Identification_Information: Citation: Citation_Information: Originator: Benowitz, J.A. Originator: Layer, P.W. Originator: Wypych, Alicja Originator: Twelker, Evan Publication_Date: 2015 Title: 40Ar/39Ar data from the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska Geospatial_Data_Presentation_Form: report and digital data Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2015-10 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 19 p. Online_Linkage: http://dx.doi.org/10.14509/29454 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) Talkeetna Mountains C-4 Quadrangle and Adjoining Areas geologic mapping project. Hornblende-bearing gabbro returned a Late Triassic crystallization age consistent with regional results for Nikolai Greenstone-related magmatism. We determined Early Jurassic metamorphic ages for hornblende and sericite from two samples of upper greenschist to amphibolite grade metavolcanic rocks. Our results indicate that a granodiorite pluton intruding Wrangellia in the study area has a Middle Jurassic age consistent with the Talkeetna Arc, indicating that the Wrangellia and Peninsular terranes were joined at that time. Cretaceous plutons and porphyry intrusions in the map area can be divided into two types: reduced granitic to felsic porphyry intrusions with latest Cretaceous ages, and an earlier, oxidized type with early Late Cretaceous ages. This observation corresponds to similar patterns in magmatism in the western Alaska Range, and may indicate geological potential for similar style intrusive-related gold, copper, and molybdenum mineralization in the study area. Finally, we obtained Eocene ages for andesite and rhyolite; 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 the 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 the plots of the 40Ar/39Ar age spectra, Ca/K, and Cl/K ratios. Purpose: The U.S. Geological Survey (USGS) National Cooperative Geologic Mapping Program partially funded work by DGGS to map approximately 450 mi2 of the Talkeetna Mountains region of central Alaska at 1:50,000 scale. This area contains significant exposures of Late Triassic mafic volcanics and gabbro sills that have been the focus of region-wide exploration for the Strategic and Critical platinum-group elements (PGEs). The area also exposes numerous inactive and possibly active faults that project through the area of the proposed Susitna-Watana hydroelectric dam and reservoir. Because this area was poorly mapped at a reconnaissance scale of 1:250,000, a team of eight DGGS geologists spent 42 days in the field to produce a new geologic map and a greatly improved understanding of the geology, structural history, and mineral potential of the area. Supplemental_Information: >border: Outline of the study area >arar-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: 2015 Ending_Date: 22014 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -148.944298 East_Bounding_Coordinate: -148.435438 North_Bounding_Coordinate: 62.735032 South_Bounding_Coordinate: 62.401607 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: Age Dates Theme_Keyword: Analyses Theme_Keyword: Analyses and Sampling Theme_Keyword: Analytical Lab Results Theme_Keyword: Analytical Results Theme_Keyword: Ar-Ar Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: Geochronology Theme_Keyword: Geology Theme_Keyword: Lab Methods Theme_Keyword: Plutonic Rocks Theme_Keyword: Plutons Theme_Keyword: STATEMAP Project Theme_Keyword: Sample Location Theme_Keyword: Strategic and Critical Minerals Assessment Project Theme_Keyword: Volcanic Theme_Keyword: Volcanic Arc Theme_Keyword: Volcanic Rocks Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Talkeetna Mountains Quadrangle Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Nikolai Greenstone Stratum_Keyword: Talkeetna Arc Stratum_Keyword: Wrangellia 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: Early Jurassic Temporal_Keyword: Eocene Temporal_Keyword: Late Triassic Temporal_Keyword: Middle Jurassic 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: GIS 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)451-5020 Contact_Electronic_Mail_Address: dggsgis@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Data_Set_Credit: This project is funded through the US Geological Survey's National Cooperative Geologic Mapping Program STATEMAP component (award number G14AC00167) and Governor's Strategic and Critical Minerals Assessment Capital Improvement Project, a component of the ongoing Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. Cross_Reference: Citation_Information: Originator: Benowitz, J.A. Originator: Layer, P.W. Originator: Twelker, Evan Publication_Date: 2014 Title: 40Ar/39Ar data from rocks collected in 2013 in the Wrangellia mineral assessment area, Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2014-18 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 10 p Online_Linkage: http://dx.doi.org/10.14509/29119 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Bachmann, E.N. Originator: Freeman, L.K. Originator: Newberry, R.J. Originator: Reioux, D.A. Originator: Sicard, K.R. Originator: Tuzzolino, A.L. Originator: Wright, T.C. Originator: Wypych, Alicja Publication_Date: 2014 Title: Major-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 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2014-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 6 p Online_Linkage: http://dx.doi.org/10.14509/27181 Cross_Reference: Citation_Information: Originator: Werdon, M.B. Originator: Azain, J.S. Originator: Granitto, Matthew Publication_Date: 2014 Title: Reanalysis of historical U.S. Geological