Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska

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Frequently anticipated questions:

What does this data set describe?

Title:
Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska
Abstract:
Report of Investigation 2020-7, Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska, presents interpreted bedrock geology for a portion of the northeastern Talkeetna Mountains and the eastern Alaska Range that is primarily underlain by Pennsylvanian through Triassic rocks of the Wrangellia terrane, plus structurally emplaced Jurassic through Cretaceous metasedimentary rocks that formed north and east of Wrangellia prior to its accretion to North America. It provides the geologic framework for known and potential mineral resources related to the geology of Wrangellia, including magmatic nickel-copper-cobalt-platinum group element deposits hosted by Late Triassic mafic and ultramafic intrusions, copper-silver deposits related to metamorphism of the Late Triassic Nikolai Greenstone, and copper-gold skarn deposits associated with Early Cretaceous plutonism. This map synthesizes and reinterprets multiple generations of geologic maps, geophysical surveys, geochemistry, and geochronology, plus incorporates targeted field observations by geologists from the Alaska Division of Geological & Geophysical Surveys, the University of Alaska, and the University of California, Davis. Additional discussion of the geology and mineral potential of the map area is presented in a companion report, Twelker and others (2020). The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/30469.
Supplemental_Information:
This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Ekberg, P.G., Athey, J.E., Wyatt, W.C., Willingham, A.L., and Naibert, T.J., 2021, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170, 10 p. https://doi.org/10.14509/30669. The distribution package includes ESRI fonts and style files, along with usage instructions. Further documentation of the symbology is provided by Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 169, 7 p. https://doi.org/10.14509/30584
  1. How might this data set be cited?
    Twelker, Evan, Waldien, T.S., Newberry, R.J., Freeman, L.K., Sicard, K.R., Lande, L.L., Wypych, Alicja, Reioux, D.A., and Bachmann, E.N., 2020, Bedrock geologic map of the eastern Denali Highway area, Mount Hayes, Healy, and Talkeetna Mountains quadrangles, Alaska: Report of Investigation RI 2020-7, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:100,000
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -148.018382
    East_Bounding_Coordinate: -145.480935
    North_Bounding_Coordinate: 63.373879
    South_Bounding_Coordinate: 62.832423
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2013
    Ending_Date: 2020
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: geodatabase
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a vector data set.
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -147
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      Planar coordinates are specified in Meters
      The horizontal datum used is NAD83.
      The ellipsoid used is GRS 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    wrangellia_ak_gems_db_pkg
    Geodatabase, layer files, style files, and fonts (Source: DGGS)
    wrangellia_gems_db_pkg
    Geodatabase, layer files, style files, and fonts (Source: DGGS)
    wrangellia_gems_shapefile_pkg
    Shapefiles and open data files (Source: DGGS)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    The Alaska Legislature funded this project as part of the State of Alaska's Strategic and Critical Minerals Assessment project, part of the Division of Geological & Geophysical Survey's Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. Mapping and geochronology by Trevor S. Waldien was supported by U.S. Geological Survey Award No. G16AC00206.
  3. To whom should users address questions about the data?
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    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.

Why was the data set created?

The Wrangellia geologic mapping project was a multi-year project to understand and improve the geologic framework of the Wrangellia geologic belt, with particular emphasis on evaluating the potential of the area to host magmatic-type nickel, copper, and platinum-group-element (Ni-Cu-PGE) deposits.

How was the data set created?

