{"action":"create","ckan_id":null,"date_created":"Sat, 21 Mar 2026 21:02:11 GMT","date_finished":null,"harvest_job_id":"79726ef4-fe9d-44a6-97a0-95f49b8db61f","harvest_source_id":"31f41541-38a0-400b-b240-10ebcb0acd9a","id":"4712f340-428c-4aa3-b28c-8e6bb14026b6","identifier":"https://dggs.alaska.gov/webpubs/metadata/RDF2018-3.xml","parent_identifier":null,"source_hash":"ddb6e84db7014f1f89b0dce0c8cbb13450c19dd2f390dae301e5b585563c4a04","source_raw":"\n\n\n\n\nNaibert, T.J.\nBenowitz, J.A.\nWypych, Alicja\nSicard, K.R.\nTwelker, Evan\n2018\n40Ar/39Ar data from the Tanacross D-1 and D-2, Big Delta B-4 and B-5, and Mount Hayes A-6 quadrangles, Alaska\nreport and digital data\n\nRaw Data File\nRDF 2018-3\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n15 p.\nhttp://doi.org/10.14509/30112\n\n\n\nThis report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the Alaska Division of Geological & Geophysical Surveys' (DGGS) geologic mapping projects in the Northeastern Tanacross map area in the Tanacross D-1 and D-2 quadrangles, the Richardson map area in the Big Delta B-4 and B-5 quadrangles, and the Wrangellia map area in the Mount Hayes A-6 Quadrangle. Field samples were collected by the DGGS Mineral Resources section during detailed geologic mapping campaigns in 2013 and 2017. The complete report and digital data are available through the DGGS website: http://doi.org/10.14509/30112.\nThe Northeastern Tanacross map area lies within the Yukon-Tanana terrane on the boundary between the Fortymile and Lake George Assemblages. The map area encompasses documented porphyry Cu-Mo-Au deposits including Taurus, Fishhook (also known as SW Pika), and Pika Canyon, and is adjacent to the Fortymile Mining District. Previously published geologic mapping includes a reconnaissance 1:250,000-scale map and a slightly modified map published by the USGS. New DGGS mapping will provide detailed geologic context for the known porphyry systems in the map area and links to mineral occurrences elsewhere in the region, including across the border in Yukon, Canada. The Richardson project area in Interior Alaska is approximately 30-50 miles west of the active Pogo gold mine and includes several active intrusion-related gold exploration properties, including Naosi, Uncle Sam, and Democrat Lode. Recent DGGS geologic mapping will improve the understanding of the area's geology and controls on gold mineralization to facilitate industry exploration targeting. The Wrangellia project area lies along the Denali Highway in the eastern Wrangellia Terrane, which includes magmatic sulfide nickel-copper-cobalt and platinum-group element mineralization hosted in mafic-ultramafic rocks in a structurally complex geologic setting. The sample presented in this report comes from the Clearwater Terrane, an isolated region of metamorphic rock with Permian protoliths caught up in the regional Talkeetna Shear Zone.\n\n>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\n2013\n2017\n\n\nground condition\n\n\ncomplete\nNone planned\n\n\n\n-146.928045\n-141.279735\n64.466044\n63.196416\n\n\n\n\nISO 19115 Topic Category\ngeoscientificInformation\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\nMetadata Manager\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\n\n\nThe DGGS 2017 Northeastern Tanacross and Richardson projects were funded through State of Alaska general funds. The Wrangellia project was funded by Capital Improvement Project funds through the State's Strategic and Critical Minerals Assessment project. The authors acknowledge the contributions of the 2017 Richardson and Northeastern Tanacross project field crew: Melanie B. Werdon, Jen E. Athey, Amanda L. Willingham, Alec C. Lockett, and the 2013 Wrangellia field crew: Larry K. Freeman, Rainer J. Newberry, Erik N. Bachmann, David A. Reioux, Amy L. Tuzzolino, and T. Colby Wright.\n\n\nBenowitz, J.A.\nLayer, P.W.\nTwelker, Evan\n2014\n40Ar/39Ar data from rocks collected in 2013 in the Wrangellia mineral assessment area, Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles, Alaska\n\nRaw Data File\nRDF 2014-18\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n10 p\nhttp://doi.org/10.14509/29119\n\n\n\n\nTwelker, Evan\nNewberry, R.J.