Reconnaissance study of the Taylor Mountains pluton, southwestern Alaska

Hudson, T.L.Miller, M.L.Klimasauskas, E.P.Layer, P.W.2010Reconnaissance study of the Taylor Mountains pluton, southwestern AlaskageodatabaseProfessional PaperP 1776-AUnited StatesU.S. Geological Survey13 p.https://dggs.alaska.gov/pubs/id/24047Reconnaissance study of the Taylor Mountains pluton, southwestern Alaska, Professional Paper 1776-A, provides the results of geologic mapping and petrologic analysis of a 68-63 Ma epizonal, composite biotite-granite stock. The pluton consists of two compositionally similar porphyritic biotite-granite phases whose contrasting textures reflect differing emplacement histories. Fractional crystallization of these magmas produced a minor volume of fine-grained residual granite that, although distinctly more felsic, shows limited enrichment in trace elements or volatiles. Mineral deposits in the region are dominated by placer occurrences, likely sourced from vein systems in the surrounding country rocks rather than from hydrothermal activity associated with pluton crystallization. Geologic evidence indicates that the Taylor Mountains pluton formed through partial melting of continental crust in a high heat-flow environment during the waning stages of Late Cretaceous subduction beneath interior Alaska. This map was published by the USGS and has been scanned, digitized, and attributed by DGGS staff. The dataset provides geologic, structural, stratigraphic, and geochronologic information organized according to the GeMS and AK GeMS mapping schemas. The complete report, geodatabase, and ESRI fonts and style files are available from the Alaska Division of Geological & Geophysical Surveys website: https://dggs.alaska.gov/pubs/id/24047.This dataset provides a modern digital version of the original USGS geologic map of the Taylor Mountains area, enabling broader use of the information in current geologic, land-management, and resource-assessment workflows. By organizing the data into standardized GeMS and AK GeMS formats, it supports consistent interpretation of the region's geologic framework, mineral potential, and tectonic history. Making these data accessible in a GIS-ready form benefits Alaskans by improving the quality of information available for mineral exploration, infrastructure planning, environmental evaluation, and community decision-making.This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Macpherson, A.E., Athey, J.E., Wyatt, W.C., Montayne, Simone, Buchanan, Wes, Rivera, P.G., and Steinleitner, A.M., 2024, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170 v. 2, 13 p. https://doi.org/10.14509/31172. 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/10.14509/3058420052025ground conditionCompleteNone planned-157.494883-157.33894660.96737860.902996ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysBedrockDikeGeMS DB L3 CompliantGeMS DB v2GeochemistryGeochronologyGeologicGeologic MapGeologyGraniteHornfelsIgneousIntrusiveMetalsMineralsMiningPlutonicRocksSandstoneShaleSiltstoneAlaska Division of Geological & Geophysical SurveysAniak Mining DistrictSouthwest AlaskaStevens CreekTaylor MountainsWayne Taylor PeakWhitewater CreekAlaska Division of Geological & Geophysical SurveysKuskokwim GroupWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaCretaceousQuaternaryTertiaryThis 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).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.Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease 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.Amy E. Macpherson scanned and georeferenced the paper map to digitize geologic features into an AK GeMS database. Ally M. Steinleitner implemented final database quality control and packaging. This geologic map (or report or conversion or product, etc.) was funded by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G24AC00521, 2024, and the State of Alaska General Fund. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.Attribute fields within each feature class are populated using the map symbology and 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.All polygon features were topologically validated according to the AK GeMS geologic mapping schema specifications.This publication is a USGS Professional Paper(P), which is the premier series of the USGS. It consists of comprehensive reports of wide and lasting interest and scientific importance, characterized by thoroughness of study and breadth of scientific or geographic coverage.Certainty in feature boundaries or location varies throughout the map. Data fields within each feature class and the accompanying orientation and location confidence lookup tables record the authors' degree of confidence in the location of applicable features.Ekberg, P.G.Hendricks, M.D.Athey, J.E.2021AK GeMS symbology: A description of the AK GeMS style fileMiscellaneous PublicationMP 169Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys7 phttps://doi.org/10.14509/30584paper2021publication dateEkberg, P.G. and others, 2021GIS analysis and digital cartographyHendricks, M.D.Ekberg, P.G.Athey, J.E.Wyatt, W.C.Willingham, A.L.Naibert, T.J.2021AK GeMS data dictionary: A description of the Alaska geologic mapping schemaMiscellaneous PublicationMP 170Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys10 phttps://doi.org/10.14509/30669paper2021publication dateHendricks, M.D. and others, 2021GIS analysis and digital cartographyU.S. Geological Survey National Cooperative Geologic Mapping Program2020GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic mapsTechniques and MethodsTM 11-B10United StatesU.S. Geological Survey1 phttps://dggs.alaska.gov/pubs/id/30585paper2020publication dateU.S. Geological Survey National Cooperative Geologic Mapping Program, 2020GIS analysis and digital cartographyGeologic mapping - USGS geologists conducted field mapping of the Taylor Mountains area, documenting lithologic units, structural features, and intrusive relationships at detailed map scale. They recorded observations on aerial photographs and topographic bases, collected representative samples, and delineated geologic contacts and structural trends directly in the field. The team integrated field notes, sample data, and photogeologic interpretations to compile the original geologic map that forms the basis of this digital dataset.2005Geologic map conversion - DGGS staff scanned the original USGS paper map at high resolution, georeferenced it to modern coordinate standards, and digitized geologic contacts, structures, and map-unit polygons. They attributed all features following GeMS and AK GeMS schemas and completed quality-control checks for accuracy and schema compliance.2025Data packaging - DGGS organized and attributed the geologic and geographic features according to the AK GeMS schema, then programmatically transformed the data into four distribution formats: (1) an AK GeMS data package containing the full database and supporting files, (2) a GeMS data package converted to the USGS base standard, (3) a SQLite database file, and (4) a simplified shapefile package with shapefile representations of the data.2025vectorAlaska Albers55.065.0-154.050.000coordinate pair0.00000000305360181585001630.0000000030536018158500163metersNAD83GRS 806378137298.257222101taylor_mountains_pluton_ak_gems_dbGeodatabase, layer files, style files, and fontsDGGStaylor_mountains_pluton_ak_gems_dbtaylor_mountains_pluton_gems_dbGeodatabase, layer files, style files, and fontsDGGStaylor_mountains_pluton_gems_dbtaylor_mountains_pluton_gems_geopackageSQLite Database fileDGGStaylor_mountains_pluton_gems_geopackagetaylor_mountains_pluton_gems_shapefileShapefiles and open data filesDGGStaylor_mountains_pluton_gems_shapefileAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If 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.https://dggs.alaska.gov/metadata/dggs.extdggs metadata extensions