{"action":"create","ckan_id":null,"date_created":"Sat, 28 Mar 2026 21:10:06 GMT","date_finished":null,"harvest_job_id":"c87df6d4-55a4-4157-8f97-1f84fe294e8c","harvest_source_id":"31f41541-38a0-400b-b240-10ebcb0acd9a","id":"80b16f52-d669-4ef2-a2ed-5ae3de4bf9c4","identifier":"https://dggs.alaska.gov/webpubs/metadata/RDF2013-8.xml","parent_identifier":null,"source_hash":"eeeee9a5b9be9d9a81171b8351e80e6bb67873512f8f5bf2ea21692c4be7a259","source_raw":"\n\n\n\n\nSolie, D.N.\nLayer, P.W.\nWerdon, M.B.\nNewberry, R.J.\nFreeman, L.K.\nLessard, R.R.\n2013\n40Ar/39Ar data, Alaska Highway corridor from Delta Junction to Canada border, parts of Mount Hayes, Tanacross, and Nabesna quadrangles, Alaska\nreport, digital-data\n\nRaw Data File\nRDF 2013-8\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n35 p.\nhttp://dx.doi.org/10.14509/26841\n\n\n\n40Ar/39Ar analyses of igneous rocks from the Alaska Highway corridor between Delta Junction and the Canada border show a range of Cretaceous ages from about 68 Ma to about 112 Ma. The 25 samples fall into two broad age groups. The younger group ranges from about 68 Ma to 73 Ma; the older group ranges from a minimum age of about 84 Ma to about 103 Ma. One sample, a mafic dike, yielded an older age of about 112 Ma.\nAlaska Division of Geological & Geophysical Surveys (DGGS) personnel collected rock samples while mapping the bedrock geology along the Alaska Highway corridor between Delta Junction and the Canada border. The purpose of this DGGS Raw Data File is to present the 40Ar/39Ar results of samples that were selected for age dating and make them available for use to the public. This data release is one component of a multi-year DGGS project studying the geology, geohazards and resources along the proposed gas pipeline corridor.\n\nThe dated materials vary by sample and, in many cases, multiple minerals or mineral separates were analyzed from each rock sample. The three tables presented in this release are organized according to the hierarchy of data. We provide the location and description of each rock; summary age determination for each dated rock, mineral grain, or mineral separate; and the analytical measurements generated by each heating step. The values in the fields: Sample_Id and Lab_Sample_Number are used within the tables and the report to cross reference rock sample and laboratory sample records. The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as \"layers,\" group and describe files that have intrinsic logical or topological relationships and correspond to subdirectories within the data distribution package. The metadata layer provides the metadata or other documentation files. Attribute information for each data layer is described in this metadata file under the \"Entity_and_Attribute_Information\" section. Data layer contents: \n>sample-location-details: Identification numbers, GPS coordinates, and description of each sample. \n>step-heating-data: The root 40Ar/39Ar analytical data table. This file lists the power output levels and resultant measurements from each sample run. \n>interpretive-details: Summary of 40Ar/39Ar radiometric ages of samples in this report and other interpretive details.\n\n\n\n\n\n2009\n2013\n\n\npublication date\n\n\ncomplete\nNone planned\n\n\n\n-144.728390\n-141.359559\n63.841939\n62.902474\n\n\n\n\nISO 19115 Topic Category\ngeoscientificInformation\n\n\nAlaska Division of Geological & Geophysical Surveys\n40Ar/39Ar\nAge Dates\nAnalyses and Sampling\nAnalytical Lab Results\nAnalytical Results\nAr-Ar\nBedrock\nBedrock Geology\nGeochronology\nGeology\nLab Methods\nSample Location\n\n\nAlaska Division of Geological & Geophysical Surveys\nAlaska Highway Corridor\nMount Hayes Quadrangle\nNabesna Quadrangle\nTanacross Quadrangle\n\n\nAlaska Division of Geological & Geophysical Surveys\nYukon-Tanana Terrane\nYukon-Tanana Upland\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\nCretaceous\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 Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\ndggsgis@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\n\n\nThis project was supported by Alaska State Capital Improvement Project funding. Partial funding for mapping and 40Ar/39Ar geochronology in the Mt. Hayes C-1, C-2, D-1, and D-2 quadrangles was also provided through the U.S. Geological Survey STATEMAP program under award number 07HQAG0076. Samples in this report were collected by Larry Freeman, Melanie Werdon, Richard Lessard, and Diana Solie of DGGS, and Rainer Newberry of University of Alaska Fairbanks Department of Geology & Geophysics.