Ian W. Hillenbrand Amy K. Gilmer Alexander D. Lusk 20250917 spreadsheet Denver, CO U.S. Geological Survey Hillenbrand, I.W., Gilmer, A.K., and Lusk, A.D., 2025, Geochemical, Geochronologic, and Isotopic Data for Proterozoic rocks from Arizona, California, Colorado, New Mexico, and Utah: U.S. Geological Survey data release, https://doi.org/10.5066/P1YHZDWZ https://doi.org/10.5066/P1YHZDWZ This U.S. Geological Survey (USGS) data release includes whole-rock major, trace, and rare earth element geochemical data, whole-rock Nd-Pb-Sr isotopic data collected by thermal ionization mass spectrometry (TIMS), and zircon U-Pb isotopic data collected by laser ablation-inductively coupled mass spectrometry (LA-ICP-MS) methods. These data provide constraints on, and characterize, the composition and ages of crystalline basement rocks in the western United States, supporting geologic mapping and mineral systems analysis of critical mineral deposits. This data set is part of an effort to establish the age and geochemical character of Proterozoic crystalline basement rocks in the United States to support geologic mapping and exploration for critical mineral deposits in the United States. We appreciate help with sample collection from John Bailey, Michael Frothingham, Karl Karlstrom, Kevin Mahan, Sammy Malavarca, Rick Moscati, Wayne Premo, Ren Thompson, and Mike Williams. Author ORCID: Ian Hillenbrand: 0000-0003-2801-3674; Amy Gilmer: 0000-0001-5038-8136; Alexander Lusk: 0000-0002-4660-0648. 20210815 20250415 publication date Complete None planned -117.3500 -105.1618 41.0515 35.3691 ISO 19115 Topic Category geoscientificInformation USGS Thesaurus geochemistry chemical analysis igneous rocks metamorphic rocks geochronology rare earth elements isotope geochemistry critical minerals Proterozoic U.S. Geological Survey isotopic mapping USGS Metadata Identifier USGS:6838c7abd4be025925747123 Common geographic areas California Arizona Colorado Utah New Mexico Colorado Front Range Uncompahgre uplift Picuris Mountains Gunnison uplift Grand Canyon Death Valley Colorado National Monument Laramie Range Unaweep Canyon Needle Mountains Black Ridge Canyons Wilderness None. Please see 'Distribution Info' for details. 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. Ian Hillenbrand U.S. Geological Survey, ROCKY MOUNTAIN REGION Research Geologist mailing address

