Identification_Information: Citation: 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 Geospatial_Data_Presentation_Form: spreadsheet 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 Description: Abstract: Electron probe microanalyzer data collected on samples from the Chena and Steese projects, Yukon-Tanana Uplands, Alaska, Raw Data File 2025-13, provides electron probe microanalyzer (EPMA) geochemical data for individual mineral phases targeted in selected rock samples collected during the 2024 field season, along with one sample each from the 2023 and 1995 field seasons. EPMA is an analytical technique in which X-rays are excited by an electron beam. When introduced to an electron beam, each element produces X-rays with characteristic wavelengths. Therefore, EPMA allows for non-destructive quantitative analysis by comparing wavelength intensities of samples to those emitted from standards of known composition. The elements analyzed are presented as weight percent (wt.%) oxide (for most samples Na2O, MgO, Al2O3, SiO2, K2O, TiO2, CaO, FeO, and MnO; for ultramafic samples Cr2O3 instead of TiO2 and NiO instead of K2O). We do not report concentrations for elements present below detection limits-for example, TiO2, MgO, and MnO in plagioclase. The lithologies selected for electron microprobe analyses presented in this report include ultramafic, amphibolite, eclogite, schist, syenite, and paragneiss. The mineral phases analyzed from these samples include feldspar, amphibole, pyroxene, olivine, spinel, mica, garnet, epidote, chlorite, ilmenite, rutile, tourmaline, serpentine, and aluminosilicates. These data and report are available from the DGGS website: http://doi.org/10.14509/31537. Purpose: To advance geological research in interior Alaska, we conducted electron probe microanalyzer (EPMA) analyses to obtain detailed geochemical data from individual mineral phases within selected rock samples. These data supported five principal objectives: (1) characterizing ultramafic rocks from the Seventymile Terrane and comparing them with lithologies of uncertain origin in adjacent Earth MRI areas; (2) clarifying the metamorphic identity of eclogitic and amphibolite-like rocks within the Chatanika assemblage; (3) analyzing mineral compositions to distinguish among diverse amphibolite units; (4) estimating pressure-temperature conditions to evaluate contrasts between assemblages; and (5) resolving ambiguities surrounding mafic phases associated with the Roy Creek intrusion. Collectively, this work contributes to a broader understanding of lithologic variability, metamorphic evolution, and geochemical diversity across the Yukon-Tanana Uplands. Supplemental_Information: >data: Analytical lab data and accompanying data dictionary >sample-summary: Summary data spreadsheet and accompanying data dictionary Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2023 Ending_Date: 2025 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -147.658324 East_Bounding_Coordinate: -143.842385 North_Bounding_Coordinate: 65.484846 South_Bounding_Coordinate: 64.361696 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: Amphibole Theme_Keyword: Amphibolite Theme_Keyword: Analyses Theme_Keyword: Analytical Lab Results Theme_Keyword: Analytical Results Theme_Keyword: Augite Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: Biotite Theme_Keyword: Chemistry Theme_Keyword: Chlorite Theme_Keyword: Chromite Theme_Keyword: Clinopyroxene Theme_Keyword: Clinozoisite Theme_Keyword: DGGS Theme_Keyword: Diopside Theme_Keyword: Earth MRI Theme_Keyword: Economic Geology Theme_Keyword: Enstatite Theme_Keyword: Epidote Theme_Keyword: Exploration Theme_Keyword: Garnet Theme_Keyword: Geochemical Data Theme_Keyword: Geochemical Surveys Theme_Keyword: Geochemistry Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Hornblende Theme_Keyword: Ilmenite Theme_Keyword: Intrusive Theme_Keyword: K-Feldspar Theme_Keyword: Kyanite Theme_Keyword: Lab Methods Theme_Keyword: Magnetite Theme_Keyword: Major Oxides Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Grade Theme_Keyword: Metamorphic Minerals Theme_Keyword: Metamorphic Rocks Theme_Keyword: Metamorphism Theme_Keyword: Methods Theme_Keyword: Mineral Resources Theme_Keyword: Minerals Theme_Keyword: Mining Theme_Keyword: Muscovite Theme_Keyword: Olivine Theme_Keyword: Omphacite Theme_Keyword: Paragonite Theme_Keyword: Petrographic Theme_Keyword: Petrology Theme_Keyword: Plagioclase Theme_Keyword: Quartz Theme_Keyword: Resource Assessment Theme_Keyword: Resource Information Theme_Keyword: Resources Theme_Keyword: Rocks Theme_Keyword: Rutile Theme_Keyword: Serpentine Theme_Keyword: Sillimanite Theme_Keyword: Spinel Theme_Keyword: Titanite Theme_Keyword: Tourmaline Theme_Keyword: Tremolite Theme_Keyword: Ultramafic Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alder Creek Place_Keyword: Bedrock Creek Place_Keyword: Boulder Creek Place_Keyword: Captain Creek Place_Keyword: Chatanika Place_Keyword: Circle Mining District Place_Keyword: Cleary Creek Place_Keyword: Cora Creek Place_Keyword: Cottonwood Creek Place_Keyword: Dome Creek Place_Keyword: Dora Creek Place_Keyword: Fairbanks Mining District Place_Keyword: Gulch Creek Place_Keyword: Last Chance Creek Place_Keyword: Lost Creek Place_Keyword: Lulu Creek Place_Keyword: Munson Creek Place_Keyword: Newsboy Mine Place_Keyword: Olympia Creek Place_Keyword: Paldo Creek Place_Keyword: Richardson Mining District Place_Keyword: Rosa Creek Place_Keyword: Ruby Creek Place_Keyword: Salcha River Place_Keyword: Serpentine Creek Place_Keyword: Sheep Creek Place_Keyword: Sorrels Creek Place_Keyword: Tolovana Mining District Place_Keyword: Vault Creek Place_Keyword: Williams Creek Place_Keyword: Willow Creek Place_Keyword: Yukon-Tanana Upland Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Chatanika Terrane Stratum_Keyword: Fortymile River Assemblage Stratum_Keyword: Lake George Assemblage Stratum_Keyword: Seventymile Terrane 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: We thank Nathan Graham for his assistance at the University of Alaska Fairbanks Advanced Instrumentation Laboratory. The DGGS Chena and Steese projects are funded by the State of Alaska and the U.S. Geological Survey's (USGS) Earth Mapping Resources Initiative (Earth MRI) program under Cooperative Agreement numbers G24AC00323 and G23AC00372. 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 USGS. Mention of trade names or commercial products does not constitute their endorsement by the USGS. Cross_Reference: Citation_Information: Originator: Buchanan, J.W. Originator: Wypych, Alicja Originator: Barrera, M.L. Originator: Biegel, J.M. Originator: Gavel, M.M. Originator: Harvey, D.A. Originator: Ketcham, R.A. Originator: Muller, I.P. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Regan, S.P. Originator: Szumigala, D.J. Originator: Twelker, Evan Originator: Wildland, A.D. Publication_Date: 2025 Title: Geochemical data from samples collected in 2023 for the Chena and Mount Harper projects, Big Delta, Circle, Fairbanks, and Eagle quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2024-2 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/10.14509/31123 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: Newberry, R.J. Originator: Bundtzen, T.K. Originator: Clautice, K.H. Originator: Combellick, R.A. Originator: Douglas, Tom Originator: Laird, G.M. Originator: Liss, S.A. Originator: Pinney, D.S. Originator: Reifenstuhl, R.R. Originator: Solie, D.N. Publication_Date: 1996 Title: Preliminary geologic map of the Fairbanks mining district, Alaska Series_Information: Series_Name: Public Data File Issue_Identification: PDF 96-16 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 17 p., 2 sheets, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/1740 Cross_Reference: Citation_Information: Originator: Newberry, R.J. Originator: Twelker, Evan Publication_Date: 2021 Title: Metamorphism of the Ladue River-Mount Fairplay area Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2021-5B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: p. 33-39 Online_Linkage: https://doi.org/10.14509/30736 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Newberry, R.J. Originator: Naibert, T.J. Originator: Wypych, Alicja Publication_Date: 2025 Title: Bedrock geologic map of the Richardson Mining District, Big Delta Quadrangle, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2025-2A Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:100,000 Online_Linkage: https://doi.org/10.14509/31649 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. The devices have reported errors between 10 and 12 m. Latitude and longitude are reported in the WGS84 datum. Lineage: Process_Step: Process_Description: Sample collection - DGGS geologists collected rock samples furing the 2024 field season while conducting 1:100,000-scale bedrock geologic mapping of a 9,635 km2 (~3,720 mi2) area of the Yukon-Tanana Uplands of eastern Interior Alaska Process_Date: 2024 Process_Step: Process_Description: Analytical methods - DGGS staff used an electron probe microanalyzer (EPMA) to analyze individual mineral phases in selected rock samples from the 2024 field season, along with one sample each from 2023 and 1995. Their selections for electron microprobe analysis included ultramafic, amphibolite, eclogite, schist, syenite, and paragneiss lithologies. They targeted mineral phases such as feldspar, amphibole, pyroxene, olivine, spinel, mica, garnet, epidote, chlorite, ilmenite, rutile, tourmaline, serpentine, and aluminosilicates. They reported elemental concentrations as weight percent oxides-typically Na2O, MgO, Al2O3, SiO2, K2O, TiO2, CaO, FeO, and MnO, with Cr2O3 and NiO replacing TiO2 and K2O in ultramafic samples. 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_013_EPMA_data.csv, rdf2025_013_EPMA_data_dictionary.csv Entity_Type_Definition: Analytical lab data and accompanying data dictionary Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: data Detailed_Description: Entity_Type: Entity_Type_Label: rdf2025_013_EPMA_sample_summary.csv, rdf2025_013_EPMA_sample_summary_data_dictionary.csv Entity_Type_Definition: Summary data spreadsheet and accompanying data dictionary Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: sample-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 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 2025-13 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. 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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