Identification_Information: Citation: Citation_Information: Originator: Benowitz, J.A. Originator: Layer, P.W. Originator: Freeman, L.K. Originator: Griesel, G.A. Originator: Elliott, B.A. Originator: Szumigala, D.J. Originator: Wypych, Alicja Originator: Montayne, Simone Publication_Date: 2018 Title: 40Ar/39Ar data from the eastern Moran area, Tanana B-6 and C-6 quadrangles, and the Ruby mining district, Ruby B-5 and B-6 quadrangles, Alaska Geospatial_Data_Presentation_Form: report and digital data Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2018-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 28 p. Online_Linkage: http://doi.org/10.14509/30117 Description: Abstract: This report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the eastern Moran area. Field samples were collected by the DGGS Mineral Resources section during detailed geologic mapping campaigns in 2011. The data provided in this report add significant detail to the thermal history of the Moran area. These new data indicate that the minimum age of prograde metamorphism of Ruby terrane rocks ranges from 148.5 +/- 1.7 to 140.4 +/- 1.7 Ma, and retrograde greenschist metamorphism is 122.6 +/- 2.3 Ma. The retrograde metamorphism is roughly coeval with the age of fabric development parallel to the Kaltag fault (128.3 +/- 1.7) and Tozitna thrust/detachment fault (123.2 +/- 1.5 Ma). The new data also indicate that the Melozitna pluton is composite, with a biotite cooling age of 116.5 +/- 1.3 from coarse-grained granite, while cooling ages for dikes cutting the granite range from 110.1 +/- 1.3 to 102.8 +/- 1.2 Ma. The age of mineralized veins in the area are variable and include 119.0 +/- 1.3 Ma galena veins in the Tozimoran drainage and an interpreted age of 66.5 +/- 2.6 for an auriferous vein from the Monday Creek area, which is synchronous with ages of biotite samples from granite and schist from the Ruby Mining district. The complete report and digital data are available through the DGGS website: http://doi.org/10.14509/30117. Purpose: This work was part of an integrated geological, geophysical, and geochemical mineral inventory study in the eastern Kokrines Hills near Moran Dome in the Tanana B-6 and C-6 quadrangles. Previous geologic work in the area is at a reconnaissance scale, although two localities in the study area have undergone detailed mineral-resource evaluations (Tozimoran Creek Placer and Monday Creek). No geochronological data from the area have been published, but limited geochronology has been published from the region. 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: 2011 Ending_Date: 2018 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -155.790105 East_Bounding_Coordinate: -152.604273 North_Bounding_Coordinate: 65.467821 South_Bounding_Coordinate: 64.463951 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: Batholith Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: Geochronology Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Igneous Theme_Keyword: Igneous Rocks Theme_Keyword: Isotopes Theme_Keyword: Lab Methods Theme_Keyword: Methods Theme_Keyword: Mineralogy Theme_Keyword: Minor Oxides Theme_Keyword: Rocks Theme_Keyword: STATEMAP Project Theme_Keyword: Sample Location Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alaska, State of Place_Keyword: Ash Creek Place_Keyword: Birch Creek Place_Keyword: Dominion Creek Place_Keyword: Kokrines Hills Place_Keyword: Melozitna Mining District Place_Keyword: Moran Creek Place_Keyword: Moran Dome Place_Keyword: Ruby Mining District Place_Keyword: Tozitna Creek Place_Keyword: West Tanana Prospect Place_Keyword: Yukon River Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Ruby Terrane Stratum_Keyword: Tozitna 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: Jurassic Temporal_Keyword: Triassic 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)451-5020 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 study is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature. The research was also supported by the U.S Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP award number G11AC20203. Access to Doyon Limited lands and to drill core from the Monday Creek prospect stored in Fairbanks, as well as permission to collect samples and publish data was kindly granted by Doyon Limited. Cross_Reference: Citation_Information: Originator: Freeman, L.K. Originator: Szumigala, D.J. Originator: Blessington, M.J. Originator: Werdon, M.B. Publication_Date: 2012 Title: Geochemical trace-element and rare-earth element data from stream-sediment and pan-concentrate samples collected in 2011 in the Melozitna mining district, Tanana and Melozitna quadrangles, interior Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2012-3 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/10.14509/23863 Cross_Reference: Citation_Information: Originator: Lough, T.A. Originator: Freeman, L.K. Originator: Elliott, B.A. Originator: Griesel, G.A. Originator: Newberry, R.J. Originator: Szumigala, D.J. Publication_Date: 2012 Title: Geochemical, major-oxide, minor-oxide, trace-element, and carbon data from rocks collected in 2011 in the Moran area, Tanana and Melozitna quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2011-4 v. 2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 176 p Online_Linkage: http://doi.org/10.14509/23002 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This data set is being released into the DGGS Raw Data File series. The information has been examined by several geologists familiar with the study area, but the data and accompanying report have not been formally reviewed for technical content or for conformity to the editorial standards of DGGS. Questions regarding the accuracy of the analytical values can be best answered by the originating lab. Logical_Consistency_Report: not applicable Completeness_Report: This data release is complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Location data for samples collected during the 2011 DGGS field campaign were derived using Garmin eTrex hand-held GPS units. Waypoints were downloaded from the eTrex units and merged with a hand-transcribed Microsoft Access field notes database on a daily basis, and locations were spot checked to ensure that the data merge was correct. Location error for this process is estimated to range between 3 and 20 m. The North American Datum of 1927 (NAD27) was used consistently for recording and reporting sample locations. Sample 11LF004A used the coordinates for the drill hole collar, which were transformed into NAD27 from World Geodetic System of 1984 coordinates provided by Doyon, Limited. The error for this sample is less than 10 m. Samples from the Ruby mining district were digitized from sample locations depicted on georeferenced images of scanned geologic map sheets (Puchner and others, 1998); these samples were collected prior to the use of GPS, and locations were hand plotted by geologists on USGS 1:63,360 topographic maps. Cumulative error for these locations could be in excess of 100 m. Sample RM 23241-R was collected from sluice box concentrates and the source is at or below the confluence of Ash and Tozimoran creeks. The location provided is for the creek confluence, and a location error of 1,000 m is assigned to this sample. Lineage: Process_Step: Process_Description: Fieldwork - Fresh, unweathered samples from surficial outcrops were collected by DGGS field geologists; samples were selected based on their cross-cutting relationships with structural features. Process_Date: 2011 Process_Step: Process_Description: Sample preparation and analysis - Before processing, samples were examined under a binocular microscope, or thin sections were prepared and scrutinized to eliminate the possibility of analyzing altered mineral phases. Rock samples suitable for dating by 40Ar/39Ar geochronology analysis were submitted to the Geochronology Laboratory at the University of Alaska Fairbanks (UAF) where they were dated according to the protocols outlined in the accompanying report. Additional sample preparation details may be found in the accompanying report. Process_Date: 2011 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.40000000037 Denominator_of_Flattening_Ratio: 294.978698199999997 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: rdf2018-5-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: The 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 the year the sample was collected, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database. Attribute: Attribute_Label: LAB_SAMPLE_NUMBER Attribute_Definition: The 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, NAD27 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -155.790105 Range_Domain_Maximum: -152.604273 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LATITUDE Attribute_Definition: Latitude, NAD27 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 64.463951 Range_Domain_Maximum: 65.467821 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: DESCRIPTION Attribute_Definition: Description of the sample Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: A brief sample or station description. 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: 49.1 Range_Domain_Maximum: 99.3 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: 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_M_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: W_M_AGE_PCT_39AR Attribute_Definition: Value in percent of the 39 Ar used in that portion of the spectrum to determine the weighted mean age Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 56.6 Range_Domain_Maximum: 56.6 Attribute_Units_of_Measure: percent Attribute: Attribute_Label: W_M_AGE_MSWD Attribute_Definition: The mean square weighted deviation of the weighted mean age calculation Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) 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: 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: Isochron 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: 0.13 Range_Domain_Maximum: 1.59 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: rdf2018-5-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: 300 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: 0.0011 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: 9.59019 Range_Domain_Maximum: 2155.92823 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: 0.05292 Range_Domain_Maximum: 142.8695 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: -0.22738 Range_Domain_Maximum: 38.19865 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: 0.00006 Range_Domain_Maximum: 1.31526 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: -0.01753 Range_Domain_Maximum: 7.05618 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: 0.00003 Range_Domain_Maximum: 0.46725 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: -28.45257 Range_Domain_Maximum: 98.48928 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: 0.03976 Range_Domain_Maximum: 51.8597 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: -0.41715 Range_Domain_Maximum: 72.03245 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: 0.00011 Range_Domain_Maximum: 2.47635 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: -0.00458 Range_Domain_Maximum: 0.23006 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: 0.01315 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: 2.85421 Range_Domain_Maximum: 73.04206 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: 0.04818 Range_Domain_Maximum: 38.81533 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: 20.47 Range_Domain_Maximum: 462.13 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: 0.55 Range_Domain_Maximum: 246.42 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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