1 Denver Federal Center

Building 810, Mail Stop 980

Denver CO 80225 US 303-236-1636 303-236-5349 ihillenbrand@usgs.gov This work was funded by the USGS Mineral Resources Program. Attribute fields and values were reviewed and checked for accuracy and consistency of terms. No formal logical accuracy tests were conducted. Each sample must have a unique identifying number, Sample_ID. Each sample must have a latitude and longitude. Each sample must be identified as a rock. The samples in this data set were collected for the same project purposes and were all subject to the same sample preparation protocol. Samples were analyzed using documented techniques. All data fell within expected ranges. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Hand sample locations collected by GPS receiver are accurate to about 3 meters (nearest second of latitude or longitude), but may vary by as much as 10 meters of the true location. Pre-GPS locations were based on topographic map location and may vary as much as 10 km from the true location. Positional accuracy for each sample is reported in the data tables. No formal positional accuracy tests were conducted. Surface samples were collected from ground surface. Lance P. Black Sandra L. Kamo Charlotte M. Allen Donald W. Davis John N. Aleinikoff John W. Valley Roland Mundil Ian H. Campbell Russell J. Korsch Ian S. Williams Chris Foudoulis 200404 publication Chemical Geology vol. 205, issue 1-2 n/a Elsevier BV ppg. 115-140 https://doi.org/10.1016/j.chemgeo.2004.01.003 Digital and/or Hardcopy 200404 publication date Black et al., 2004 Methods W. Todt R. Cliff A. Hanser A. Hofmann 19960101 publication Reading the Isotopic Code, Geophys. Monogr 94 p. 429-437 Digital and/or Hardcopy 19960101 observed Todt et al., 1996 Standards G.W. Lugmair N.B. Scheinin K. Marti 19750101 publication Proceedings of lunar and planetary science conference v. 6 Digital and/or Hardcopy 19750101 publication date Lugmair et al., 1975 Methods Joseph E. Taggart, Jr. 20020101 publication U.S. Geological Survey Open-File Report 02-0223 Denver US Geological Survey https://pubsdata.usgs.gov/pubs/of/2002/ofr-02-0223/ Digital and/or Hardcopy 20020101 publication date Taggart, 2002 Geochemical methods George Gehrels Mark Pecha 20140101 publication Geosphere 10/1 Boulder,CO Geological Society of America https://doi.org/10.1130/GES00889.1 Digital and/or Hardcopy 20140101 publication date Gehrels and Pecha 2014 Methods George E. Gehrels Victor Valencia J. Ruiz 20080101 publication Geochemistry, Geophysics, Geosystems 9 San Francisco American Geopshysical Union https://doi.org/10.1029/2007GC001805 Digital and/or Hardcopy 20080101 publication date Gehrels et al. 2008 Methods James B. Paces J.D. Miller 19930101 tabular digital data Journal of Geophysical Research, Solid Earth 98/B8 San Francisco American Geophysical Union https://doi.org/10.1029/93JB01159 Digital and/or Hardcopy 19930101 publication date Paces and Miller, 1993 Methods Tsuyoshi Tanaka Shigeko Togashi Hikari Kamioka Hiroshi Amakawa Hiroo Kagami Takuji Hamamoto Masaki Yuhara Yuji Orihashi Shigekazu Yoneda Hiroshi Shimizu Takanori Kunimaru Kazuya Takahashi Takeru Yanagi Takanori Nakano Hirokazu Fujimaki Ryuichi Shinjo Yoshihiro Asahara Masaharu Tanimizu Cristian Dragusanu 20000801 publication Chemical Geology vol. 168, issue 3-4 n/a Elsevier BV https://doi.org/10.1016/S0009-2541(00)00198-4 Digital and/or Hardcopy 20000801 publication date Tanaka et al., 2000 Standards Outcrop samples were collected in the field. We collected the visually freshest, least altered material available and avoided weathered and altered areas. 20230606 Amy K Gilmer U.S. Geological Survey, ROCKY MOUNTAIN REGION Research Geologist mailing address

Mail Stop 980, W 6th Ave Kipling St

Lakewood CO 80225 US 303-236-1636 303-236-5349 agilmer@usgs.gov The samples analyzed for whole-rock major and trace element geochemistry were submitted to the Sample Control project of the USGS Geology, Geophysics, and Geochemistry Science Center where they were recorded and prepared for analysis. The samples were powdered to a less than 200 mesh in a pulverizer equipped with ceramic plates or a disc mill using an alumina or agate chamber. The samples were mixed to ensure homogeneity before subsequent analysis. Bulk rock compositions were determined by X-ray fluorescence (XRF) for major elements using the methods described by Taggart (2002). The sample is first ignited, then fused with lithium tetraborate, and the resultant glass disc is introduced into a wavelength dispersive X-ray spectrometer. The disc is irradiated with X-rays from an X-ray tube. X-ray photons emitted by the elements in the sample are counted and concentrations determined using previously prepared calibration standards. In addition, a gravimetric loss-on ignition was also determined. Minor and trace elements abundances were determined by inductively coupled-plasma mass spectrometry (ICP-MS) using the methods of Taggart (2002). A multi-acid decomposition (a mixture of hydrochloric, nitric, perchloric, and hydrofluoric acids) is used to digest the powdered geologic material. The ICP-MS is calibrated on a 1% nitric acid blank solution and two multi-element standard solutions to cover the mass range and generate the mass response curve. Taggart, 2002 20230303 Jaime S Azain U.S. Geological Survey, ROCKY MOUNTAIN REGION Geologist mailing address

