer defined
3124.5
Measured ratio of 238 Uranium to 204 Lead
Producer defined
9201.9
Measured ratio of 238 Uranium to 204 Lead
Producer defined
2079.7
Measured ratio of 238 Uranium to 204 Lead
Producer defined
%err_238U/204Pb
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 238 Uranium to 204 Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
0.583
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.822
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.569
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.66
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.225
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
1.617
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
1.583
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
1.384
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.245
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.29
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.704
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
1.591
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.387
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
2.952
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.457
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.537
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
0.32
2-sigma percent error of the measured ratio of 238 Uranium to 204 Lead
Producer defined
206Pb/204Pb
Measured ratio of 206 Lead to 204 Lead corrected for fractionation, spike, and blank Pb only
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(h)
Footnote reference: (h) Corrected for fractionation, spike, and blank Pb only.
Producer defined
32.618
Measured ratio of 206 Lead to 204 Lead
Producer defined
114.358
Measured ratio of 206 Lead to 204 Lead
Producer defined
56.141
Measured ratio of 206 Lead to 204 Lead
Producer defined
32.39
Measured ratio of 206 Lead to 204 Lead
Producer defined
28.809
Measured ratio of 206 Lead to 204 Lead
Producer defined
74.989
Measured ratio of 206 Lead to 204 Lead
Producer defined
142.864
Measured ratio of 206 Lead to 204 Lead
Producer defined
72.155
Measured ratio of 206 Lead to 204 Lead
Producer defined
57.499
Measured ratio of 206 Lead to 204 Lead
Producer defined
57.263
Measured ratio of 206 Lead to 204 Lead
Producer defined
99.174
Measured ratio of 206 Lead to 204 Lead
Producer defined
101.813
Measured ratio of 206 Lead to 204 Lead
Producer defined
153.125
Measured ratio of 206 Lead to 204 Lead
Producer defined
519.83
Measured ratio of 206 Lead to 204 Lead
Producer defined
47.013
Measured ratio of 206 Lead to 204 Lead
Producer defined
102.247
Measured ratio of 206 Lead to 204 Lead
Producer defined
38.301
Measured ratio of 206 Lead to 204 Lead
Producer defined
%err_206Pb/204Pb
Errors are 2-sigma, or 2 standard deviations, as percent of the measured ratio of 206 Lead to 204 Lead
Producer Defined
—
Necessary spacer between batches of analyses
Producer defined
(f)
Footnote reference: (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007).
Producer defined
0.29
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.702
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.403
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.328
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.151
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
1.259
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
1.389
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
1.046
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.203
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.23
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.592
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
1.315
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.356
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
2.852
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.305
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.456
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
0.207
2-sigma percent error of the measured ratio of 206 Lead to 204 Lead
Producer defined
8/4-6/4
Correction coefficient for fractionation, spike, and blank Pb only between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer Defined
corr._coef.
Correction coefficient
Producer defined
—
Necessary spacer between batches of analyses
Producer defined
0.939
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.994
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.978
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.938
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.756
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.997
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.914
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.931
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.99
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.998
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.976
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
1
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.958
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.985
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
0.894
Correction coefficient between 238 Uranium and 206 Lead with 204 Lead as the denominator
Producer defined
A total of 8 data table files are included in this metadata that are named as follows:
Sm-Nd Scheelite Data Summary
U-Pb Scheelite Ages Summary
U-Pb Scheelite Fractionation Factor Data
U-Pb Scheelite Fractionation Factor Ratios
U-Pb Scheelite ICPMS Instrument Data
U-Pb Scheelite ICPMS Sample Data
U-Pb Scheelite ICPMS Standard Data
U-Pb Scheelite TIMS Sample Data
Wintzer, N.E., Schmitz, M.D., Gillerman, V.S., and Vervoort, J.D., 2020, Isotopic ratios and element concentrations of U-Pb and Sm-Nd for scheelite petrochronology: U.S. Geological Survey data release, https://doi.org/10.5066/P9QH5ZYP.
GS ScienceBase
U.S. Geological Survey
mailing address
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
United States
1-888-275-8747
sciencebase@usgs.gov
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein
Digital Data
https://doi.org/10.5066/P9QH5ZYP
None
20200820
Niki E Wintzer
U.S. Geological Survey
Geologist
mailing address
Rm. 202
Spokane
WA
99201
US
509-368-3110
509-368-3199
nwintzer@usgs.gov
FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata
FGDC-STD-001.1-1999