\nFreeman, L.K.\nSicard, K.R.\nReioux, D.A.\nBachmann, E.N.\n2013\nDGGS geologic and mineral-resource assessment of the western Wrangellia terrane, central Alaska: Initial progress report (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 4-10, 2013\n\nPoster and Presentation\nTwelker, Evan and others, 2013\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n25 p\nhttp://doi.org/10.14509/26821\n\n\n\n\nTwelker, Evan\nWypych, Alicja\nNewberry, R.J.\n2014\nNew data and insight on the Late Triassic Wrangellia magmatic Ni-Cu-Co-PGE system in the Talkeetna Mountains, central Alaska (poster): Society of Economic Geologists 2014 Conference, September 27-30, 2014\n\nPoster and Presentation\nTwelker, Evan and others, 2014\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet\nhttp://doi.org/10.14509/29139\n\n\n\n\nWypych, Alicja\nTwelker, Evan\nFreeman, L.K.\nLande, Lauren\nNewberry, R.J.\nReioux, D.A.\nSicard, K.R.\n2015\nMajor-oxide and trace-element geochemical data from rocks collected in 2015 in the Wrangellia mineral assessment area, Alaska\n\nRaw Data File\nRDF 2015-16\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n4 p\nhttp://doi.org/10.14509/29518\n\n\n\n\nTwelker, Evan\nBurns, L.E.\n2014\nNew geochemical and geophysical data from the western Wrangellia minerals assessment area (presentation): Alaska Miners Association 24th Biennial Mining Conference, Fairbanks, Alaska April 7-13, 2014\n\nPoster and Presentation\nTwelker, Evan and Burns, L.E., 2014\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n34 p\nhttp://doi.org/10.14509/27284\n\n\n\n\nWypych, Alicja\nTwelker, Evan\nLande, L.L.\nNewberry, R.J.\n2015\nAlong-strike geochemical variations in the Late Triassic Nikolai magmatic system, Wrangellia, central Alaska (poster number V31D-3059): American Geophysical Union 2015 Fall Meeting, December 14-18, 2015\n\nPoster and Presentation\nWypych, Alicja and others, 2015\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet\nhttp://doi.org/10.14509/29567\n\n\n\n\nBenowitz, J.A.\nLayer, P.W.\nWypych, Alicja\nTwelker, Evan\n2017\n40Ar/39Ar data from rocks collected in the 2015 Wrangellia mineral assessment project area, Mount Hayes A-5, Mount Hayes B-6, and Talkeetna Mountains D-2 quadrangles, Alaska\n\nRaw Data File\nRDF 2017-1\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n9 p\nhttp://doi.org/10.14509/29699\n\n\n\n\nTwelker, Evan\nLande, Lauren\n2015\nDGGS geological investigations in western Wrangellia (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 1-5, 2015\n\nPoster and Presentation\nTwelker, Evan and Lande, Lauren, 2015\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n45 p\nhttp://doi.org/10.14509/29531\n\n\n\n\nBenowitz, J.A.\nLayer, P.W.\nWypych, Alicja\nTwelker, Evan\n2015\n40Ar/39Ar data from the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska\n\nRaw Data File\nRDF 2015-10\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n19 p\nhttp://doi.org/10.14509/29454\n\n\n\n\nTwelker, Evan\nHubbard, T.D.\nWypych, Alicja\nSicard, K.R.\nNewberry, R.J.\nReioux, D.A.\nFreeman, L.K.\nLande, L.L.\n2015\nGeologic map of the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska\n\nPreliminary Interpretive Report\nPIR 2015-6\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n16 p., 1 sheet, scale 1:50,000\nhttp://doi.org/10.14509/29470\n\n\n\n\nWypych, Alicja\nTwelker, Evan\nFreeman, L.K.\nLande, Lauren\nNewberry, R.J.\nReioux, D.A.\nSicard, K.R.\n2014\nMajor-oxide and trace-element geochemical data from rocks collected in 2014 in the Wrangellia mineral assessment area, Talkeetna Mountains C-4, C-3, and B-4 quadrangles, Alaska\n\nRaw Data File\nRDF 2014-22\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n4 p\nhttp://doi.org/10.14509/29140\n\n\n\n\nLande, Lauren\nNewberry, R.J.\nTwelker, Evan\n2015\nA petrological model for emplacement of the ultramafic Ni-Cu-PGE Alpha complex, eastern interior Alaska (poster): Geological Society of America Cordilleran Section - 111th Annual Meeting, Anchorage, Alaska, May 11-13, 2015\n\nPoster and Presentation\nLande, Lauren and others, 2015\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet\nhttp://doi.org/10.14509/29480\n\n\n\n\nTwelker, Evan\nWypych, Alicja\nSicard, K.R.