Mail Stop 973, W 6th Ave Kipling St

Lakewood CO 80225 US 303-236-9376 303-236-3200 jsazain@usgs.gov Mineral separations were completed by Zirchron LLC, Tucson, Arizona using the following process to obtain zircon separates: electrical pulse disaggregation, density separation on a water table, density separation in methylene iodide (MEI) to remove particles with specific gravity <3.33, and magnetic separation using a Frantz magnetic separator. Zircon grains were bulk mounted in epoxy along with zircon reference materials. Zircon grains were imaged using cathodoluminescence using a scanning electron microscope at the USGS Microbeam Facility, Denver, Colorado, or at the University of Arizona Laserchron Facility, Tucson, Arizona. Measurements of U-Th-Pb isotopic ratios from detrital zircon grains were made using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) with an Element 2 mass spectrometer at the University of Arizona LaserChron Center following standard analytical methods (Gehrels et al., 2008; Gehrels and Pecha, 2014). Individual zircons were ablated using a Photon Machines Analyte G2 excimer laser that delivered a 15 to 20 μm beam to user-selected crystal locations. Spot selection emphasized sampling such that all non-metamict zircon grain sizes and morphologies were represented. Where present, metamorphic rims were also analyzed. FC-1 zircon (1099.0 ± 0.6 Ma; Paces and Miller, 1993) was used as a primary standard, whereas SL (563.5 ± 3.2 Ma; Gehrels et al., 2008) and R33 (419.260 ± 0.39 Ma; Black et al., 2004) zircon were used as secondary standards. A total of 200 to 315 zircon grains of unknown age were targeted per sample. Analyses were excluded from age interpretation based on the following filters: having 206Pb/238U ratios with > 10% precision; having 206Pb/207Pb ratios with > 10% precision unless associated with 206Pb/238U ages less than 400 Ma; showing 20% discordance and/or 5% reverse discordance based on apparent 206Pb/238U versus 206Pb/207Pb ages; and having > 600 Pb counts per second. 207Pb/206Pb ages were preferred as all analyses were > 900 Ma. All raw detrital zircon uncertainties are reported herein at the two sigma confidence interval (including only analytical uncertainty, but with external uncertainty noted). Black et al., 2004 Gehrels and Pecha 2014 Gehrels et al. 2008 Paces and Miller, 1993 20230606 George Gehrels University of Arizona Laserchron Facility Professor mailing address

