Identification_Information: Citation: Citation_Information: Originator: Buchanan, J.W. Originator: Barrera, M.L. Originator: Moshrefzadeh, J.A. Originator: Truskowski, C.M. Originator: Newberry, R.J. Publication_Date: 2025 Title: LA-ICP-MS uranium-lead zircon data from samples in the Chena and Steese project areas Geospatial_Data_Presentation_Form: spreadsheet Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-25 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p. Online_Linkage: https://doi.org/10.14509/31731 Description: Abstract: LA-ICP-MS uranium-lead zircon data from samples in the Chena and Steese project areas, Raw Data File 2025-25, provides uranium-lead (U-Pb) geochronologic data and trace and rare earth element (TREE) data from single zircon spots analyzed using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The two methods were run concurrently resulting in U-Pb age data and TREE data from the same zircon volume. Alaska Division of Geological & Geophysical Surveys (DGGS) staff collected zircon data from 51 samples of igneous and meta-igneous rocks primarily collected during the 2024 field season in support of the Earth Mapping Resources Initiative (Earth MRI) Steese and Chena projects. The goal of this dataset is to delineate the age of igneous activity to support geologic mapping efforts, tectonic interpretations, and characterization of mineralization in the Yukon-Tanana Uplands, Alaska. Data are organized in the age summary data table with our interpreted crystallization ages, sample location information, and sample descriptions. The zircon grain data table contains U-Pb isotopic age data and TREE data for each zircon spot analyzed. These data are provided as a Raw Data File under an open end-user license and are available on the DGGS website: http://doi.org/10.14509/31731. Purpose: This dataset provides U-Pb zircon age data from igneous rocks in Interior Alaska to refine geologic maps, improve understanding of mineralizing systems, and guide resource exploration. By supporting the Earth MRI initiative, it enhances Alaska's ability to evaluate mineral potential, strengthen economic development, and manage natural resources for the benefit of the state. Supplemental_Information: >chena_steese-zircon: Data spreadsheets and accompanying data dictionaries Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2025 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -148.392677 East_Bounding_Coordinate: -143.814911 North_Bounding_Coordinate: 65.491436 South_Bounding_Coordinate: 64.289053 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Actinolite Theme_Keyword: Albite Theme_Keyword: Allanite Theme_Keyword: Amphibole Theme_Keyword: Analyses Theme_Keyword: Analyses and Sampling Theme_Keyword: Analytical Lab Results Theme_Keyword: Apatite Theme_Keyword: Aplite Theme_Keyword: Augite Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: Biotite Theme_Keyword: Calcite Theme_Keyword: Chlorite Theme_Keyword: Clinopyroxene Theme_Keyword: Clinozoisite Theme_Keyword: DGGS Theme_Keyword: Dike Theme_Keyword: Diorite Theme_Keyword: Disseminated Theme_Keyword: Earth MRI Theme_Keyword: Epidote Theme_Keyword: Feldspar Theme_Keyword: Felsic Theme_Keyword: Fluorite Theme_Keyword: Gabbro Theme_Keyword: Geochronology Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Greenschist Theme_Keyword: Igneous Theme_Keyword: Igneous Rocks Theme_Keyword: Isotopes Theme_Keyword: LA-ICPMS Theme_Keyword: Lab Methods Theme_Keyword: Metaigneous Units Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Rocks Theme_Keyword: Metamorphism Theme_Keyword: Methods Theme_Keyword: Mineral Assessment Theme_Keyword: Mineral Deposit Models Theme_Keyword: Mineral Deposits Theme_Keyword: Mineral Exploration Theme_Keyword: Mineral Localities Theme_Keyword: Mineral Resources Theme_Keyword: Minerals Theme_Keyword: Radioactive Minerals Theme_Keyword: Rare Earth Elements Theme_Keyword: Resources Theme_Keyword: Rhyolite Theme_Keyword: Rocks Theme_Keyword: U-Pb Theme_Keyword: U-Pb Zircon Theme_Keyword: Uranium Theme_Keyword: Zircon Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alder Creek Place_Keyword: American Creek Place_Keyword: Approach Hill Place_Keyword: Barnes Creek Place_Keyword: Bathing Beauty Pond Place_Keyword: Big Windy Creek Place_Keyword: Birch Hill Place_Keyword: Caribou Creek Place_Keyword: Chena River Place_Keyword: Circle Mining District Place_Keyword: Clear Creek Place_Keyword: Columbia Creek Place_Keyword: Dawson Creek Place_Keyword: Deadwood Creek Place_Keyword: Deep Creek Place_Keyword: Fairbanks Place_Keyword: Fairbanks Mining District Place_Keyword: Far Mountain Place_Keyword: Flat Creek Place_Keyword: French Creek Place_Keyword: Gilmore Dome Place_Keyword: Goodpaster Mining District Place_Keyword: Hope Creek Place_Keyword: Lundgren Pond Place_Keyword: Marten Creek Place_Keyword: Mastadon Creek Place_Keyword: Melba Creek Place_Keyword: Monte Cristo Creek Place_Keyword: Monument Creek Place_Keyword: Moose Creek Place_Keyword: Munson Creek Place_Keyword: Murphy Dome Place_Keyword: Ottertail Creek Place_Keyword: Portage Creek Place_Keyword: Rock Creek Place_Keyword: Serpentine Creek Place_Keyword: Shovel Creek Place_Keyword: Silver Creek Place_Keyword: Sourdough Creek Place_Keyword: Stuart Creek Place_Keyword: Switch Creek Place_Keyword: Table Mountain Place_Keyword: Tanana River Place_Keyword: Tolovana Mining District Place_Keyword: Wigwam Creek Place_Keyword: Wolf Creek Place_Keyword: Woodchopper Creek Place_Keyword: Yukon-Tanana Upland 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: Albian Temporal_Keyword: Aptian Temporal_Keyword: Campanian Temporal_Keyword: Cenomanian Temporal_Keyword: Cenozoic Temporal_Keyword: Eocene Temporal_Keyword: Maastrichtian Temporal_Keyword: Mesozoic Temporal_Keyword: Mississippian Temporal_Keyword: Ordovician Temporal_Keyword: Paleocene Temporal_Keyword: Paleozoic 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 Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Data_Set_Credit: The authors thank the University of Arizona LaserChron Center staff for their contributions to data collection, technical discussions, and other support. The analytical work was funded by the U.S. Geological Survey's Earth Mapping Resources Initiative (Earth MRI) under cooperative agreement G24AC00323 and by the State of Alaska. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey. Cross_Reference: Citation_Information: Originator: Moshrefzadeh, J.A. Originator: Newberry, R.J. Publication_Date: 2025 Title: Electron probe microanalyzer data collected on samples from the Chena and Steese projects, Yukon-Tanana Uplands, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-13 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 6 p Online_Linkage: https://doi.org/10.14509/31537 Cross_Reference: Citation_Information: Originator: Moshrefzadeh, J.A. Originator: Buchanan, J.W. Originator: Naibert, T.J. Originator: Twelker, Evan Originator: Newberry, R.J. Originator: Szumigala, D.J. Originator: Barrera, M.L. Originator: Norwood, L.P. Originator: Acosta, M.D. Originator: Regan, S.P. Publication_Date: 2025 Title: Field station locations and magnetic susceptibility data collected in 2024 for the Chena and Steese projects, Yukon-Tanana Uplands, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 5 p Online_Linkage: https://doi.org/10.14509/31476 Cross_Reference: Citation_Information: Originator: Moshrefzadeh, Jamshid Originator: Acosta, M.D. Originator: Barrera, M.L. Originator: Buchanan, J.W. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Norwood, L.P. Originator: Regan, S.P. Originator: Szumigala, D.J. Originator: Twelker, Evan Publication_Date: 2025 Title: Geochemical data from samples collected in 2024 for the Chena and Steese projects, Big Delta, Circle, Fairbanks, and Livengood quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-17 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: https://doi.org/10.14509/31692 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The accompanying report and data tables provide a comprehensive discussion of processing methods, with errors reported in the tables where applicable. This data is being released as part of the DGGS RDF series, which includes content describing approved techniques and methods for the collection, storage, visualization, analysis, and interpretation of scientific data. While the information has been reviewed by several geologists familiar with the study area, the data and report have not undergone formal review for technical content or conformity to DGGS editorial standards. For inquiries regarding analytical values or procedures, the originating lab is the best point of contact. Logical_Consistency_Report: Not applicable Completeness_Report: This data release is complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Location data for field stations were collected using GPS-enabled tablets or smartphones running the Esri Field Maps app. Data were merged into an ArcGIS geodatabase. The devices have a reported error of 10-12 m. Lineage: Process_Step: Process_Description: Sample selection - Field staff collected fresh, unaltered felsic to intermediate igneous rocks (e.g., granite, rhyolite, porphyry dikes) and, in metamorphic terrains orthogneiss or felsic layers likely to contain zircon. Approximately 2-3 kg of material was sampled from unweathered interiors, avoiding heavily altered rocks. Each sample location was documented with GPS coordinates, lithologic descriptions, and geologic context including contacts and intrusive relationships. Samples were later processed to separate zircon grains for U-Pb geochronology and trace/rare earth element analysis using LA-ICP-MS. Process_Date: 2025 Process_Step: Process_Description: Analytical methods - Samples were processed to separate zircon grains for U-Pb geochronology and trace and rare earth element (TREE) analysis using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Analytical procedures followed established techniques described by Gehrels et al. (2008), Gehrels and Pecha (2014), Pullen et al. (2018), and Sundell et al. (2021). Additional details on laboratory methods and data reduction are provided in the accompanying report. Process_Date: 2025 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000001 Longitude_Resolution: 0.0000001 Geographic_Coordinate_Units: decimal degrees Geodetic_Model: Horizontal_Datum_Name: NAD83 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: rdf2025-25_chena_steese-zircon_grain_data.csv, rdf2025-25_chena_steese-zircon_grain_data_dictionary.csv, rdf2025-25_chena_steese-zircon-age_summary.csv, rdf2025-25_chena_steese-zircon-age_summary_data_dictionary.csv Entity_Type_Definition: Data spreadsheets and accompanying data dictionaries Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: chena_steese-zircon 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 Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: RDF 2025-25 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: spreadsheet Format_Version_Date: 20251117 Format_Information_Content: table Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/31731 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20251117 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: Simone Montayne 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: https://dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions