{"action":"create","ckan_id":null,"date_created":"Wed, 28 Jan 2026 04:45:46 GMT","date_finished":null,"harvest_job_id":"57389b8d-43cf-462e-ae72-8757a66f3509","harvest_source_id":"f4c7bbab-c7ef-4277-a7d3-c25b78854814","id":"c0e8f934-e2ac-4615-b858-4ff3d86b2322","identifier":"https://dggs.alaska.gov/webpubs/metadata/RI2016-5-ar-ar.xml","parent_identifier":null,"source_hash":"c65720c0178ac499b54d414d60f0e660edc3b22a11eed404f10781111b55e029","source_raw":"\n\n\n\n\nTwelker, Evan\nAthey, J.E.\nNewberry, R.J.\nGriesel, G.A.\nSzumigala, D.J.\nFreeman, L.K.\nElliott, B.A.\nWerdon, M.B.\nStevens, D.S.P.\n2016\nGeologic map of portions of the Livengood B-3, B-4, C-3, and C-4 quadrangles, Tolovana mining district, Alaska\nreport and digital data\n\nReport of Investigation\nRI 2016-5\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n39 p., 1 sheet, scale 1:63,360.\nhttp://dx.doi.org/10.14509/29665\n\n\n\nThis data file presents 40Ar/39Ar step-heating geochronology results for a granite sample from the Livengood mining district. The Livengood area is a historically productive placer mining area approximately 80 road miles north of Fairbanks, Alaska. This data is a component of a geologic map and accompanying report that synthesizes recently collected and previously published agency and industry geologic data in a 1:50,000-scale comprehensive geologic map to build a better understanding of the geology and mineral-resource potential of the Livengood area.\nThis data file presents 40Ar/39Ar step-heating geochronology results for a granite sample from the Livengood mining district.\n\n>arar-summary-data-locations: Identification numbers, coordinates, sample descriptions, and summary ages of each sample\n>step-heating-data: Power output levels and resultant measurements from each sample run\n\n\n\n\n\n2010\n\n\nground condition\n\n\ncomplete\nNone planned\n\n\n\n-148.56559\n-148.56559\n65.44400\n65.44400\n\n\n\n\nISO 19115 Topic Category\ngeoscientificInformation\n\n\nAlaska Division of Geological & Geophysical Surveys\n40Ar/39Ar\nAirborne Geophysical/Geological Mineral Inventory\nBedrock\nBedrock Geology\nCopper\nEolian\nFossils\nGeochemistry\nGeochronology\nGeologic Map\nGold\nIgneous Rocks\nMan-Made Deposits\nMetamorphic Rocks\nPlutonic Rocks\nSTATEMAP Project\nSedimentary Rocks\nSilver\nSurficial Geology\nTailings\n\n\nAlaska Division of Geological & Geophysical Surveys\nCascaden Ridge\nLivengood\nLivengood Bench\nLivengood Quadrangle\nMoney Knob\nRanney Hollow\nShorty Creek\nTolovana Mining District\nTolovana River\n\n\nAlaska Division of Geological & Geophysical Surveys\nAmy Creek Assemblage\nCascaden Ridge Unit\nLivengood Dome Chert\nLivengood Terrane\nLost Creek Unit\nRampart Group\nVictoria Creek Fault\nWickersham Unit\nWilber Creek Unit\n\n\nWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America\nCambrian\nCenozoic\nCretaceous\nDevonian\nHolocene\nMesozoic\nMississippian\nOrdovician\nPaleozoic\nPermian\nPleistocene\nPliocene\nProterozoic\nQuaternary\nSilurian\nTertiary\nTriassic\n\n\nThis 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).\nAny 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.\n\n\n\nAlaska Division of Geological & Geophysical Surveys\n\nGIS Manager\n\nmailing and physical\n
3354 College Rd
\nFairbanks\nAK\n99709-3707\nUSA\n\n907-451-5020\ndggsgis@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\n\n\nThis project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the 2003 geologic mapping was also provided by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP award number 03HQAG0055. The accompanying report provides additional acknowledgements to a multitude of people for their various contributions to this map.\n\n\n\nThis publication is a final report of research and has received two technical reviews as well as technical editing. Questions regarding the accuracy of information can be best answered by the originating lab.\n\nnot applicable\nThis data release is complete.\n\n\nLocations were recorded using handheld GPS devices. Location errors reported by the GPS were not recorded.\n\n\n\n\nFieldwork - Fresh, unweathered samples from surficial outcrops were collected by DGGS field geologists; samples were selected based on presence of sufficiently large crystals and/or fresh glassy matrix.\n2010\n\n\nSample preparation and analysis - Before processing, samples were examined under binocular microscope, or thin sections were prepared and scrutinized to eliminate the possibility of analyzing altered mineral phases. Rock samples that we found to be suitable for dating by 40Ar/39Ar geochronology analysis were submitted to the Geochronology Laboratory at the University of Alaska Fairbanks (UAF) where they were dated according to the protocols outlined in the accompanying report.\n2010\n\n\n\n\npoint\n\n\n\n\n0.00001\n0.00001\ndecimal degrees\n\n\nWorld Geodetic System of 1984\nWGS 84\n6378137\n298.257223563\n\n\n\n\n\n\nri2016-5-arar-summary-data-locations.csv\nIdentification numbers, coordinates, sample descriptions, and summary ages of each sample\nAlaska Division of Geological & Geophysical Surveys\narar-summary-data-locations\n\n\nSAMPLE\nLabel assigned in the field to identify the sample.\nAlaska Division of Geological & Geophysical Surveys\n\nGeneric example of a sample identifier: YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.\n\n\n\nLAB_SAMPLE_NUMBER\nLabel used by the lab to identify the sample.