Buchanan, J.W.Barrera, M.L.Moshrefzadeh, J.A.Truskowski, C.M.Newberry, R.J.2025spreadsheetRaw Data FileRDF 2025-25Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 p.https://doi.org/10.14509/31731LA-ICP-MS uranium-lead zircon data from samples in the Chena and Steese project areas, Raw Data File 2025-25, provides uranium-lead (U-Pb) geochronologic data and trace and rare earth element (TREE) data from single zircon spots analyzed using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The two methods were run concurrently resulting in U-Pb age data and TREE data from the same zircon volume. Alaska Division of Geological & Geophysical Surveys (DGGS) staff collected zircon data from 51 samples of igneous and meta-igneous rocks primarily collected during the 2024 field season in support of the Earth Mapping Resources Initiative (Earth MRI) Steese and Chena projects. The goal of this dataset is to delineate the age of igneous activity to support geologic mapping efforts, tectonic interpretations, and characterization of mineralization in the Yukon-Tanana Uplands, Alaska. Data are organized in the age summary data table with our interpreted crystallization ages, sample location information, and sample descriptions. The zircon grain data table contains U-Pb isotopic age data and TREE data for each zircon spot analyzed. These data are provided as a Raw Data File under an open end-user license and are available on the DGGS website: http://doi.org/10.14509/31731.This dataset provides U-Pb zircon age data from igneous rocks in Interior Alaska to refine geologic maps, improve understanding of mineralizing systems, and guide resource exploration. By supporting the Earth MRI initiative, it enhances Alaska's ability to evaluate mineral potential, strengthen economic development, and manage natural resources for the benefit of the state.>chena_steese-zircon: Data spreadsheets and accompanying data dictionaries2025ground conditionCompleteNone planned-148.392677-143.81491165.49143664.289053ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysActinoliteAlbiteAllaniteAmphiboleAnalysesAnalyses and SamplingAnalytical Lab ResultsApatiteApliteAugiteBedrockBedrock GeologyBiotiteCalciteChloriteClinopyroxeneClinozoisiteDGGSDikeDioriteDisseminatedEarth MRIEpidoteFeldsparFelsicFluoriteGabbroGeochronologyGeologicGeologyGreenschistIgneousIgneous RocksIsotopesLA-ICPMSLab MethodsMetaigneous UnitsMetamorphicMetamorphic RocksMetamorphismMethodsMineral AssessmentMineral Deposit ModelsMineral DepositsMineral ExplorationMineral LocalitiesMineral ResourcesMineralsRadioactive MineralsRare Earth ElementsResourcesRhyoliteRocksU-PbU-Pb ZirconUraniumZirconAlaska Division of Geological & Geophysical SurveysAlder CreekAmerican CreekApproach HillBarnes CreekBathing Beauty PondBig Windy CreekBirch HillCaribou CreekChena RiverCircle Mining DistrictClear CreekColumbia CreekDawson CreekDeadwood CreekDeep CreekFairbanksFairbanks Mining DistrictFar MountainFlat CreekFrench CreekGilmore DomeGoodpaster Mining DistrictHope CreekLundgren PondMarten CreekMastadon CreekMelba CreekMonte Cristo CreekMonument CreekMoose CreekMunson CreekMurphy DomeOttertail CreekPortage CreekRock CreekSerpentine CreekShovel CreekSilver CreekSourdough CreekStuart CreekSwitch CreekTable MountainTanana RiverTolovana Mining DistrictWigwam CreekWolf CreekWoodchopper CreekYukon-Tanana UplandWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaAlbianAptianCampanianCenomanianCenozoicEoceneMaastrichtianMesozoicMississippianOrdovicianPaleocenePaleozoicThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.The authors thank the University of Arizona LaserChron Center staff for their contributions to data collection, technical discussions, and other support. The analytical work was funded by the U.S. Geological Survey's Earth Mapping Resources Initiative (Earth MRI) under cooperative agreement G24AC00323 and by the State of Alaska. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.Moshrefzadeh, J.A.Newberry, R.J.2025Raw Data FileRDF 2025-13Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys6 phttps://doi.org/10.14509/31537Moshrefzadeh, J.A.Buchanan, J.W.Naibert, T.J.Twelker, EvanNewberry, R.J.Szumigala, D.J.Barrera, M.L.Norwood, L.P.Acosta, M.D.Regan, S.P.2025Raw Data FileRDF 2025-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 phttps://doi.org/10.14509/31476Moshrefzadeh, JamshidAcosta, M.D.Barrera, M.L.Buchanan, J.W.Naibert, T.J.Newberry, R.J.Norwood, L.P.Regan, S.P.Szumigala, D.J.Twelker, Evan2025Raw Data FileRDF 2025-17Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/31692The accompanying report and data tables provide a comprehensive discussion of processing methods, with errors reported in the tables where applicable. This data is being released as part of the DGGS RDF series, which includes content describing approved techniques and methods for the collection, storage, visualization, analysis, and interpretation of scientific data. While the information has been reviewed by several geologists familiar with the study area, the data and report have not undergone formal review for technical content or conformity to DGGS editorial standards. For inquiries regarding analytical values or procedures, the originating lab is the best point of contact.Not applicableThis data release is complete.Location data for field stations were collected using GPS-enabled tablets or smartphones running the Esri Field Maps app. Data were merged into an ArcGIS geodatabase. The devices have a reported error of 10-12 m.Sample selection - Field staff collected fresh, unaltered felsic to intermediate igneous rocks (e.g., granite, rhyolite, porphyry dikes) and, in metamorphic terrains orthogneiss or felsic layers likely to contain zircon. Approximately 2-3 kg of material was sampled from unweathered interiors, avoiding heavily altered rocks. Each sample location was documented with GPS coordinates, lithologic descriptions, and geologic context including contacts and intrusive relationships. Samples were later processed to separate zircon grains for U-Pb geochronology and trace/rare earth element analysis using LA-ICP-MS.2025Analytical methods - Samples were processed to separate zircon grains for U-Pb geochronology and trace and rare earth element (TREE) analysis using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Analytical procedures followed established techniques described by Gehrels et al. (2008), Gehrels and Pecha (2014), Pullen et al. (2018), and Sundell et al. (2021). Additional details on laboratory methods and data reduction are provided in the accompanying report.2025point0.00000010.0000001decimal degreesNAD83GRS 806378137298.257222101rdf2025-25_chena_steese-zircon_grain_data.csv, rdf2025-25_chena_steese-zircon_grain_data_dictionary.csv, rdf2025-25_chena_steese-zircon-age_summary.csv, rdf2025-25_chena_steese-zircon-age_summary_data_dictionary.csvData spreadsheets and accompanying data dictionariesDGGSchena_steese-zirconAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.RDF 2025-25The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.Contact DGGS for current pricingspreadsheet20251117tablehttps://doi.org/10.14509/31731Free download20251117Alaska Division of Geological & Geophysical SurveysSimone MontayneMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.https://dggs.alaska.gov/metadata/dggs.extdggs metadata extensions