1040 4th Street

Tucson AZ 85721 US 520-349-4702 ggehrels@email.arizona.edu Sample powder generated in step 2 (whole-rock major and trace element geochemistry) was submitted to Carleton University, Ottawa, Canada for Nd, Pb, and Sr isotopic analysis using thermal ionization mass spectrometry (TIMS). Samples were prepared in a class 1000 clean room and were in the Isotope Geochemistry and Geochronology Research Center at Carleton University, Canada. Between 100 to 150 milligrams of sample powders were weighed into Savillex Teflon beakers or Parr’s Acid Digestion Vessels and dissolved with 1 to 3 mL concentrated HF-HNO3 mixture on a hotplate at 1300 degrees C (for Savillex Teflon beakers) or in an oven at 1400 degrees C (for Parr’s Acid Digestion Vessels) for several days and were then evaporated to dryness. The sample residues were re-dissolved sequentially with 7M HNO3 and 6M HCl to achieve complete dissolution. Pb, Sr, Nd were sequentially separated using ion exchange chromatography columns. The sample digests were taken up with 1.5mL 1M HBr and loaded onto Bio-Rad polyethylene columns filled with 0.6mL anion resin (Bio-Rad AG1-X8 100-200 mesh); columns were washed with 5mL 1 M HBr; wash solutions were collected for later separation of Sr and Nd; Pb is eluted in 5mL of 6M HCl. The second-pass Pb columns (with 0.2mL resin bed and reduced acid volumes) were run to yield highly pure Pb. The wash solutions from Pb columns were evaporated to dryness, dissolved with 1.5ml 2.5M HCl and loaded onto primary columns filled with 3mL of cation resin (Bio-Rad AG50W-X8, 200-400 mesh). Sr was eluted with 7mL 2.5M HCl after the columns were washed with 16ml 2.5M HCl. The columns were washed with 3mL 6M HCl before light and middle REE were collected with 9ml 6M HCl. To remove excessive Rb and other impurities, the Sr residues were purified using columns containing 100µL of Sr-Spec resin (50-100µm, Eichrom Technologies, LLC, USA). Sr residues were taken up with 0.4mL 7M HNO3 and loaded onto the columns. Columns were washed with 1.6mL of 7M HNO3 and Sr was eluted with 1.6mL Millipore water. The REE residues were taken up in 0.5mL 0.26M HCl and were loaded onto prepacked 2mL LN-resin columns (50-100µm, Eichrom Technologies, LLC, USA). The columns were washed with 6.5mL 0.26M HCl before Nd was eluted with 4.5ml 0.26M HCl. Prior to measurements, Pb sample solutions (in 2% HNO3) were doped with Tl solution (in a mass ratio of Tl/Pb =1:4); Pb isotope ratios were internally normalized to 203Tl/205Tl=0.418922 and were also normalized to NBS981 values of Todt et al., (1996). Sr and Nd isotopic ratios were normalized to 86Sr/88Sr=0.1194, 146Nd/144Nd=0.7219, respectively. For a period of six months covering this analysis session, standard reference materials’ values are: NBS981,206Pb/204Pb=16.9305±0.0011, 207Pb/204Pb=15.4847±0.0011, 208Pb/204Pb=36.6784±0.0040 (2SD, n=25); NBS987, 87Sr/86Sr=0.710234±0.000016 (2SD, n=38); JNdi-1 (Tanaka, et al, 2000), 143Nd/144Nd= 0.512094±0.000016 (2SD, n=45); BCR-2, 206Pb/204Pb=18.7586, 207Pb/204Pb=15.6173, 208Pb/204Pb=38.7220 (n=2). 87Sr/86Sr=0.705000 (n=2), 143Nd/144Nd=0.512626 (n=2). Total procedure blanks are <50 pg for Pb, <250 pg for Sr and <50 pg for Nd. Tanaka et al., 2000 Todt et al., 1996 20230606 Isotope Geochemistry and Geochronology Research Centre, Carleton University Shuangquan Zhang Laboratory Manager mailing address

1125 Colonel By Drive

Ottawa Ontario K1S 5B6 Canada 613-520-2600 shuangquan.zhang@carleton.ca Sample powder generated in step 2 was submitted to the Denver Radiogenic Isotope Laboratory of the U.S. Geological Survey, Denver, Colorado, for Nd isotopic analysis using thermal ionization mass spectrometry (TIMS). Neodymium was loaded on the side filament of a triple Re filament assembly and analyzed using an IsotopX Phoenix TIMS. Isotopic ratios of unknown samples and standard reference materials were measured using Faraday detectors and an ATONA amplification system in dynamic multicollector mode with 144Nd = 1-12 to 1-11 A (correseponding to 100 mV to 1 V relative to traditional 1011 Ω amplifiers). A mass bias correction was applied to measured 143Nd/144Nd ratios assuming exponential fractionation behavior and normalized to 146Nd/144144 = 0.7219. The Nd isotope standard JNdi-1 (Tanaka, et al, 2000) was measured in replicate to monitor laboratory and instrument behavior. Nine analyses of JNdi-1 yielded a value of 0.512109±0.000013 (uncertainty reported at two standard deviations, absolute). Tanaka et al., 2000 20240910 Ryan Frazer U.S. Geological Survey, ROCKY MOUNTAIN REGION Geologist mailing

1 Denver Federal Center

P.O. Box 25046, MS 963

Denver Colorado 80225 US 303-236-1276 rfrazer@usgs.gov Table Attribute_Definition Description Minimum Maximum Units SampleSummary.csv SampleID Collector's sample name, often field name or number. NA NA NA SampleSummary.csv Locality Name of the specific place where the sample was collected. NA NA NA SampleSummary.csv Lat Latitude of the location where the sample was collected, entered in decimal degrees in the geodatum from the original publication (listed in geodatum column). Negative values for South latitudes. 35.36908 41.051528 decimal degrees SampleSummary.csv Long Longitude of the location where the sample was collected, entered in decimal degrees in the geodatum from the original publication (listed in geodatum column). Negative values for West longitudes. -117.35 -105.161833 decimal degrees SampleSummary.csv FieldName Taxonomy (field name) informal classification of sample. NA NA NA SampleSummary.csv GeologicalUnit A body of rock established as a distinct entity in the classification of the Earth's rocks. NA NA NA SampleSummary.csv GeoDatum Geodetic datum for the sample coordinates. NA NA NA SampleSummary.csv Country Country where the sample was collected. NA NA NA SampleSummary.csv StateProvince State or province where the sample was collected. NA NA NA SampleSummary.csv RelatedCitation Reference citation for additional sample context. NA NA NA SampleSummary.csv Material Material of which the sample consists (e.g. Rock, Sediment, Soil, etc.). NA NA NA SampleSummary.csv CollectionMethod Method by which a sample was collected. NA NA NA SampleSummary.csv RockClass Formal categorization of sample. NA NA NA SampleSummary.csv SampleSrc Source or environment from which the sample was collected (e.g. natural exposure/outcrop, drillcore, etc.). NA NA NA SampleSummary.csv SampleType Describes the type of sample (e.g. Individual Sample, Core, Cuttings, etc.). NA NA NA SampleSummary.csv LocPrecType Source of location information includes whether publication lists coordinates or if coordinates have been georeferenced from a field map. NA NA NA SampleSummary.csv LocPrec Location precision in meters (m). Use "-9999" for exact coordinates. -9999 5000 m SampleSummary.csv Geochemistry Indicates if this sample was analyzed for whole-rock major and trace element geochemistry. NA NA NA SampleSummary.csv Geochronology Indicates if this sample was analyzed for zircon U-Pb geochronology. NA NA NA SampleSummary.csv Isotopes Indicates if this sample was analyzed for whole-rock radiogenic isotope geochemistry. NA NA NA Geochemistry.csv SampleID Collector's sample name often field name or number. NA NA NA Geochemistry.csv LabID Identifier for tracking sample through USGS Sample Control processes. Value of -9999 indicates Lab_ID was not available. NA NA NA Geochemistry.csv SiO2_pct Silicon oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 30.93 79.95 weight percent Geochemistry.csv Al2O3_pct Aluminum oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 9.97 29.21 weight percent Geochemistry.csv BaO_pct Barium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.01 0.28 weight percent Geochemistry.csv CaO_pct Calcium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.02 11.52 weight percent Geochemistry.csv Cr2O3_pct Chromium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.01 0.18 weight percent Geochemistry.csv Fe2O3_pct Iron oxide (Fe2O3), in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.83 23.13 weight percent Geochemistry.csv K2O_pct Potassium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.11 6.99 weight percent Geochemistry.csv MgO_pct Magnesium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.17 14.15 weight percent Geochemistry.csv MnO_pct Manganese, in oxide weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.01 0.43 weight percent Geochemistry.csv Na2O_pct Sodium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.09 5.44 weight percent Geochemistry.csv P2O5_pct Phosphorous oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.01 1.5 weight percent Geochemistry.csv SrO_pct Strontium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.01 0.14 weight percent Geochemistry.csv TiO2_pct Titanium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.08 2.54 weight percent Geochemistry.csv V2O5_pct Vanadium oxide, in weight percent unnormalized. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.01 0.07 weight percent Geochemistry.csv LOI Loss on ignition, in weight percent. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0 9.64 weight percent Geochemistry.csv H2O_Minus Negative water, in weight percent. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.03 0.1 weight percent Geochemistry.csv H2O_Plus Positive water, in weight percent. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.5 2.2 weight percent Geochemistry.csv Total_H2O Total water, in weight percent. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.53 2.3 weight percent Geochemistry.csv Ag_ppm Silver concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -1 1 parts per million (ppm) Geochemistry.csv As_ppm Arsenic concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -5 20 parts per million (ppm) Geochemistry.csv B_ppm Boron concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -10 53 parts per million (ppm) Geochemistry.csv Ba_ppm Barium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 58 2447 parts per million (ppm) Geochemistry.csv Be_ppm Beryllium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -5 6 parts per million (ppm) Geochemistry.csv Bi_ppm Bismuth concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.1 2.1 parts per million (ppm) Geochemistry.csv Cd_ppm Cadmium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.2 0.4 parts per million (ppm) Geochemistry.csv Ce_ppm Cerium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 12.2 671 parts per million (ppm) Geochemistry.csv Co_ppm Cobalt concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.8 58.4 parts per million (ppm) Geochemistry.csv Cr_ppm Chromium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -10 1257 parts per million (ppm) Geochemistry.csv Cs_ppm Cesium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.2 22.3 parts per million (ppm) Geochemistry.csv Cu_ppm Copper concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -10 799 parts per million (ppm) Geochemistry.csv Dy_ppm Dysprosium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.33 15.91 parts per million (ppm) Geochemistry.csv Er_ppm Erbium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.23 11.33 parts per million (ppm) Geochemistry.csv Eu_ppm Europium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.26 10.05 parts per million (ppm) Geochemistry.csv Ga_ppm Gallium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 10 55 parts per million (ppm) Geochemistry.csv Gd_ppm Gadolynium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.49 26.83 parts per million (ppm) Geochemistry.csv Ge_ppm Germanium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -1 8 parts per million (ppm) Geochemistry.csv Hf_ppm Hafnium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 1 14 parts per million (ppm) Geochemistry.csv Ho_ppm Holmium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.06 3.54 parts per million (ppm) Geochemistry.csv In_ppm Indium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.2 0.6 parts per million (ppm) Geochemistry.csv La_ppm Lanthanum concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 5.2 339 parts per million (ppm) Geochemistry.csv Li_ppm Lithium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -10 116 parts per million (ppm) Geochemistry.csv Lu_ppm Lutetium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.05 1.78 parts per million (ppm) Geochemistry.csv Mn_ppm Manganese concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 38 3302 parts per million (ppm) Geochemistry.csv Mo_ppm Molybdenum concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -2 5 parts per million (ppm) Geochemistry.csv Nb_ppm Niobium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 