\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe lab sample number is typically identical to the field sample number. However, in some cases, the sample number provided by the lab does differ from the number assigned in the field. We provide both numbers to document instances in which the sample numbers in the lab files differ from the field sample number.\n\n\n\nNULL\nBlank (NULL) values indicate that the lab sample number is identical to the field sample number.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\nCOLLECTOR\nThe geologist who collected the sample.\nAlaska Division of Geological & Geophysical Surveys\n\nThe samples presented in this report were collected by the authors or other DGGS staff.\n\n\n\nLONGITUDE\nLongitude, WGS84\nAlaska Division of Geological & Geophysical Surveys\n\n\n-148.56559\n-148.56559\ndecimal degrees\n\n\n\n\nLATITUDE\nLatitude, WGS84\nAlaska Division of Geological & Geophysical Surveys\n\n\n65.44400\n65.44400\ndecimal degrees\n\n\n\n\nDATED_MATERIAL\nIndicates the type of material that was used for analysis\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe type of material that was selected for dating varied according to mineral composition and grainsize of the submitted rock sample. This field specifies whether the age was derived from a mineral separate (generally 1 to 10 individual crystals dated together as a single run), a single crystal, or the whole rock.\n\n\n\nMINERAL\nIndicates the mineral that was used for analysis\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe minerals selected for dating would typically be grains of biotite, hornblende, or muscovite.\n\n\n\nNULL\nA NULL or blank values indicates that the sample was a whole rock or that the mineral type was not recorded by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nDESCRIP_1\nDescription of the sample\nAlaska Division of Geological & Geophysical Surveys\n\nCharacters 1 to 254 of a brief sample or station description.\n\n\n\nNULL\nWe do not provide a description of the sample.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\nDESCRIP_2\nExtension of the sample or station description for descriptions which are greater than 254 characters in length\nAlaska Division of Geological & Geophysical Surveys\n\nCharacters greater than 254 of the sample or station description.\n\n\n\nNULL\nBlank (NULL) values indicate that the descriptive text is shorter than 254 characters.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\nDESCRIP_3\nExtension of the sample or station description for descriptions which are greater than 509 characters in length\nAlaska Division of Geological & Geophysical Surveys\n\nCharacters greater than 509 of the sample or station description.\n\n\n\nNULL\nBlank (NULL) values indicate that the descriptive text is shorter than 509 characters.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\nINTEGRATED_AGE_MA\nIntegrated age and age error in million years\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe values are a concatenation of the integrated age determination and the calculated error associated with the integrated age determination\n\n\n\nNULL\nA NULL or blank values indicates that the INTEGRATED_AGE_MA value was not calculated by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nPLATEAU_AGE_MA\nPlateau age and age error in million years\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe values are a concatenation of the plateau age determination and the calculated error associated with the plateau age determination\n\n\n\nNULL\nA NULL or blank values indicates that the PLATEAU_AGE_MA value was not calculated by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nPLATEAU_REMARKS\nComments and additional values that pertain to the plateau age determination method or interpretation.\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nFree text\n\n\n\nNULL\nA NULL or blank values indicates that the PLATEAU_REMARKS value was not provided by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nW_M_AGE_MA\nWeighted mean age and age error in million years\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe values are a concatenation of the weighted mean age determination and the calculated error associated with the weighted mean average age determination\n\n\n\nNULL\nA NULL or blank values indicates that the W_M_AGE_MA value was not calculated by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nW_M_AGE_REMARKS\nComments and additional values that pertain to the weighted mean age determination method or interpretation.\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nFree text\n\n\n\nNULL\nA NULL or blank values indicates that the W_M_AGE_REMARKS value was not provided by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nISOCHRON_AGE\nIsochon age and age error in million years\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe values are a concatenation of the isochron age determination and the calculated error associated with the isochron age determination\n\n\n\nNULL\nA NULL or blank values indicates that the ISOCHRON_AGE value was not provided by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nISOCHRON_REMARKS\nComments and additional values that pertain to the isochron age determination method or interpretation.\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nFree text\n\n\n\nNULL\nA NULL or blank values indicates that the ISOCHRON_REMARKS value was not provided by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nAGE_TYPE_PREFERRED\nIndicates AGE_TYPE_PREFERRED age.\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nA discussion of the preferred age for each analysis is provided in the accompanying lab report. The possible values are: plateau, isochron, weighted average, or integrated.