\n\n\nCarver, G.A.\nBemis, S.P.\nSolie, D.N.\nCastonguay, S.R.\nObermiller, K.E.\n2010\nActive and potentially active faults in or near the Alaska Highway corridor, Dot Lake to Tetlin Junction, Alaska\n\nPreliminary Interpretive Report\nPIR 2010-1\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n42 p\nhttp://dx.doi.org/10.14509/21121\n\n\n\n\nCarver, G.A.\nBemis, S.P.\nSolie, D.N.\nObermiller, K.E.\n2008\nActive and potentially active faults in or near the Alaska Highway corridor, Delta Junction to Dot Lake, Alaska\n\nPreliminary Interpretive Report\nPIR 2008-3D\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n32 p\nhttp://dx.doi.org/10.14509/17901\n\n\n\n\nHubbard, T.D.\nReger, R.D.\n2010\nEngineering - geologic map of the Alaska Highway corridor, Robertson River to Tetlin Junction, Alaska\n\nPreliminary Interpretive Report\nPIR 2009-6B\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n4 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/19742\n\n\n\n\nHubbard, T.D.\nReger, R.D.\nGallagher, P.E.\n2013\nEngineering - geologic map of the Alaska Highway corridor, Tetlin Junction to Canada border, Alaska\n\nPreliminary Interpretive Report\nPIR 2012-1B\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n2 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/24624\n\n\n\n\nKoehler, R.D.\nCarver, G.A.\n2012\nActive and potentially active faults along the Alaska Highway corridor, Tetlin Junction to the Canada border\n\nPreliminary Interpretive Report\nPIR 2012-2\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n23 p\nhttp://dx.doi.org/10.14509/23923\n\n\n\n\nKoehler, R.D.\nWoods, R.-E.F.\n2013\nPaleoseismic and LiDAR investigations along the Cathedral Rapids and Dot \"T\" Johnson faults, interior Alaska\n\nReport of Investigation\nRI 2013-4\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n21 p\nhttp://dx.doi.org/10.14509/26761\n\n\n\n\nReger, R.D.\nHubbard, T.D.\n2010\nReconnaissance interpretation of 1978-1983 permafrost, Alaska Highway corridor, Robertson River to Tetlin Junction, Alaska\n\nPreliminary Interpretive Report\nPIR 2009-6C\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n13 p., 4 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/19743\n\n\n\n\nReger, R.D.\nSolie, D.N.\n2008\nEngineering - geologic map, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska\n\nPreliminary Interpretive Report\nPIR 2008-3B\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n2 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/17981\n\n\n\n\nReger, R.D.\nSolie, D.N.\n2008\nReconnaissance interpretation of permafrost, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska\n\nPreliminary Interpretive Report\nPIR 2008-3C\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n10 p., 2 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/17621\n\n\n\n\nReger, R.D.\nHubbard, T.D.\nCarver, G.A.\n2011\nSurficial geology of Alaska Highway corridor, Robertson River to Tetlin Junction, Alaska\n\nPreliminary Interpretive Report\nPIR 2009-6A\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n53 p., 4 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/19741\n\n\n\n\nReger, R.D.\nHubbard, T.D.\nGallagher, P.E.\n2012\nReconnaissance interpretation of 1978-1981 permafrost, Alaska Highway corridor, Tetlin Junction to Canada border, Alaska\n\nPreliminary Interpretive Report\nPIR 2012-1C\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n27 p., 2 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/23444\n\n\n\n\nReger, R.D.\nHubbard, T.D.\nGallagher, P.E.\n2012\nSurficial geology of the Alaska Highway corridor, Tetlin Junction to Canada border, Alaska\n\nPreliminary Interpretive Report\nPIR 2012-1A\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n25 p., 2 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/23443\n\n\n\n\nReger, R.D.