Survey sediment samples for geochemical data from the western part of the Wrangellia terrane, Anchorage, Gulkana, Healy, Mt. Hayes, Nabesna, and Talkeetna Mountains quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2014-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 6 p Online_Linkage: http://dx.doi.org/10.14509/27287 Cross_Reference: Citation_Information: Originator: Wypych, Alicja Originator: Twelker, Evan Originator: Freeman, L.K. Originator: Lande, Lauren Originator: Newberry, R.J. Originator: Reioux, D.A. Originator: Sicard, K.R. Publication_Date: 2014 Title: Major-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 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2014-22 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: http://dx.doi.org/10.14509/29140 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Coordinates 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 location table was cross checked for consistency against the sample numbers recorded on the bags. Laboratory sample numbers were generated by the UAF geochronology, in some cases the lab numbers differ from those assigned by DGGS geologists. We provide both the lab and the DGGS sample numbers in the data tables. See text report for additional discussion of laboratory procedures. Note: sample 14LL220 FS#L1 was heated to fusion, the exact laser output level was not explicitly recorded. Lab results and interpretations were examined by several geologists to ensure that they are reasonable given the geologic context of the sample. Logical_Consistency_Report: not applicable Completeness_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 from the lab. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Sample location coordinates (in WGS84 datum) were obtained using handheld Trimble Juno T5 GPS units, with typical reported accuracy of about 10 m. 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. Sample location coordinates (in WGS84 datum) were obtained using handheld Trimble Juno T5 GPS units, with typical reported accuracy of about 10 m. Process_Date: 2014 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: 2014 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: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: rdf2015-10-border.shp Entity_Type_Definition: Outline of the study area Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: border Detailed_Description: Entity_Type: Entity_Type_Label: rdf2015-10-arar-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: arar-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: -148.944298 Range_Domain_Maximum: -148.435438 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: 62.401607 Range_Domain_Maximum: 62.735032 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_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the sample was a whole rock or that the mineral type was not recorded by the lab Enumerated_Domain_Value_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) 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 which 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 which 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: 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_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_M_AGE_MA Attribute_Definition: Weighted mean 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 mean 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: W_M_AGE_REMARKS Attribute_Definition: Comments and additional values that pertain to the weighted mean 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 W_M_AGE_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: 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_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 AGE_TYPE_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: rdf2015-10-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; note: sample 14LL220 FS#L1 was heated to fusion, the exact laser output level was not explicitly recorded Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 400 Range_Domain_Maximum: >9001 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: 0.0008 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: 8.83842 Range_Domain_Maximum: 687.05728 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: 0.01033 Range_Domain_Maximum: 151.04861 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: 0.0018 Range_Domain_Maximum: 35.85506 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: 0.00019 Range_Domain_Maximum: 4.49223 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: -0.03748 Range_Domain_Maximum: 2.07748 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: 0.5007 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: -21.9135 Range_Domain_Maximum: 100.00597 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: 0.05812 Range_Domain_Maximum: 38.70786 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: 0.00331 Range_Domain_Maximum: 67.49824 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: 0.00034 Range_Domain_Maximum: 8.45986 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: 0.0004 Range_Domain_Maximum: 0.3719 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: 0.00003 Range_Domain_Maximum: 0.0343 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: 0.0153 Range_Domain_Maximum: 67.18624 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: -0.08 Range_Domain_Maximum: 556.21 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: 0.13 Range_Domain_Maximum: 296.96 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 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA 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