LA-ICP-MS uranium lead geochronologic data of zircon from igneous and meta-igneous rocks in the Mount Harper project area, Eagle, Tanacross, Mount Hayes, and Big Delta quadrangles, Alaska

Buchanan, J.W.Gavel, M.M.Wildland, A.D.Newberry, R.J.2025LA-ICP-MS uranium lead geochronologic data of zircon from igneous and meta-igneous rocks in the Mount Harper project area, Eagle, Tanacross, Mount Hayes, and Big Delta quadrangles, AlaskaspreadsheetRaw Data FileRDF 2025-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 p.https://doi.org/10.14509/31552LA-ICP-MS uranium lead geochronologic data of zircon from igneous and meta-igneous rocks in the Mount Harper project area, Eagle, Tanacross, Mount Hayes, and Big Delta quadrangles, Alaska, Raw Data File 2025-4, provides uranium-lead (U-Pb) geochronologic data from single zircon spots, analyzed using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Alaska Division of Geological & Geophysical Surveys (DGGS) staff collected zircon data from 31 samples of igneous and meta-igneous rocks, primarily selected during the 2022 field season in support of the Earth Mapping Resources Initiative (Earth MRI) Mount Harper project. Three of these samples were analyzed to support geologic interpretation in the Taylor Mountain map area. One sample was collected during the 2018 field season in support of the Richardson mining district mapping project, which has since been incorporated into the Mount Harper project area. The goal of this dataset is to determine the age of igneous activity to support geologic mapping efforts, tectonic interpretations, and characterization of mineralization in the Yukon-Tanana Uplands of Interior Alaska. Crystallization age 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 isotopic and elemental data for each zircon spot analyzed. Both tables have accompanying data dictionaries. These data and report are available from the DGGS website: http://doi.org/10.14509/31552.The goal of this dataset is to determine the age of igneous activity to support geologic mapping efforts, tectonic interpretations, and characterization of mineralization in the Yukon-Tanana Uplands of Interior Alaska.>data: Analytical lab data and accompanying data dictionary >sample-summary: Summary data spreadsheet and accompanying data dictionary20182025ground conditionCompleteNone planned-146.532882-142.01985864.46410063.777042ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysActinoliteAge DatesAllaniteAnalysesAnalyses and SamplingAnalytical Lab ResultsAnalytical ResultsBedrockBedrock GeologyCalciteChloriteDGGSDikeDioriteEarth MRIEconomic GeologyEpidoteExplorationFeldsparFelsicGabbroGarnetGeochronologyGeologicGeologyGraniteGranodioriteGreenschistHornblendeIgneousIgneous RocksLab MethodsMetamorphicMetamorphic DepositMetamorphic RocksMetamorphismMethodsMineral ExplorationMineral ResourcesMineralsPlutonicPlutonic RocksPlutonsResource AssessmentResource InformationResourcesRocksSample LocationSample Location MapStrategic MineralsU-PbAlaska Division of Geological & Geophysical SurveysBig Swede CreekBilly CreekBirch LakeBoulder CreekBuckskin CreekCanyon CreekCentral CreekClearwater CreekCorda CreekDemocrat CreekDivide CreekEagle CreekEnterprise CreekFairbanks Mining DistrictFish CreekFortymile Mining DistrictGerstle RiverGold CreekGold RunGold Run CreekGoodpaster Mining DistrictGoodpaster RiverGunnysack CreekHealy RiverJoseph CreekJunction CreekLenant CreekLogging Cabin CreekMichigan CreekMinton CreekMolly CreekMonte Cristo CreekMoose CreekMosquito CreekMount HarperPorphyry CreekProgressive CreekRapid CreekRedmond CreekRichardson Mining DistrictSalcha RiverSand CreekSand LakeSerpentine CreekSevenmile CreekShamrock CreekShaw CreekShaw Creek DomeT LakeTanana RiverTaylor CreekTenmile CreekTwentyfive Mile CreekUncle Sam CreekVolkmar LakeVolkmar RiverWhite CreekWillow CreekWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaEarly CarboniferousEarly CretaceousEarly JurassicLate CretaceousLate DevonianPaleoceneThis 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