\nNewberry, R.J.\nFreeman, L.K.\nReioux, D.A.\nLande, Lauren\n2014\nPreliminary results from 2014 geologic mapping in the Talkeetna Mountains, Alaska (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 3-9, 2014\n\nPoster and Presentation\nTwelker, Evan and others, 2014\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n28 p\nhttp://doi.org/10.14509/29160\n\n\n\n\nTwelker, Evan\nBachmann, E.N.\nFreeman, L.K.\nNewberry, R.J.\nReioux, D.A.\nSicard, K.R.\nTuzzolino, A.L.\nWright, T.C.\nWypych, Alicja\n2014\nMajor-oxide, minor-oxide, and trace-element geochemical data from rocks and stream sediments in the Wrangellia mineral assessment area, Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles, Alaska\n\nRaw Data File\nRDF 2014-3\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n6 p\nhttp://doi.org/10.14509/27181\n\n\n\n\nTwelker, Evan\nO'Sullivan, P.B.\n2016\nU-Pb zircon age data from meta-igneous rocks in the Clearwater Mountains, Mount Hayes A-6 Quadrangle, Alaska\n\nRaw Data File\nRDF 2016-8\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n17 p\nhttp://doi.org/10.14509/29663\n\n\n\n\nTodd, Erin\nKylander-Clark, Andrew\nWypych, Alicja\nTwelker, Evan\nSicard, K.R.\n2017\nU-Pb and Lu-Hf isotope, age, and trace-element data from zircons at four sites in the western Alaska Range and Talkeetna Mountains, Alaska\n\nRaw Data File\nRDF 2017-2\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n7 p\nhttp://doi.org/10.14509/29717\n\n\n\n\nWypych, Alicja\nTwelker, Evan\nAthey, J.E.\nLockett, A.C.\nNaibert, T.J.\nSicard, K.R.\nWerdon, M.B.\nWillingham, A.L.\n2017\nMajor-oxide and trace-element geochemical data from rocks collected in the Tanacross C-1, D-1, and D-2 quadrangles, Alaska in 2017\n\nRaw Data File\nRDF 2017-10\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n4 p\nhttp://doi.org/10.14509/29778\n\n\n\n\nTwelker, Evan\nWypych, Alicja\nSicard, K.R.\nNaibert, T.J.\nWerdon, M.B.\nAthey, J.E.\nWillingham, A.L.\nLockett, A.C.\n2017\nMajor-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska\n\nRaw Data File\nRDF 2017-11\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n4 p\nhttp://doi.org/10.14509/29779\n\n\n\n\n\nThis data set is being released into the DGGS Raw Data File series. The information has been examined by several geologists familiar with the study area, but the data and accompanying report have not been formally reviewed for technical content or for conformity to the editorial standards of DGGS. Questions regarding the accuracy of the analytical values can be best answered by the originating lab.\n\nnot applicable\nThis data release is complete.\n\n\nSample location coordinates (in WGS84 datum) were obtained using GPS-enabled field tablets, with a typical reported accuracy of about 10 meters.\n\n\n\n\nFieldwork - Fresh, unweathered samples from surficial outcrops were collected by DGGS field geologists; samples were selected based on their cross-cutting relationships with structural features.\n2012\n\n\nSample preparation and analysis - Before processing, samples were examined under a binocular microscope, or thin sections were prepared and scrutinized to eliminate the possibility of analyzing altered mineral phases. Rock samples 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. Additional sample preparation details may be found in the accompanying report.\n2012\n\n\nRevisions - a sample description sorting error in the summary table was corrected, February 15, 2019.