\nStevens, D.S.P.\nSolie, D.N.\n2008\nSurficial-geologic map, Delta Junction to Dot Lake, Alaska Highway corridor\n\nPreliminary Interpretive Report\nPIR 2008-3A\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n48 p., 2 sheets, scale 1:63,360\nhttp://dx.doi.org/10.14509/17961\n\n\n\n\nSolie, D.N.\nWerdon, M.B.\nNewberry, R.J.\nFreeman, L.K.\nLessard, R.R.\n2008\nMajor-oxide, minor-oxide, trace-element and geochemical data from rocks collected in the Alaska Highway corridor Mount Hayes Quadrangle, Alaska in 2006 and 2007\n\nRaw Data File\nRDF 2008-2 v. 1.0.1\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n23 p\nhttp://dx.doi.org/10.14509/16021\n\n\n\n\n\nCoordinates of sample locations were determined by the geologists in the field using handheld GPS units. Sample numbers were recorded in the field on sample bags and on field note sheets. The sample numbers were transcribed into an Access database by a field assistant. The sample location table was generated from the database and was cross checked for consistency against the sample numbers recorded on the bags. Laboratory sample numbers were generated by the UAF geochronology lab from the a list provided by DGGS. See text report for additional discussion of laboratory procedures. Lab results and interpretations were examined by the DGGS geologists to ensure that they are reasonable given the geologic context of the sample.\n\nNo topologic relationships are present in the data. We plotted the data points using GIS software to ensure that they are correctly located and we visually reviewed the sample identification numbers and other attribute values to ensure that they are free of typological errors.\nThese analyses were completed throughout the duration of the project and subsequently compiled into a single report. Users should note that the interpretive summaries that are provided in the text report have been lightly edited for clarity but are generally provided as received. In a few cases the lab did not specifically record the type of dated material (mineral separate versus single grain). Based on subsequent personal correspondence with lab staff, we indicate that the dated material type is \"mineral separate\" for all samples that were not explicitly described as single grain or whole rock within the text report.\n\n\nCoordinates of sample locations were determined by the geologists in the field using handheld GPS units. Estimated position errors calculated by GPS units averaged approximately 6 meters.\n\n\n\n\n\n\nLanphere, M.A.\nDalrymple, G.B.\n2000\nFirst-principles calibration of 38Ar tracers :implications for the ages of 40Ar/39Ar fluence monitors\n\nProfessional Paper\nP 1621\n\n\nUnited States\nU.S. Geological Survey\n\n10 p\nhttp://www.dggs.alaska.gov/pubs/id/16622\n\n\npaper\n\n\n\n2000\n\n\npublication date\n\nLanphere, M.A. and Dalrymple, G.B., 2000\nsample preparation\n\n\n\n\nSamson, S.D.\nAlexander, E.C.\n1987\nCalibration of the inter-laboratory 40Ar/39Ar dating standard, MMhb-1\n\nIsotope Geoscience Section\nv. 66\n\n\nNetherlands\nEuropean Association of Geochemistry\n\n\n\npaper\n\n\n\n1987\n\n\npublication date\n\nSamson, S.D. and Alexander, E.C., 1987\nsample preparation\n\n\n\n\nYork, Derek\nHall, C.M\nYanase, Yotaro\nHanes, J.A\n1981\n40Ar/39Ar dating of terrestrial minerals with a continuous laser\n\nGeophysical Research Letters\nv. 8, n. 11\n\n\nUnited States\nAmerican Geophysical Union\n\n\n\npaper\n\n\n\n1981\n\n\npublication date\n\nYork, Derek and others, 1981\nsample analysis\n\n\n\n\nLayer, P.W\nHall, C.M\nYork, Derek\n1987\nThe derivation of 40Ar/39Ar age spectra of single grains of hornblende and biotite by laser step-heating\n\nGeophysical Research Letters\nv. 14, n. 7\n\n\nUnited States\nAmerican Geophysical Union\n\n\n\npaper\n\n\n\n1987\n\n\npublication date\n\nLayer, P.W and others, 1987\nsample analysis\n\n\n\n\nLayer, P.W\n2000\nArgon-40/Argon-39 age of the El'gygytgyn impact event, Chukotka, Russia\n\nMeteroritics and Planetary Science\nv. 35, n. 3\n\n\nUnited States\nMeteoritical Society\n\n\n\npaper\n\n\n\n2000\n\n\npublication date\n\nLayer, P.W, 2000\nsample analysis\n\n\n\n\nMcDougall, Ian\nHarrison, T.M\n1999\nGeochronology and thermochronology by the 40Ar/39Ar method, 2nd ed.\n\nUnited States\nOxford University Press\n\n\n\npaper\n\n\n\n1999\n\n\npublication date\n\nMcDougall, Ian and Harrison, T.M, 1999\nsample analysis\n\n\nFieldwork - Field geologists collected rock samples from the surface or within 0.5 m of the surface. Care was taken to collect fresh, unweathered samples representative of igneous rock types in the map area. Locations were recorded using handheld GPS units with an estimated horizontal accuracy of approximately 10 m. Samples were collected during the 2006 through 2009 field seasons.\n2009\n\n\nSample preparation - The selected rock samples were submitted to the University of Alaska Fairbanks Geochronology Laboratory. There the samples were crushed, washed, and sieved to either 100-250 or 250-500 micron size fractions, and hand-picked for date-able mineral phases. The monitor mineral MMhb-1 (Samson, S.D. and Alexander, E.C., 1987) with an age of 513.9 Ma (Lanphere, M.A. and Dalrymple, G.B., 2000) was used to monitor neutron flux (and calculate the irradiation parameter, J). The samples and standards were wrapped in aluminum foil and loaded into aluminum cans of 2.5 cm diameter and 6 cm height. The samples were irradiated in position 5c of the uranium-enriched research reactor of McMaster University in Hamilton, Ontario, Canada, for 20 megawatt-hours.\nLanphere, M.A. and Dalrymple, G.B., 2000\nSamson, S.D. and Alexander, E.C., 1987\n2010\n\n\nSample analysis - Upon their return from the reactor, the samples and monitors were loaded into 2-mm-diameter holes in a copper tray that was then loaded in an ultra-high-vacuum extraction line. The monitors were fused, and samples heated, using a 6-watt argon-ion laser following the technique described in York and others (1981), Layer and others (1987), and Layer (2000). Argon purification was achieved using a liquid nitrogen cold trap and a SAES Zr-Al getter at 400 degrees C. The samples were analyzed in a VG-3600 mass spectrometer at the Geophysical Institute, University of Alaska Fairbanks. The argon isotopes measured were corrected for system blank and mass discrimination, as well as calcium, potassium, and chlorine interference reactions following procedures outlined in McDougall and Harrison (1999). See text report for additional description of the analytical procedures, parameters, and a comprehensive bibliography.\nYork, Derek and others, 1981\nLayer, P.W and others, 1987\nLayer, P.W, 2000\nMcDougall, Ian and Harrison, T.M, 1999\n2010\n\n\n\n\npoint\n\n\n\n\nNorth American Datum of 1927\nNorth American Datum of 1927\n6378206.4\n294.9786982\n\n\n\n\n\n\nrdf2013-8-sample-location-details.csv\nIdentification numbers, GPS coordinates, and description of each sample.\nAlaska Division of Geological & Geophysical Surveys\nsample-location-details\n\n\nSample_Id\nLabel assigned to identify the field location where a sample was collected and to identify the sample in related project publications.\nAlaska Division of Geological & Geophysical Surveys\n\nGeneric example of a station identifier: 20YYAAA9999X: 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. The initials used by the geologists who collected samples for this project are: RL = Lessard, R.R.; MBW = Werdon, M.B.; DNS = Solie, D.N.; RN = Newberry, R.J.; LF = Freeman, L.K.\n\n\n\nLatitude\nLatitude, NAD27\nAlaska Division of Geological & Geophysical Surveys\n\n\n62.902474\n63.841939\n\n\n\n\nLongitude\nLongitude, NAD27\nAlaska Division of Geological & Geophysical Surveys\n\n\n-144.72839\n-141.359559\n\n\n\n\nDescription\nDescription of the sample\nAlaska Division of Geological & Geophysical Surveys\n\nA brief sample description; note that the values in this field may exceed 255 characters\n\n\n\n\n\nrdf2013-8-step-heating-data.csv\nThe root 40Ar/39Ar analytical data table. This file lists the power output levels and resultant measurements from each sample run.\nAlaska Division of Geological & Geophysical Surveys\nstep-heating-data\n\n\nSample_Id\nLabel assigned to identify the field location where a sample was collected and to identify the sample in related project publications.\nAlaska Division of Geological & Geophysical Surveys\n\nGeneric example of a station identifier: 20YYAAA9999X: 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. The initials used by the geologists who collected samples for this project are: RL = Lessard, R.R.; MBW = Werdon, M.B.; DNS = Solie, D.N.; RN = Newberry, R.J.; LF = Freeman, L.K.\n\n\n\nLab_Sample_Number\nSample identifier assigned by the laboratory, note that these numbers correspond to spectra plot labels provided in the appendix of the text report\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\nLab numbers generally combine the DGGS sample number and the name of the dated mineral, but they do not follow a specific naming convention.\n\n\n\nLaser_mW\nLaser output level in megawatts\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\nIntegrated\n\"Integrated\" values in the Laser_mW column indicate that this row provides the age and errors given by the total gas measured and the values are equivalent to a potassium-argon (K-Ar) age.\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n\n\n300\n9000\nmegawatts\n\n\n\n\nCum39Ar\nCumulative ratio of 39Argon released at this step\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\nNULL\nBlank (NULL) field values indicate that a value was not provided by the lab.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\n0.0025\n1\n\n\n\n\nMe40Ar39Ar\nMeasured 40Ar/39Ar ratio for each heating step, corrected for blank and 39Ar decay\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n7.7367\n427.3728\n\n\n\n\nEr40Ar39Ar\nThe one sigma error for each 40Ar/39Ar measurement\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n0.026\n9.8057\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\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n-0.0009\n119.75993\n\n\n\n\nEr37Ar39Ar\nThe one sigma error for each 37Ar/39Ar measurement\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n0.0001\n2.98741\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\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n-0.0764\n1.32089\n\n\n\n\nEr36Ar39Ar\nThe one sigma error for each 36Ar/39Ar measurement\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n0\n0.06435\n\n\n\n\nAtm40Ar\nPercent of 40Ar which is atmospheric in composition at each step level\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n-199.3\n111.3\npercent\n\n\n\n\nMeCaK\nRatio of Calcium to Potassium as determined from 37Ar/39Ar\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n-0.0016\n240.0451\n\n\n\n\nErCaK\nThe one sigma error for each Ca/K determination\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n0.0002\n6.5411\n\n\n\n\nMeClK\nRatio of Chlorine to Potassium as determined from 38Ar/39Ar\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n-0.00116\n0.2019\n\n\n\n\nErClK\nThe one sigma error for each Cl/K determination\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n0\n0.01822\n\n\n\n\n40ArRad39ArK\nRatio of radiogenic 40Ar to 39Ar derived from potassium\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n-5.325\n37.1353\n\n\n\n\nEr40ArRad39ArK\nOne sigma error for each 40ArRad/39ArK value\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n0.03\n19.2562\n\n\n\n\nAgeMa\nCalculated age for each temperature step for each sample\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n-36.2\n234.2\nMa\n\n\n\n\nErAgeMa\nOne sigma error of the age determination of each heating step\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n0.2\n128.9\nMa\n\n\n\n\nWeightedAverageOfJFromStandards\nJ value, calculated from the weighted average of standards placed in various positions in the nuclear reactor\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n2.666e-03 \u00c3\u0082\u00c2\u00b1 1.336e-05\n0.002666 \u00c3\u0082\u00c2\u00b1 0.00001336\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n\n\n3.733e-03 \u00c3\u0082\u00c2\u00b1 1.265e-05\n0.003733 \u00c3\u0082\u00c2\u00b1 0.00001265\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n\n\n3.578e-03 \u00c3\u0082\u00c2\u00b1 1.111e-05\n0.003578 \u00c3\u0082\u00c2\u00b1 0.00001111\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n\n\n3.411e-03 \u00c3\u0082\u00c2\u00b1 1.051e-05\n0.003411 \u00c3\u0082\u00c2\u00b10.00001051\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n\n\n3.463e-03 \u00c3\u0082\u00c2\u00b1 1.087e-05\n0.003463 \u00c3\u0082\u00c2\u00b1 0.00001087\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\n\n\n\n\nrdf2013-8-interpretive-details.csv\nSummary of 40Ar/39Ar radiometric ages of samples in this report and other interpretive details.