1 30 parts per million (ppm) Geochemistry.csv Nd_ppm Neodymium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 5 274 parts per million (ppm) Geochemistry.csv Ni_ppm Nickel concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -5 416 parts per million (ppm) Geochemistry.csv Pb_ppm Lead concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -5 130 parts per million (ppm) Geochemistry.csv Pr_ppm Praseodymium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 1.5 72.88 parts per million (ppm) Geochemistry.csv Rb_ppm Rubidium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 2.8 326 parts per million (ppm) Geochemistry.csv Re_ppm Rhenium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.02 -0.02 parts per million (ppm) Geochemistry.csv Sb_ppm Antimony concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.1 2.5 parts per million (ppm) Geochemistry.csv Sc_ppm Scandium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -5 44 parts per million (ppm) Geochemistry.csv Se_ppm Selenium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -1 1 parts per million (ppm) Geochemistry.csv Sm_ppm Samarium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.9 42.4 parts per million (ppm) Geochemistry.csv Sn_ppm Tin concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -1 11 parts per million (ppm) Geochemistry.csv Sr_ppm Strontium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 24 1037 parts per million (ppm) Geochemistry.csv Ta_ppm Tantalum concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.5 2.8 parts per million (ppm) Geochemistry.csv Tb_ppm Terbium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.07 2.82 parts per million (ppm) Geochemistry.csv Te_ppm Tellerium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.05 0.07 parts per million (ppm) Geochemistry.csv Th_ppm Thorium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.2 59.9 parts per million (ppm) Geochemistry.csv Tl_ppm Thallium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.5 1.8 parts per million (ppm) Geochemistry.csv Tm_ppm Thulium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -0.05 1.72 parts per million (ppm) Geochemistry.csv U_ppm Uranium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.29 19.92 parts per million (ppm) Geochemistry.csv V_ppm Vanadium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -5 366 parts per million (ppm) Geochemistry.csv W_ppm Tungsten concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). -1 4 parts per million (ppm) Geochemistry.csv Y_ppm Yttrium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 1.9 96.4 parts per million (ppm) Geochemistry.csv Yb_ppm Ytterbium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 0.3 11.8 parts per million (ppm) Geochemistry.csv Zn_ppm Zinc concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 6 339 parts per million (ppm) Geochemistry.csv Zr_ppm Zirconium concentration, in parts per million. The value “-9999” indicates that this concentration was not determined.Other negative values indicate that the concentration limit is below the respective detection limit (b.d.l.). 24.6 432 parts per million (ppm) Geochemistry.csv SampleMaterial Material or mineral analyzed (e.g. apatite, zircon, titanite, whole-rock, etc.). NA NA NA Isotopes.csv SampleID Sample number as collected in the field. NA NA NA Isotopes.csv Lab Laboratory name where analyses were conducted. NA NA NA Isotopes.csv Nd143Nd144 Measured present day ratio of 143Nd to 144Nd by mass spectrometry. 0.511435 0.51269 NA Isotopes.csv Nd143Nd144MeasuredUnc Uncertainty for measured ratio of 143Nd to 144Nd reported at the 2-sigma confidence interval. 0.000002 0.000014 NA Isotopes.csv Sr87Sr86Ratio Ratio of Sr87 to Sr86 counted by mass spectrometry. 0.703582 1.000695 NA Isotopes.csv Sr87Sr86RatioUnc2SAbs Two sigma (absolute) uncertainty for ratio of 87Sr to Sr86 counted by mass spectrometry. 