Identification_Information: Citation: Citation_Information: Originator: Todd, Erin Originator: Wypych, Alicja Originator: Kylander-Clark, Andrew Publication_Date: 2019 Title: U-Pb and Lu-Hf isotope, age, and trace element data from zircon separates from the Tanacross D-1, and parts of D-2, C-1, and C-2 quadrangles Geospatial_Data_Presentation_Form: report and digital data Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2019-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 10 p. Online_Linkage: http://doi.org/10.14509/30198 Description: Abstract: This Alaska Division of Geological & Geophysical Surveys (DGGS) Raw Data File presents U-Pb geochronology, Lu-Hf isotopic compositions, and trace-element composition of zircons from six metaigneous and igneous rocks sampled during investigations by DGGS geologists in the northeastern Tanacross quadrangle. The purpose of the Lu-Hf and U-Pb isotopic study is to better understand the Devonian-to-Mississippian and Mesozoic-to-early Paleogene episodes of magmatic and tectonic evolution of the Yukon-Tanana Uplands and the significance of magmatism to the formation of metallic mineral deposits. Products included in this data release are: A summary of sample collection methods, the laboratory report, analytical data tables, and associated metadata. All files are available from the DGGS website: http://doi.org/10.14509/30198. Purpose: The DGGS Northeast Tanacross project is a part of multi-year effort to better understand the mineral potential of the Yukon-Tanana Uplands region in collaboration with the U.S. Geological Survey. This area is characterized by the presence of two Devonian to Mississippian metamorphic assemblages-the Lake George and Fortymile assemblages. Both assemblages are composed of metasedimentary rocks intruded by orthogneiss and amphibolite. The Lake George assemblage also contains extensive potassium feldspar augen gneiss. Following metamorphism, both assemblages were intruded by mid- to Late-Cretaceous volcanic and plutonic rocks with high potential for gold, but also silver, zinc, copper, and lead mineralization. Supplemental_Information: >geochron-data: Geochronology lab files and applicable documentation. >geochron-summary: Identification numbers, coordinates, sample descriptions, and summary ages of each sample. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -141.545659 East_Bounding_Coordinate: -141.204038 North_Bounding_Coordinate: 63.881070 South_Bounding_Coordinate: 63.642767 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Age Dates Theme_Keyword: Analyses Theme_Keyword: Geochronology Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Hafnium Theme_Keyword: Isotopes Theme_Keyword: Lutetium Theme_Keyword: Mineral Composition Theme_Keyword: Mineral Deposit Theme_Keyword: Mineral Resources Theme_Keyword: Minerals Theme_Keyword: Sample Location Theme_Keyword: U-Pb Theme_Keyword: Zircon Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Tanacross Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Fortymile Assemblage Stratum_Keyword: Lake George Assemblage 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: Devonian Temporal_Keyword: Late Cretaceous Temporal_Keyword: Paleocene Temporal_Keyword: Proterozoic 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: The isotopic analyses in this report were funded through a cooperative partnership with the U.S. Geological Survey and the DGGS. The Northeast Tanacross project was funded by Alaska State General Funds. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Cross_Reference: Citation_Information: Originator: Naibert, T.J. Originator: Benowitz, J.A. Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Twelker, Evan Publication_Date: 2018 Title: 40Ar/39Ar data from the Tanacross D-1 and D-2, Big Delta B-4 and B-5, and Mount Hayes A-6 quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2018-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 15 p Online_Linkage: http://doi.org/10.14509/30112 Cross_Reference: Citation_Information: Originator: Wypych, Alicja Originator: Twelker, Evan Originator: Athey, J.E. Originator: Lockett, A.C. Originator: Naibert, T.J. Originator: Sicard, K.R. Originator: Werdon, M.B. Originator: Willingham, A.L. Publication_Date: 2017 Title: Major-oxide and trace-element geochemical data from rocks collected in the Tanacross C-1, D-1, and D-2 quadrangles, Alaska in 2017 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-10 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: http://doi.org/10.14509/29778 Cross_Reference: Citation_Information: Originator: Wypych, Alicja Originator: Hubbard, T.D. Originator: Naibert, T.J. Originator: Athey, J.E. Originator: Newberry, R.J. Originator: Sicard, K.R. Originator: Twelker, Evan Originator: Werdon, M.B. Originator: Willingham, A.L. Originator: Wyatt, W.C. Originator: Lockett, A.C. Publication_Date: 2019 Title: Northeastern Tanacross geologic map, Tanacross D-1, D-2, C-1, and C-2 quadrangles, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2019-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 20 p., 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/30197 Cross_Reference: Citation_Information: Originator: Wypych, Alicja Originator: Naibert, T.J. Originator: Athey, J.E. Originator: Newberry, R.J. Originator: Sicard, K.R. Originator: Twelker, Evan Originator: Werdon, M.B. Originator: Willingham, A.L. Originator: Wyatt, W.C. Publication_Date: 2018 Title: Major-oxide and trace-element geochemical data from rocks collected in 2018 for the Northeast Tanacross project, Tanacross C-1, C-2, D-1, and D-2 quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2018-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: http://doi.org/10.14509/30113 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This data set is being released in the DGGS Raw Data File series. The information has been examined by several geologists familiar with the study area, but the data and accompanying report have not been formally reviewed for technical content or for conformity to the editorial standards of DGGS. Questions regarding the accuracy of the analytical values can be best answered by the originating lab. Logical_Consistency_Report: not applicable Completeness_Report: This data release is complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Sample locations were obtained using Trimble Juno T41/5 WAAS-enabled GPS devices running ArcGIS for Windows Mobile. WAAS-enabled GPS devices have a reported error of about 1 m. Lineage: Process_Step: Process_Description: Sample selection - DGGS field geologists collected fresh, unweathered samples from bedrock outcrops in 2017. Samples for geochronology analyses were selected based on examination of bulk samples under a binocular microscope and thin section petrography to minimize the potential for analyzing altered mineral phases. Process_Date: 2017 Process_Step: Process_Description: Data analysis - Zircon grains were extracted by Zirchron LLC (Tucson, AZ). Hf isotopes, U-Pb ratios, and trace-element compositions for all zircons were measured simultaneously at the University of California, Santa Barbara (UCSB) by laser ablation split-stream (LASS) using the Photon Machines Analyte 193-nm excimer laser. Processing details and parameters can found in the accompanying report. Process_Date: 2018 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: World Geodetic System of 1984 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257223563000025 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: rdf2019-5-geochron-data, rdf2019-5-geochron-data-metadata Entity_Type_Definition: Geochronology lab files and applicable documentation. Entity_Type_Definition_Source: this report Entity_Attribute_Layer_Name: geochron-data Detailed_Description: Entity_Type: Entity_Type_Label: rdf2019-5-geochron-summary.csv, rdf2019-5-geochron-summary-metadata.csv Entity_Type_Definition: Identification numbers, coordinates, sample descriptions, and summary ages of each sample. Entity_Type_Definition_Source: this report Entity_Attribute_Layer_Name: geochron-summary Distribution_Information: Distributor: 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 Resource_Description: RDF 2019-5 Distribution_Liability: The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Standard_Order_Process: Non-digital_Form: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII tabular files Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://doi.org/10.14509/30198 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20190719 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Person: Simone Montayne 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 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. Metadata_Extensions: Online_Linkage: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions