Identification_Information: Citation: Citation_Information: Originator: Benowitz, J.A. Originator: Sicard, K.R. Originator: Naibert, T.J. Originator: Layer, P.W. Publication_Date: 2017 Title: 40Ar/39Ar data from the Tok River area, Tanacross A-5 and A-6 quadrangles and adjoining areas, eastern Alaska Range Geospatial_Data_Presentation_Form: report digital data Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 26 p. Online_Linkage: http://doi.org/10.14509/29727 Description: Abstract: This report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the Alaska Division of Geological & Geophysical Surveys' (DGGS) geologic mapping project in the Tanacross A-5 and A-6 quadrangles and adjoining areas. Our results indicate the Hona granodiorite pluton intruded the area in the Late Cretaceous between 76 and 71 Ma. We determined Cretaceous metamorphic ages from 126 to 121 Ma for hornblende, biotite, sericite and muscovite from multiple samples of upper greenschist to amphibolite grade rocks. This is consistent with regional argon results that imply this area is in the upper plate of the Yukon Tanana Terrane (Hansen and Dusel-Bacon, 1998). Basaltic andesite dikes returned Late Cretaceous (99.0 +/- 0.5 Ma) and Tertiary (58.4 +/- 0.3 Ma) ages from biotite; these constrain late brittle faulting in the area. Finally, we obtained a Late Cretaceous age (71.5 +/- 0.5) for a basaltic andesite flow; these ages constrain the timing of displacement on some of the faults in the map area. Analyses were performed by the University of Alaska Fairbanks (UAF) Geochronology Laboratory, and results were reported by Jeff Benowitz and Paul Layer. Products included in this data release are a summary of sample collection methods, the laboratory report, analytical data tables and associated metadata, and plots of the 40Ar/39Ar age spectra and Ca/K and Cl/K ratios. Purpose: This project is part of a multi-year effort focusing on improving the publicly-available geological and geochemical data and assessing the mineral potential of the Tanacross quadrangle. The project focused on detailed mapping, identification, sampling and characterization of Devonian-Mississippian metamorphic rocks, Triassic and Cretaceous intrusions, and surficial geology, as well as modern geochemical characterizations of skarn, vein, and volcanogenic massive sulfide (VMS) hosted mineralization. The DGGS Mineral Resources section spent 321 person-days in the field in 2015 and 2016 to conduct approximately 540 square miles of 1:63,360-scale geologic mapping and sampling in the Tok River area, of central Alaska. The new geologic map will greatly improve the understanding of the geology, structural history, and mineral potential of the area (Sicard and others, in press). This area includes exposures of Devonian-Mississippian metamorphic rocks, metamorphosed Triassic gabbroic intrusions, and Cretaceous granodiorite intrusions and basaltic andesite lava flows. The area lies between the Delta mineral belt to the west, which has been the focus of exploration into VMS, and skarn deposits of the Tetlin project to the east. The area also contains numerous inactive and possibly active faults and multiple stages of deformation and magmatism, which are critical for understanding the geologic history of the eastern Alaska Range. Reconnaissance scale geologic mapping of the Tanacross quadrangle was completed by Foster (1970) at a scale of 1:250,000. Supplemental_Information: >summary-data-locations: Identification numbers, coordinates, sample descriptions, and summary ages of each sample >step-heating-data: Power output levels and resultant measurements from each sample run Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2016 Ending_Date: 2017 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -144.300013 East_Bounding_Coordinate: -143.212748 North_Bounding_Coordinate: 63.249459 South_Bounding_Coordinate: 63.028463 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: 40Ar/39Ar Theme_Keyword: Amphibolite Theme_Keyword: Analyses Theme_Keyword: Analyses and Sampling Theme_Keyword: Analytical Lab Results Theme_Keyword: Analytical Results Theme_Keyword: Basalt Theme_Keyword: Bedrock Theme_Keyword: Crystals Theme_Keyword: Exploration Theme_Keyword: Faulting Theme_Keyword: Geochronology Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Gneiss Theme_Keyword: Granite Theme_Keyword: Granodiorite Theme_Keyword: Greenschist Theme_Keyword: Hornblende Theme_Keyword: Igneous Theme_Keyword: Isotopes Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Rocks Theme_Keyword: Metamorphism Theme_Keyword: Methods Theme_Keyword: Mica Theme_Keyword: Mineral Composition Theme_Keyword: Mineralogy Theme_Keyword: Mineral Prospect Theme_Keyword: Minerals Theme_Keyword: Muscovite Theme_Keyword: Plagioclase Theme_Keyword: Plutonic Theme_Keyword: Rocks Theme_Keyword: Sample Location Theme_Keyword: Sericite Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Noah Prospect Place_Keyword: Shalosky Prospect Place_Keyword: Tanacross Quadrangle Place_Keyword: Tok Place_Keyword: Tok Mining District Place_Keyword: Tok River Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Hona Pluton Stratum_Keyword: Yukon-Tanana Terrane Temporal: Temporal_Keyword_Thesaurus: Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America Temporal_Keyword: Cretaceous Temporal_Keyword: Tertiary Access_Constraints: This 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). Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5039 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Data_Set_Credit: This project was jointly funded by the State of Alaska's Strategic and Critical Minerals Assessment project (part of DGGS's Airborne Geophysical/Geological Mineral Inventory program [AGGMI]), a USGS Mineral Resources Assessment Grant G16AS00003, and the USGS National Cooperative Geologic Mapping Program, STATEMAP component, under 2016 award number G16AC00182. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. We acknowledge Heidi Lingenfelter and Joe Bovee representing Ahtna, Inc., James Mery of Doyon Limited, and Mentasta Village, for providing access to private lands in the map area. U.S. Bureau of Land Management (BLM) Glennallen Field Office and Tom Beaucage of (BLM) Eastern Field Office (Fairbanks) assisted us with permitting on BLM-managed lands. Field mapping and sample collection were conducted by Lawrence Freeman, Robert Gillis, Lauren Lande, Travis Naibert, Rainer Newberry, David Reioux, Karri Sicard, Evan Twelker, Melanie Werdon, Amanda Willingham, and Alicja Wypych. Much appreciated field mapping, regional geologic context, and sample collection assistance came from Jeffrey Benowitz, Samuel Dashevsky, and Peter Illig. Cross_Reference: Citation_Information: Originator: Naibert, T.J. Originator: Werdon, M.B. Originator: Lande, Lauren Originator: Wypych, Alicja Publication_Date: 2016 Title: Trace-element geochemical data from stream sediments collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2016-10 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/29688 Cross_Reference: Citation_Information: Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Gillis, R.J. Originator: Lande, L.L. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Twelker, Evan Originator: Werdon, M.B. Originator: Willingham, A.L. Publication_Date: 2016 Title: Major-oxide and trace-element geochemical data from rocks collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2016-9 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/29685 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Freeman, L.K. Originator: Sicard, K.R. Originator: Busk, A.C. Publication_Date: 2016 Title: Preliminary report on mineral occurrences in the Tok River area, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2016-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 7 p Online_Linkage: http://doi.org/10.14509/29605 Cross_Reference: Citation_Information: Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Twelker, Evan Originator: Freeman, L.K. Originator: Lande, Lauren Originator: Reioux, D.A. Publication_Date: 2015 Title: Major-oxide and trace-element geochemical data from rocks collected in 2015 in the Tok area, Tanacross A-5, A-6, and parts of adjacent quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2015-15 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/29517 Cross_Reference: Citation_Information: Originator: Emond, A.M. Originator: CGG Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: CGG Land (US) Inc. Publication_Date: 2015 Title: Tok electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://doi.org/10.14509/29347 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This data set is being released in 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. Logical_Consistency_Report: not applicable Completeness_Report: This data release is complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Sample-location coordinates were collected using handheld Trimble Juno T5 GPS units, with typical reported accuracy of about 10 meters. Lineage: Process_Step: Process_Description: Fieldwork - 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. Process_Date: 2016 Process_Step: Process_Description: Sample 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. Process_Date: 2016 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 Geographic_Coordinate_Units: decimal degrees Geodetic_Model: Horizontal_Datum_Name: World Geodetic System of 1984 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257223563000025 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: rdf2017-5-summary-data-locations.csv Entity_Type_Definition: Identification numbers, coordinates, sample descriptions, and summary ages of each sample Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: summary-data-locations Attribute: Attribute_Label: SAMPLE Attribute_Definition: Label assigned in the field to identify the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Generic 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. Attribute: Attribute_Label: LAB_SAMPLE_NUMBER Attribute_Definition: Label used by the lab to identify the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The 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. Attribute: Attribute_Label: COLLECTOR Attribute_Definition: The geologist who collected the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: The samples presented in this report were collected by the authors or other DGGS staff. Attribute: Attribute_Label: LONGITUDE Attribute_Definition: Longitude, WGS84 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -144.300013 Range_Domain_Maximum: -143.212748 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LATITUDE Attribute_Definition: Latitude, WGS84 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 63.028463 Range_Domain_Maximum: 63.249459 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: DATED_MATERIAL Attribute_Definition: Indicates the type of material that was used for analysis Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The 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. Attribute: Attribute_Label: MINERAL Attribute_Definition: Indicates the mineral that was used for analysis Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The minerals selected for dating would typically be grains of biotite, hornblende, or muscovite. Attribute: Attribute_Label: DESCRIP_1 Attribute_Definition: Description of the sample Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Characters 1 to 254 of a brief sample or station description. Attribute: Attribute_Label: DESCRIP_2 Attribute_Definition: Extension of the sample or station description for descriptions that are greater than 254 characters in length Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Characters greater than 254 of the sample or station description. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: Blank (NULL) values indicate that the descriptive text is shorter than 254 characters. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: DESCRIP_3 Attribute_Definition: Extension of the sample or station description for descriptions that are greater than 509 characters in length Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Characters greater than 509 of the sample or station description. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: Blank (NULL) values indicate that the descriptive text is shorter than 509 characters. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: MAP_UNIT Attribute_Definition: The interpreted map unit of the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Map unit designations are based on geologic mapping and petrographic observations. Attribute: Attribute_Label: MAP_UNIT_REFERENCE Attribute_Definition: Bibliographic reference to the map unit nomenclature. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Map unit designations are based on concurrent geologic mapping or previously published reports. A comprehensive reference list is provided in the accompanying report. Attribute: Attribute_Label: INTEGRATED_AGE_MA Attribute_Definition: Integrated age and age error in million years Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The values are a concatenation of the integrated age determination and the calculated error associated with the integrated age determination Attribute: Attribute_Label: PLATEAU_AGE_MA Attribute_Definition: Plateau age and age error in million years Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The values are a concatenation of the plateau age determination and the calculated error associated with the plateau age determination Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the PLATEAU_AGE_MA value was not calculated by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: PLATEAU_PERCENT_39AR Attribute_Definition: Value in percent of the 39 Ar used in that portion of the spectrum to determine the plateau age Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 34.2 Range_Domain_Maximum: 97.1 Attribute_Units_of_Measure: percent Attribute: Attribute_Label: PLATEAU_MSWD Attribute_Definition: The mean square weighted deviation of the plateau age calculation Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.03 Range_Domain_Maximum: 4.31 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the value was not calculated by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: PLATEAU_REMARKS Attribute_Definition: Comments and additional values that pertain to the plateau age determination method or interpretation. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: Free text Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the PLATEAU_REMARKS value was not provided by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: W_A_AGE_MA Attribute_Definition: Weighted average age and age error in million years Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The values are a concatenation of the weighted average age determination and the calculated error associated with the weighted mean average age determination Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the W_M_AGE_MA value was not calculated by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: ISOCHRON_AGE Attribute_Definition: Isochon age and age error in million years Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The values are a concatenation of the isochron age determination and the calculated error associated with the isochron age determination Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the ISOCHRON_AGE value was not provided by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: ISOCHRON_MSWD Attribute_Definition: The mean square weighted deviation of the isochron age calculation Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.06 Range_Domain_Maximum: 2.21 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the value was not calculated by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: ISOCHRON_REMARKS Attribute_Definition: Comments and additional values that pertain to the isochron age determination method or interpretation Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: Free text Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the ISOCHRON_REMARKS value was not provided by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: AGE_TYPE_PREFERRED Attribute_Definition: Indicates the age type of the preferred age. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: A 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. Attribute: Attribute_Label: PREFERRED_AGE Attribute_Definition: The values are a concatenation of the preferred age determination and the calculated error associated with the preferred age determination Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The preferred age for each analysis is discussed in detail in the accompanying lab report. Detailed_Description: Entity_Type: Entity_Type_Label: rdf2017-5-step-heating-data.csv Entity_Type_Definition: Power output levels and resultant measurements from each sample run Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: step-heating-data Attribute: Attribute_Label: SAMPLE Attribute_Definition: Label assigned in the field to identify the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: Generic 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. Attribute: Attribute_Label: LAB_SAMPLE_NUMBER Attribute_Definition: Label used by the lab to identify the sample. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys and Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: The 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. Attribute: Attribute_Label: Laser_mW Attribute_Definition: Laser output level in megawatts Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 500 Range_Domain_Maximum: 9000 Attribute_Units_of_Measure: megawatts Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A 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. Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: Integrated Attribute_Definition: We 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. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: The values in the row were derived from a heating step Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Integrated Enumerated_Domain_Value_Definition: the values in this row were calculated by weighting the individual heating steps by the fraction of 39Ar released Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: Cum39Ar Attribute_Definition: Cumulative ratio of 39Argon released at this step Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0055 Range_Domain_Maximum: 1 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the value was not applicable or not calculated by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute: Attribute_Label: Me40Ar39Ar Attribute_Definition: Measured 40Ar/39Ar ratio for each heating step, corrected for blank and 39Ar decay Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 6.60581 Range_Domain_Maximum: 10364.21106 Attribute: Attribute_Label: Er40Ar39Ar Attribute_Definition: The one sigma error for each 40Ar/39Ar measurement Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.01069 Range_Domain_Maximum: 223.03624 Attribute: Attribute_Label: Me37Ar39Ar Attribute_Definition: The ratio of measured 37Ar to measured 39Ar for each heating interval for each sample corrected for blank and 37Ar and 39Ar decay Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.00593 Range_Domain_Maximum: 99.5972 Attribute: Attribute_Label: Er37Ar39Ar Attribute_Definition: The one sigma error for each 37Ar/39Ar measurement Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00009 Range_Domain_Maximum: 2.34749 Attribute: Attribute_Label: Me36Ar39Ar Attribute_Definition: Ratio of measured 36Ar to measured 39Ar for each step interval for each sample corrected for blank and 39Ar decay Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.01882 Range_Domain_Maximum: 4.23724 Attribute: Attribute_Label: Er36Ar39Ar Attribute_Definition: The one sigma error for each 36Ar/39Ar measurement Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00004 Range_Domain_Maximum: 0.10218 Attribute: Attribute_Label: Atm40Ar Attribute_Definition: Percent of 40Ar which is atmospheric in composition at each step level Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -65.55984 Range_Domain_Maximum: 89.83902 Attribute: Attribute_Label: ErAtm40Ar Attribute_Definition: The one sigma error for the percent of 40Ar which is atmospheric in composition at each step level Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.05976 Range_Domain_Maximum: 37.29236 Attribute: Attribute_Label: MeCaK Attribute_Definition: Ratio of Calcium to Potassium as determined from 37Ar/39Ar Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.01088 Range_Domain_Maximum: 196.57356 Attribute: Attribute_Label: ErCaK Attribute_Definition: The one sigma error for each Ca/K determination Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00017 Range_Domain_Maximum: 4.98376 Attribute: Attribute_Label: MeClK Attribute_Definition: Ratio of Chlorine to Potassium as determined from 38Ar/39Ar Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0001 Range_Domain_Maximum: 0.32927 Attribute: Attribute_Label: ErClK Attribute_Definition: The one sigma error for each Cl/K determination Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00001 Range_Domain_Maximum: 0.0104 Attribute: Attribute_Label: Ar40Rad39ArK Attribute_Definition: Ratio of radiogenic 40Ar to 39Ar derived from potassium Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 5.09025 Range_Domain_Maximum: 9139.58989 Attribute: Attribute_Label: Er40ArRad39ArK Attribute_Definition: One sigma error for each 40ArRad/39ArK value Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.02092 Range_Domain_Maximum: 197.8612 Attribute: Attribute_Label: AgeMa Attribute_Definition: Calculated age for each temperature step for each sample Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 44.11 Range_Domain_Maximum: 6655.3 Attribute_Units_of_Measure: MA Attribute: Attribute_Label: ErAgeMa Attribute_Definition: One sigma error of the age determination of each heating step Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.19 Range_Domain_Maximum: 45.85 Attribute_Units_of_Measure: MA Attribute: Attribute_Label: WeightedAverageOfJFromStandards Attribute_Definition: J value, calculated from the weighted average of standards placed in various positions in the nuclear reactor Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Unrepresentable_Domain: WeightedAverageOfJFromStandards value and error 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