  1. From what previous works were the data drawn?
    Benowitz, J.A. and others, 2015 (source 1 of 14)
    Benowitz, J.A., Layer, P.W., Wypych, Alicja, and Twelker, Evan, 2015, 40Ar/39Ar data from the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska: Raw Data File RDF 2015-10, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 19 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Benowitz, J.A. and others, 2017 (source 2 of 14)
    Benowitz, J.A., Layer, P.W., Wypych, Alicja, and Twelker, Evan, 2017, 40Ar/39Ar data from rocks collected in the 2015 Wrangellia mineral assessment project area, Mount Hayes A-5, Mount Hayes B-6, and Talkeetna Mountains D-2 quadrangles, Alaska: Raw Data File RDF 2017-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 9 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Benowitz, J.A. and others, 2014 (source 3 of 14)
    Benowitz, J.A., Layer, P.W., and Twelker, Evan, 2014, 40Ar/39Ar data from rocks collected in 2013 in the Wrangellia mineral assessment area, Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles, Alaska: Raw Data File RDF 2014-18, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 10 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Burns, L.E. and others, 2019 (source 4 of 14)
    Burns, L.E., Barefoot, J.D., Naibert, T.J., and Fugro GeoServices, Inc., 2019, Wrangellia electromagnetic and magnetic airborne geophysical survey (data compilation): Geophysical Report GPR 2018-8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 3 p
    Type_of_Source_Media: paper
    Source_Contribution: Bedrock mapping
    Ekberg, P.G. and others, 2021 (source 5 of 14)
    Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Miscellaneous Publication MP 169, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 7 p
    Type_of_Source_Media: paper
    Source_Contribution: GIS analysis and digital cartography
    Hendricks, M.D. and others, 2021 (source 6 of 14)
    Hendricks, M.D., Ekberg, P.G., Athey, J.E., Wyatt, W.C., Willingham, A.L., and Naibert, T.J., 2021, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Miscellaneous Publication MP 170, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 10 p
    Type_of_Source_Media: paper
    Source_Contribution: GIS analysis and digital cartography
    Holm-Denoma, C.S. and others, 2020 (source 7 of 14)
    Holm-Denoma, C.S., Sicard, K.R., and Twelker, Evan, 2020, U-Pb geochronology of igneous and detrital zircon samples from the Tok River area, eastern Alaska Range, and Talkeetna Mountains, Alaska: Raw Data File RDF 2020-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 20 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Naibert, T.J. and others, 2018 (source 8 of 14)
    Naibert, T.J., Benowitz, J.A., Wypych, Alicja, Sicard, K.R., and Twelker, Evan, 2018, 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: Raw Data File RDF 2018-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 15 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Todd, Erin and others, 2017 (source 9 of 14)
    Todd, Erin, Kylander-Clark, Andrew, Wypych, Alicja, Twelker, Evan, and Sicard, K.R., 2017, U-Pb and Lu-Hf isotope, age, and trace-element data from zircons at four sites in the western Alaska Range and Talkeetna Mountains, Alaska: Raw Data File RDF 2017-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 7 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Twelker, Evan and others, 2014 (source 10 of 14)
    Twelker, Evan, Bachmann, E.N., Freeman, L.K., Newberry, R.J., Reioux, D.A., Sicard, K.R., Tuzzolino, A.L., Wright, T.C., and Wypych, Alicja, 2014, 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: Raw Data File RDF 2014-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 6 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Twelker, Evan and O'Sullivan, P.B., 2016 (source 11 of 14)
    Twelker, Evan, and O'Sullivan, P.B., 2016, U-Pb zircon age data from meta-igneous rocks in the Clearwater Mountains, Mount Hayes A-6 Quadrangle, Alaska: Raw Data File RDF 2016-8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 17 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 (source 12 of 14)
    U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps: Techniques and Methods TM 11-B10, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: 1 p
    Type_of_Source_Media: paper
    Source_Contribution: GIS analysis and digital cartography
    Wypych, Alicja and others, 2014 (source 13 of 14)
    Wypych, Alicja, Twelker, Evan, Freeman, L.K., Lande, Lauren, Newberry, R.J., Reioux, D.A., and Sicard, K.R., 2014, Major-oxide and trace-element geochemical data from rocks collected in 2014 in the Wrangellia mineral assessment area, Talkeetna Mountains C-4, C-3, and B-4 quadrangles, Alaska: Raw Data File RDF 2014-22, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 4 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Wypych, Alicja and others, 2015 (source 14 of 14)
    Wypych, Alicja, Twelker, Evan, Freeman, L.K., Lande, Lauren, Newberry, R.J., Reioux, D.A., and Sicard, K.R., 2015, Major-oxide and trace-element geochemical data from rocks collected in 2015 in the Wrangellia mineral assessment area, Alaska: Raw Data File RDF 2015-16, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 4 p
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 4)
