Identification_Information: Citation: 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 Geospatial_Data_Presentation_Form: report,digital data 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 Description: Abstract: This DGGS report presents 40Ar/39Ar age dating results from selected mafic to intermediate intrusions encountered during a geological and geochemical resource assessment project in the Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles. Three intrusions returned mid-Cretaceous crystallization ages, while one olivine gabbro returned a Late Triassic crystallization age. Two altered or metamorphosed samples yielded Late Jurassic and Early Cretaceous ages. Analyses were performed by the University of Alaska Fairbanks Geochronology Laboratory, and results were reported by Paul Layer and Jeff Benowitz. Products included in this data release are: a summary of sample collection method; the laboratory report, analytical data tables and associated metadata; and plots of the 40Ar/39Ar age spectra, Ca/K ratios, and Cl/K ratios. All components of this data release are available on the DGGS website doi:10.14509/29119 at no charge. Purpose: Mineral-resources geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a helicopter-supported geological and geochemical resource assessment project in the Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles from July 29 through August 16, 2013. The objectives of this assessment were to improve the publicly-available geological, geophysical, and geochemical data in the area of known mineral occurrences in the Mount Hayes Quadrangle, and to extend this coverage and any insight gained westward into the less-explored extension of the Wrangellia terrane. A subset of rock samples was selected for 40Ar/39Ar age dating to allow us to better characterize and distinguish plutonic complexes and mineralization events, and to unravel the magmatic, structural, and metallogenic evolution of the area. Supplemental_Information: The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships and correspond to subdirectories within the data distribution package. The metadata layer provides an FGDC metadata file and may include other documentation files. Attribute information for each data layer is described in this metadata file under the "Entity_and_Attribute_Information" section. Data layer contents: >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: Single_Date/Time: Calendar_Date: 2014 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: as needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -148.807913 East_Bounding_Coordinate: -145.948239 North_Bounding_Coordinate: 63.221415 South_Bounding_Coordinate: 62.568967 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: Mineral Assessment Theme_Keyword: Mineral Deposit Theme_Keyword: Mineral Resources Theme_Keyword: Sample Location Theme_Keyword: Metamorphism Theme_Keyword: Platinum Group Elements Theme_Keyword: Skarn Theme_Keyword: Strategic and Critical Minerals Assessment Project Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Amphitheater Mountains Place_Keyword: Gulkana Quadrangle Place_Keyword: Healy Quadrangle Place_Keyword: Mount Hayes Quadrangle Place_Keyword: Talkeetna Mountains Quadrangle Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys 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: Jurassic Temporal_Keyword: Late 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: 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 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: 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 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 lab from the a list provided by DGGS. See text report for additional discussion of laboratory procedures. Lab results and interpretations were examined by the DGGS geologists to ensure that they are reasonable given the geologic context of the sample. Logical_Consistency_Report: No topologic relationships are present in the data. We plotted the data points using GIS software to ensure that they are correctly located and we visually reviewed the sample identification numbers and other attribute values to ensure that they are free of typological errors. 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Location coordinates (WGS84 datum) were collected using handheld GPS units, with a typical reported accuracy of about 10 m. Lineage: Process_Step: Process_Description: Fieldwork - Field geologists collected rock samples from surface outcrops. Care was taken to collect fresh, unweathered samples displaying, when possible, sufficiently large grains for mineral separate sampling. Process_Date: 2013 Process_Step: Process_Description: Sample preparation and analysis - Prior to processing, thin sections of the samples were petrographically inspected to ensure that mineral specimens selected for dating were free of alteration. 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: 2013 Process_Step: Process_Description: Tables were modified to better distinguish between plateau and weighted average ages. 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: rdf2014-18-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: rdf2014-18-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: LONGITUDE Attribute_Definition: Longitude, NAD27 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -148.807913 Range_Domain_Maximum: -145.948239 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: 62.568967 Range_Domain_Maximum: 63.221415 Attribute: Attribute_Label: DESCRIPTION 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: 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: 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: 46.9 Range_Domain_Maximum: 94.6 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: 0.75 Range_Domain_Maximum: 2.46 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: AVG_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 average age determination Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NULL Enumerated_Domain_Value_Definition: A NULL or blank values indicates that the AVG_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: AVG_AGE_MSWD Attribute_Definition: The mean square weighted deviation of the weighted average age calculation Attribute_Definition_Source: Geochronology Laboratory at the University of Alaska Fairbanks (UAF) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.81 Range_Domain_Maximum: 4.29 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: AVG_AGE_REMARKS Attribute_Definition: Comments and additional values that pertain to the weighted average 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 AVG_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_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: 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 isochon 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: rdf2014-18-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. The initials used by the geologists who collected samples for this project are: ET = Evan Twelker, LF = Larry K. Freeman and RN = Rainer J. Newberry 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: LATITUDE Attribute_Definition: Latitude, WGS 84 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 62.568967 Range_Domain_Maximum: 63.221415 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LONGITUDE Attribute_Definition: Longitude, WGS 84 Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -148.807913 Range_Domain_Maximum: -145.948239 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: DESCRIPTION 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: 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: 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: 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: 46.9 Range_Domain_Maximum: 94.6 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: 0.75 Range_Domain_Maximum: 4.29 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: 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: 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: 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 isochon 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: 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: PREFERRED Attribute_Definition: Indicates 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, or integrated. Attribute: Attribute_Label: LAB_NOTES Attribute_Definition: Additional information provided by the lab 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 Detailed_Description: Entity_Type: Entity_Type_Label: rdf2014-18-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. The initials used by the geologists who collected samples for this project are: ET = Evan Twelker, LF = Larry K. Freeman and RN = Rainer J. Newberry 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: 400 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: 0.0014 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: 18.78885 Range_Domain_Maximum: 2508.2839 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: 0.0256 Range_Domain_Maximum: 161.30494 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: 0.00658 Range_Domain_Maximum: 29.38999 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: 0.00074 Range_Domain_Maximum: 0.43729 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: -0.00162 Range_Domain_Maximum: 7.9404 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: 0.00013 Range_Domain_Maximum: 0.51505 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: -2.29196 Range_Domain_Maximum: 98.30294 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: 0.01208 Range_Domain_Maximum: 55.06959 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: 0.00136 Range_Domain_Maximum: 0.80998 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: 0.00243 Range_Domain_Maximum: 0.94538 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: 0.00005 Range_Domain_Maximum: 0.06149 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: 5.30942 Range_Domain_Maximum: 163.18502 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: 0.0442 Range_Domain_Maximum: 24.19149 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: 31.39 Range_Domain_Maximum: 778.17 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: 0.41 Range_Domain_Maximum: 93.68 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 Contact_Voice_Telephone: (907)451-5020 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