\n2019\n\n\n\n\npoint\n\n\n\n\n0.000001\n0.000001\ndecimal degrees\n\n\nWorld Geodetic System of 1984\nWGS 84\n6378137\n298.257223563000025\n\n\n\n\n\n\nrdf2018-3-summary-data-locations.csv\nIdentification numbers, coordinates, sample descriptions, and summary ages of each sample\nAlaska Division of Geological & Geophysical Surveys\nsummary-data-locations\n\n\nSAMPLE\nThe label 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 the year the sample was collected, 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\nThe label 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\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\nPROJECT\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-146.927846\n-141.279938\ndecimal degrees\n\n\n\n\nLATITUDE\nLatitude, WGS84\nAlaska Division of Geological & Geophysical Surveys\n\n\n63.196506\n64.465954\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\nDESCRIPTION\nDescription of the sample\nAlaska Division of Geological & Geophysical Surveys\n\nA brief sample or station description.\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\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_PERCENT_39AR\nValue in percent of the 39 Ar used in that portion of the spectrum to determine the plateau age\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n38.4\n97.8\npercent\n\n\n\n\nPLATEAU_MSWD\nThe mean square weighted deviation of the plateau age calculation\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.33\n2.39\n\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_AGE_MA value was not calculated by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nW_A_AGE_MA\nWeighted average 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 average 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\nISOCHRON_AGE\nIsochron 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_MSWD\nThe mean square weighted deviation of the isochron age calculation\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\nNULL\nA NULL or blank values indicates that the value was not calculated 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 value was not calculated by the lab\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n\n\nAGE_TYPE_PREFERRED\nIndicates the age type of the 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\nrdf2018-3-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\n500\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\nIntegrated\nthe values in this row were calculated by weighting the individual heating steps by the fraction of 39Ar released\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\nCum39Ar\nCumulative ratio of 39Argon released at this step\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.0017\n1\n\n\n\n\nNULL\nA NULL or blank values indicates that the value was not applicable or not calculated by the lab\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\n0.2319\n41.46334\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\n0.01037\n9.54597\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\n-0.08208\n1.16705\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\n0.00038\n0.73712\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-0.05612\n0.13677\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\n0.00007\n0.03167\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-8205.58955\n97.42027\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\n0.25173\n387396.3875\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\n-0.15059\n2.14315\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\n0.0007\n1.35268\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\n-0.02209\n0.12175\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\n0.00004\n0.01331\n\n\n\n\nAr40Rad39ArK\nRatio of radiogenic 40Ar to 39Ar derived from potassium\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n1.06933\n24.71558\n\n\n\n\nEr40ArRad39ArK\nOne sigma error for each 40ArRad/39ArK value\nGeochronology Laboratory at the University of Alaska Fairbanks (UAF)\n\n\n0.02407\n13.21114\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\n9.75\n212.88\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\n0.34\n111.3\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\nMetadata Manager\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\n\n\nRDF 2018-3\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://doi.org/10.14509/30112\n\n\n\n\n\nFree download\n\n\n\n20181017\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nSimone Montayne\n\nMetadata Manager\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\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"}