\n\n\n\nPREFERRED_AGE\nThe values are a concatenation of the preferred age determination and the calculated error associated with the preferred age determination\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe preferred age for each analysis is discussed in detail in the accompanying lab report.\n\n\n\n\n\nri2016-5-step-heating-data.csv\nPower output levels and resultant measurements from each sample run\nAlaska Division of Geological & Geophysical Surveys\nstep-heating-data\n\n\nSAMPLE\nLabel assigned in the field to identify the sample.\nAlaska Division of Geological & Geophysical Surveys\n\nGeneric example of a sample identifier: YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.\n\n\n\nLAB_SAMPLE_NUMBER\nLabel used by the lab to identify the sample.\nAlaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nThe lab sample number is typically identical to the field sample number. However, in some cases, the sample number provided by the lab does differ from the number assigned in the field. We provide both numbers to document instances in which the sample numbers in the lab files differ from the field sample number.\n\n\n\nLaser_mW\nLaser output level in megawatts\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n300\n9000\nmegawatts\n\n\n\n\nNULL\nA NULL or blank values indicates that the values in the row were calculated by weighting the individual heating steps by the fraction of 39Ar released.\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nIntegrated\nWe indicate whether the values in the row were derived from a heating step or calculated by weighting the individual heating steps by the fraction of 39Ar released.\nAlaska Division of Geological & Geophysical Surveys\n\n\nNULL\nThe values in the row were derived from a heating step\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nCum39Ar\nCumulative ratio of 39Argon released at this step\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.003\n1\n\n\n\n\nNULL\nThe values in the row were derived from a heating step\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nMe40Ar39Ar\nMeasured 40Ar/39Ar ratio for each heating step, corrected for blank and 39Ar decay\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n9.26611\n58.7971\n\n\n\n\nEr40Ar39Ar\nThe one sigma error for each 40Ar/39Ar measurement\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.0929\n1.07646\n\n\n\n\nMe37Ar39Ar\nThe ratio of measured 37Ar to measured 39Ar for each heating interval for each sample corrected for blank and 37Ar and 39Ar decay\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.00027\n0.01922\n\n\n\n\nEr37Ar39Ar\nThe one sigma error for each 37Ar/39Ar measurement\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.00009\n0.01166\n\n\n\n\nMe36Ar39Ar\nRatio of measured 36Ar to measured 39Ar for each step interval for each sample corrected for blank and 39Ar decay\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n-0.00161\n0.18204\n\n\n\n\nEr36Ar39Ar\nThe one sigma error for each 36Ar/39Ar measurement\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.00003\n0.00533\n\n\n\n\nAtm40Ar\nPercent of 40Ar which is atmospheric in composition at each step level\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n-5.1838\n91.53631\n\n\n\n\nErAtm40Ar\nThe one sigma error for the percent of 40Ar which is atmospheric in composition at each step level\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.09464\n3.69652\n\n\n\n\nMeCaK\nRatio of Calcium to Potassium as determined from 37Ar/39Ar\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.00049\n0.03526\n\n\n\n\nErCaK\nThe one sigma error for each Ca/K determination\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.00017\n0.0214\n\n\n\n\nMeClK\nRatio of Chlorine to Potassium as determined from 38Ar/39Ar\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.0261\n0.03332\n\n\n\n\nErClK\nThe one sigma error for each Cl/K determination\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.00038\n0.00118\n\n\n\n\nEr40ArRad39ArK\nOne sigma error for each 40ArRad/39ArK value\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.09232\n1.66349\n\n\n\n\nAgeMa\nCalculated age for each temperature step for each sample\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n34.61\n68.65\nMA\n\n\n\n\nErAgeMa\nOne sigma error of the age determination of each heating step\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.62\n11.47\nMA\n\n\n\n\nWeightedAverageOfJFromStandards\nJ value, calculated from the weighted average of standards placed in various positions in the nuclear reactor\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\nWeightedAverageOfJFromStandards value and error\n\n\n\n\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\n\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\n(907)451-5050\ndggspubs@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\nPlease view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.\n\n\nRI 2016-5\nThe 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.\n\nDGGS 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.\nContact DGGS for current pricing\n\n\n\n\nASCII tabular files\n\n\n\n\n\nhttp://dx.doi.org/10.14509/29665\n\n\n\n\n\nFree download\n\n\n\n20161130\n\n\n\nAlaska Division of Geological & Geophysical Surveys\n\nMetadata Manager\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\n\n\nFGDC Content Standard for Digital Geospatial Metadata\nFGDC-STD-001-1998\nIf 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.\n\nhttp://www.dggs.alaska.gov/metadata/dggs.ext\ndggs metadata extensions\n\n\n\n","source_transform":null,"status":"error"}