0.000006 0.000022 NA Isotopes.csv Pb206Pb204 Ratio of 206Pb to 204Pb. 16.6779 60.0382 NA Isotopes.csv Pb207Pb204 Ratio of 207Pb to 204Pb. 15.4115 18.6472 NA Isotopes.csv Pb208Pb204 Ratio of 208Pb to 204Pb. 37.5622 65.7775 NA Isotopes.csv Pb206Pb204Unc2SAbs Two sigma uncertainty (absolute) on the ratio of 206Pb to 204Pb. 0.0006 0.0042 NA Isotopes.csv Pb207Pb204Unc2SAbs Two sigma uncertainty (absolute) on the ratio of 207Pb to 204Pb. 0.0006 0.0014 NA Isotopes.csv Pb208Pb204Unc2SAbs Two sigma uncertainty (absolute) on the ratio of 208Pb to 204Pb. 0.0014 0.0048 NA Isotopes.csv SampleMaterial Material or mineral analyzed (e.g. apatite, zircon, titanite, whole-rock, etc.). NA NA NA Isotopes.csv InstrumentMethod Type of instrumental analysis used for isotopic measurements. NA NA NA Geochronology.csv SampleID Sample number as collected in the field. NA NA NA Geochronology.csv Analysis_ID Laboratory run identifier assigned by analyst. NA NA NA Geochronology.csv U U concentration in parts per million (ppm). 1 5084 parts per million (ppm) Geochronology.csv Pb206Pb204 Ratio of 206Pb to 204Pb. 500 14785851 NA Geochronology.csv UTh Ratio of U to Th. 0.31 2604.3 NA Geochronology.csv Pb206Pb207 Down hole corrected and sample-standard bracketed 206Pb/207Pb. 3.586 13.634 NA Geochronology.csv Pb206Pb207UncPct Two sigma uncertainty (percent) for final 206Pb/207Pb. 1 55.3 NA Geochronology.csv Pb207U235 Down hole corrected and sample-standard bracketed 207Pb/235U. 0.1 15.9394 NA Geochronology.csv Pb207U235UncPct Two sigma uncertainty (percent) for final 207Pb/235U. 1 68.2 NA Geochronology.csv Pb206U238 Down hole corrected and sample-standard bracketed 206Pb/238U. 0.06522 0.55388 NA Geochronology.csv Pb206U238UncPct Two sigma uncertainty (percent) for final 206Pb/238U. 1 60 NA Geochronology.csv RHOWetherill Correlation coefficient between ratios of 206Pb to 238U and 207Pb to 235U. 0.177 0.998 NA Geochronology.csv Pb206U238Age Final 206Pb/238U age in Mega annum (Ma). 407.3 2841.3 Ma Geochronology.csv Pb206U238AgeUnc Two sigma uncertainty (absolute) for final 206Pb/238U age in Mega annum (Ma). 1 905.6 Ma Geochronology.csv Pb207U235Age Final 207Pb/235U age in Mega annum (Ma). 500 2873.2 Ma Geochronology.csv Pb207U235AgeUnc Two sigma uncertainty (absolute) for final 207Pb/235U age in Mega annum (Ma). 1 594.2 Ma Geochronology.csv Pb207Pb206Age Down hole corrected and sample-standard bracketed 207Pb/206Pb age in Mega annum (Ma). 500 3356 Ma Geochronology.csv Pb207Pb206AgeUnc2S Two sigma uncertainty (absolute) for final 207Pb/206Pb age in Mega annum (Ma). 1 1119 Ma Geochronology.csv PctConcord Percent concordance relative to 206Pb/238U age vs 207Pb/206Pb age, calculated as [206Pb-238U age/207Pb-206Pb age]*100). 15.1 149.4 NA Geochronology.csv SampleMaterial Material or mineral analyzed (e.g. apatite, zircon, titanite, whole-rock, etc.). NA NA NA Geochronology.csv AgeIntpnType Type of interpreted age. NA NA NA Geochronology.csv AgeIntpnClass Interpreted age classification of a sample (crystallization age, eruption age, sedimentation age, etc.). NA NA NA Geochronology.csv AnalysisType Analysis type (e.g. Single crystal, multi crystal, bulk, groundmass). NA NA NA Geochronology.csv DomainAnalyzed Domain analyzed (e.g. core/rim/whole). NA NA NA Geochronology.csv Lab Laboratory name where analyses were conducted. NA NA NA Geochronology.csv InstrumentMethod Type of instrumental analysis. NA NA NA Geochronology.csv ParentRel Description of relationship of this entry to the parent of this entry (examples: individual analysis spots, incremental heating step, individual grain, etc.). NA NA NA The DataDictionary.csv table provides descriptions of all data fields from all tables in the data release. It provides a description of each field, the units for each field, and the minimum and maximum values for each field where applicable. U.S. Geological Survey GS ScienceBase 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data doi.org/10.5066/P1YHZDWZ None 20250917 Ian W Hillenbrand U.S. Geological Survey, ROCKY MOUNTAIN REGION Research Geologist mailing address

Mail Stop 980, W 6th Ave Kipling St

Lakewood CO 80225 US 303-236-1636 303-236-5349 ihillenbrand@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998