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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 GeoSep Services, LLC and the University of Arizona LaserChron Center staff for their contributions to data collection, technical discussion, and other support. The analytical work was funded by the U.S. Geological Survey's Earth Mapping Resources Initiative (Earth MRI) under cooperative agreement G22AC00288 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.Buchanan, J.W.Wypych, AlicjaBarrera, M.L.Biegel, J.M.Gavel, M.M.Harvey, D.A.Ketcham, R.A.Muller, I.P.Naibert, T.J.Newberry, R.J.Regan, S.P.Szumigala, D.J.Twelker, EvanWildland, A.D.2025Geochemical data from samples collected in 2023 for the Chena and Mount Harper projects, Big Delta, Circle, Fairbanks, and Eagle quadrangles, AlaskaRaw Data FileRDF 2024-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 phttps://doi.org/10.14509/31123Emond, A.M.Twelker, Evan2022DGGS's completed Yukon-Tanana Upland Earth MRI airborne geophysics program and CY 2023 Mag, Rad, and EM acquisition plans (presentation): Alaska Miners Association Annual Meeting, Anchorage, Alaska, November 8-10, 2022Poster and PresentationEmond, A.M. and Twelker, Evan, 2022Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys31 phttps://doi.org/10.14509/30911Gavel, M.M.Twelker, EvanWypych, AlicjaNaibert, T.J.Newberry, R.J.Szumigala, D.J.Wildland, A.D.Barrera, M.L.Biegel, J.N.Harvey, D.A.Ketcham, R.A.Muller, I.P.Regan, S.P.2023Field station locations and magnetic susceptibility data for the Chena-Pogo and Mount Harper projects, Big Delta and Circle quadrangles, Alaska, collected June-September 2023Raw Data FileRDF 2023-27Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/31096Gavel, M.M.Twelker, EvanWypych, AlicjaNaibert, T.J.Newberry, R.J.Szumigala, D.J.Wildland, A.D.Barrera, M.L.Blackwell, N.J.Fessenden, S.N.Harvey, D.A.Muller, I.P.2023Field station locations and magnetic susceptibility data collected in 2022 for the Mount Harper project, Eagle, Big Delta, and Mount Hayes quadrangles, AlaskaRaw Data FileRDF 2023-6Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/30963Naibert, T.J.Wypych, AlicjaTwelker, EvanGavel, M.M.Wildland, A.D.Newberry, R.J.Szumigala, D.J.Barrera, M.L.Fessenden, S.N.2022Updates on DGGS geologic mapping efforts in eastern Interior Alaska (presentation): Alaska Miners Association annual convention, Anchorage, Alaska, November 8, 2022Poster and PresentationNaibert, T.J. and others, 2022Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys27 phttps://doi.org/10.14509/30910Truskowski, C.M.Heizler, M.T.Naibert, T.J.Newberry, R.J.Twelker, EvanSzumigala, D.J.202540Ar/39Ar geochronology data from the Big Delta, Eagle, and Mount Hayes quadrangles, AlaskaRaw Data FileRDF 2025-11Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys21 phttps://doi.org/10.14509/31534Wypych, AlicjaTwelker, EvanNaibert, T.J.Gavel, M.M.Newberry, R.J.Szumigala, D.J.Wildland, A.D.Barrera, M.L.Harvey, D.A.Muller, I.P.Fessenden, S.N.Blackwell, N.J.2023Geochemical data from samples collected in 2022 for the Mount Harper geologic mapping project, Big Delta, Mount Hayes, and Eagle quadrangles, AlaskaRaw Data FileRDF 2023-24Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/31089The 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.Sample location coordinates (in WGS84 datum) were collected using GPS-enabled field tablets with a typical reported accuracy of +/- 10 meters.Sample collection - Alaska Division of Geological & Geophysical Surveys (DGGS) staff collected zircon data from 31 samples of igneous and meta-igneous rocks, primarily selected during the 2022 field season in support of the Earth Mapping Resources Initiative (Earth MRI) Mount Harper project. Three of these samples were analyzed to support geologic interpretation in the Taylor Mountain map area. One sample was collected during the 2018 field season in support of the Richardson mining district mapping project, which has since been incorporated into the Mount Harper project area. DGGS field geologists collected fresh, unweathered samples from surface outcrops and hand-dug pits that exposed fragmented bedrock, selecting them to represent the characteristic lithology or intrusive body.2022Analytical methods - This report includes single-grain zircon data generated by GeoSep Services, LLC (GeoSep) and data collected from samples analyzed by DGGS geologists at the Arizona LaserChron Center (ALC) at the University of Arizona. Whole-rock samples were sent to GeoSep and ALC, and each laboratory performed zircon extraction, ran or oversaw the running of analytical data collection, and performed the raw data reduction. The accompanying report provides additional detail about the methods used by each labratory.2023point0.00000010.0000001decimal degreesWGS84WGS 846378137298.257223563rdf2025_4_zircon_grain_data.csv, rdf2025_4_zircon_grain_data_data_dictionary.csvAnalytical lab data and accompanying data dictionaryDGGS, GeoSep Services, LLC, and Arizona LaserChron Centerdatardf2025_4_crystallization_age_summary.csv, rdf2025_4_crystallization_age_summary_data_dictionary.csvSummary data spreadsheet and accompanying data dictionaryDGGSsample-summaryAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

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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