\nAlaska Division of Geological & Geophysical Surveys\ninterpretive-details\n\n\nSample_Id\nLabel assigned to identify the field location where a sample was collected and to identify the sample in related project publications.\nAlaska Division of Geological & Geophysical Surveys\n\nGeneric example of a station identifier: 20YYAAA9999X: 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. The initials used by the geologists who collected samples for this project are: RL = Lessard, R.R.; MBW = Werdon, M.B.; DNS = Solie, D.N.; RN = Newberry, R.J.; LF = Freeman, L.K.\n\n\n\nDated_Material\nIndicates the type of material that was used for analysis\nUniversity of Alaska Fairbanks Geochronology Laboratory\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\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\nThe minerals selected for dating were: biotite, hornblende, or muscovite.\n\n\n\nLab_Sample_Number\nSample identifier assigned by the laboratory, note that these numbers correspond to spectra plot labels provided in the appendix of the text report\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\nLab numbers generally combine the DGGS sample number and the name of the dated mineral, but they do not follow a specific naming convention.\n\n\n\nIntegrated_Age_Ma\nIntegrated age and age error in million years\nUniversity of Alaska Fairbanks Geochronology Laboratory\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\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\nThe values are a concatenation of the plateau age determination and the calculated error associated with the plateau age determination\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\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\nNULL\nBlank (NULL) field values indicate that a value was not provided by the lab.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\n17.8\n99\npercent\n\n\n\n\nPlateau_MSWD\nThe mean square weighted deviation of the plateau age calculation\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\nNULL\nBlank (NULL) field values indicate that a value was not provided by the lab.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\n0.03\n26\n\n\n\n\nPlateau_Remarks\nComments and additional values that pertain to the plateau age determination method or interpretation.\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\nFree text\n\n\n\nIsochron_Age\nIsochon age and age error in million years\nUniversity of Alaska Fairbanks Geochronology Laboratory\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\nBlank (NULL) field values indicate that a value was not provided by the lab.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\nIsochron_MSWD\nThe mean square weighted deviation of the isochron age calculation\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\n\nNULL\nBlank (NULL) field values indicate that a value was not provided by the lab.\nAlaska Division of Geological & Geophysical Surveys\n\n\n\n\n0.17\n2.6\n\n\n\n\nIsochron_Remarks\nComments and additional values that pertain to the isochron age determination method or interpretation.\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\nFree text\n\n\n\nLab_Notes\nAdditional information provided by the lab\nUniversity of Alaska Fairbanks Geochronology Laboratory\n\nFree text\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\nRDF 2013-8\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/10.14509/26841\n\n\n\n\n\nFree download\n\n\n\n20140107\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"}