    Bedrock mapping - DGGS geologists conducted geologic mapping throughout the Wrangellia field area during the 2013 through 2015 field seasons. During the initial 2013 field season, mineral resources geologists from DGGS carried out a 19-day, helicopter-supported geological and geochemical resource assessment and gravity survey in parts of the Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles. In 2015, DGGS geologists completed an additional 10 days of targeted mapping and sampling in the Butte Creek, Windy Creek, and Eureka Creek areas. This campaign targeted unresolved geologic relationships in the northeastern Talkeetna Mountains, Clearwater Mountains, and the Eureka Creek area, with special emphasis on tracing suspected, unmapped Late Triassic mafic and ultramafic intrusions and volcanic rocks indicated in previous reports and geophysical surveys. DGGS also worked in cooperation with Trevor Waldien, a PhD candidate at the University of California, Davis, who in 2015 began mapping and research on the Broxson Gulch and Valdez Creek fault systems bounding the northern edge of Wrangellia. Field notes, magnetic measurements, and rock samples were compiled and collected throughout the map area. Mappers recorded observations on 1:50,000- and 1:63,360-scale topographic base maps and compiled using ArcGIS software. Map interpretation relies on outcrop, subcrop, and float observations, and we use airborne magnetic and magnetic-electromagnetic surveys for interpolation between field stations. Location data were collected using handheld GPS units. Data sources used in this process:
    • Burns, L.E. and others, 2019
    Date: 2005 (process 2 of 4)
    Laboratory data compilation - Data sources used in this process:
    • Benowitz, J.A. and others, 2015
    • Benowitz, J.A. and others, 2017
    • Benowitz, J.A. and others, 2014
    • Holm-Denoma, C.S. and others, 2020
    • Naibert, T.J. and others, 2018
    • Todd, Erin and others, 2017
    • Twelker, Evan and others, 2014
    • Twelker, Evan and O'Sullivan, P.B., 2016
    • Wypych, Alicja and others, 2014
    • Wypych, Alicja and others, 2015
    Date: 2020 (process 3 of 4)
    Geologic map compilation - The conceptual framework for the regional geology incorporates key ideas from preexisting literature with new data and interpretations developed from field mapping and analytical findings. The accompanying map or report provides a comprehensive bibliographic reference list of prior work used to identify and delineate rock units and structural elements. The publication has received technical review and editing by several scientists familiar with the subject matter. The authors incorporated the reviewers' suggestions into the final draft.
    Date: 2022 (process 4 of 4)
    GIS analysis and digital cartography - This data distribution package's geologic and geographic features were organized and attributed according to the AK GeMS geologic mapping schema. The data were then programmatically transformed to provide download options in three formats: (1) an AK GeMS data package that includes the complete AK GeMS database and associated files, (2) a GeMS data package that is a conversion of the AK GeMS database into the base GeMS standard published by the USGS, and (3) a shapefile data package that includes two simple shapefile representations of the data. Data sources used in this process:
    • Ekberg, P.G. and others, 2021
    • Hendricks, M.D. and others, 2021
    • U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020
  3. What similar or related data should the user be aware of?
    Twelker, Evan, Hubbard, T.D., Wypych, Alicja, Sicard, K.R., Newberry, R.J., Reioux, D.A., Freeman, L.K., and Lande, L.L., 2015, Geologic map of the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska: Preliminary Interpretive Report PIR 2015-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 16 p., 1 sheet, scale 1:50,000

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    This data release provides geospatial data organized according to the GeMS and AK GeMS specifications. Attribute fields within each feature class are populated using corresponding applicable values from the GeMS and AK GeMS specifications. When known, certainty in attribute interpretation is indicated in the relevant fields. Attribute accuracy varies throughout the map and is scale-dependent.
  2. How accurate are the geographic locations?
    This data release provides geospatial data organized according to the GeMS and AK GeMS specifications. The data include descriptive fields within each feature class and accompanying orientation and location confidence lookup tables to record the originating authors' degree of confidence in the location of features. Certainty in feature boundaries or location varies throughout the map.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This publication is part of a DGGS Report of Investigations (RI). An RI is the completed product of original research and analysis, and RIs use professional cartography and undergo rigorous peer review, editing, and revision.
  5. How consistent are the relationships among the observations, including topology?
    All polygon features were topologically validated according to the AK GeMS geologic mapping schema specifications.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    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.
  2. What's the catalog number I need to order this data set? RI 2020-7
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 09-May-2022
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov
Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:
Generated by mp version 2.9.50 on Mon May 09 20:42:04 2022