15612cb6-cf19-4b44-bf5d-01008635ef7e_source eng; USA utf8 dataset Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact 2022-01-15 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Northeast Tanacross geologic map and map units and descriptions 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher 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. originator https://doi.org/10.14509/30539 GEODATABASE Report of Investigation RI 2020-9B p. 9-26, 1 sheet, scale 1:63,360 Report of Investigation 2020-9B, Northeast Tanacross geologic map and map units and descriptions, provides 500 square miles of 1:63,360-scale geologic mapping in the northeastern Tanacross Quadrangle (Tanacross D-1, and parts of the C-1, C-2, and D-2 quadrangles), located 15 miles southeast of Chicken, Alaska. The project took place during two periods: a reconnaissance mapping effort June 12-22, 2017, and a detailed campaign June 18-July 16, 2018. The map area covers the boundary between the allochthonous Yukon-Tanana terrane (YTT) and the parautochthonous North American margin (pNA) from which the YTT initially rifted. This suture zone has a complex, multiphase structural and metamorphic history, and the northeastern Tanacross Quadrangle is one of the rare areas in which it is exposed. The conceptual framework has been developed in the literature, but it is not fully represented in previously published geologic maps of eastern Alaska. This map encompasses an area of current mineral industry interest; it includes the Taurus porphyry copper-gold-molybdenum +/- rhenium deposit and several other occurrence types, including gold, copper, and molybdenum in porphyritic intrusions, structurally controlled silver-lead-zinc prospects, and placer gold deposits. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/30539. Resurgent mineral industry interest in the East central Alaska region prompted DGGS to conduct new 1:63,360-scale geologic mapping in the northeastern Tanacross Quadrangle. We would like to thank James V. Jones III (USGS, Anchorage) and Robert Gillis (DGGS) for thorough and constructive reviews of the geologic map, map unit descriptions, and report. The DGGS Northeast Tanacross project was funded by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G18AC00137 for 2018 and by State of Alaska general funds. 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. completed Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. pointOfContact notPlanned Aerial Aerial Photography Alluvial Alluvial Deposits Amphibolite Amphibolite Facies Units Bedrock Geology Colluvial Deposits Complex Deposits GeMS Geologic Geologic Map Geologic Mapping Standards Gis Glacial Deposits Igneous Igneous Rocks Metamorphic Metamorphic Rocks Metasedimentary Rocks Orthogneiss Quartzite Remote Sensing Schist Sedimentary Sedimentary Rocks Surficial Surficial Geology theme Alaska Division of Geological & Geophysical Surveys Bedrock Creek Big Timber Creek Cherry Creek Crow Creek Dewey Creek Divide Mountain Dude Creek Fishhook Bend Fortymile Mining District Gold Bar Creek Liberty Creek McCord Creek McElfish Creek McKinley Creek Prindle Volcano Sixtymile River Tom Paine Creek place Alaska Division of Geological & Geophysical Surveys Klondike Assemblage Lake George Assemblage Nasina Assemblage stratum Alaska Division of Geological & Geophysical Surveys Cretaceous Devonian Late Cretaceous Late Triassic Mississippian Paleozoic Permian Quaternary Triassic temporal 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 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. otherRestrictions 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. otherRestrictions 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). Northeast Tanacross geologic mapping project, Alaska 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Wypych, Alicja originator https://doi.org/10.14509/30537 Report of Investigation RI 2020-9 75 p crossReference vector eng; USA geoscientificInformation -141.653213 -141.000000 63.612549 64.001478 2017-01-01 2018-01-01 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 true geodatabase unknown Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. distributor Contact DGGS for current pricing Free download https://doi.org/10.14509/30539 geodatabase CSDGM IMPORT ERROR: No digtinfo/formcont information dataset Horizontal Positional Accuracy Report This data release provides legacy geospatial data converted to the GeMS and AK GeMS specifications. To record the originating authors' degree of confidence in the location of features, the data include descriptive fields within each feature class and accompanying orientation and location confidence lookup tables. Certainty in feature boundaries or location varies throughout the map. 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. 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. All polygon features were topologically validated according to specifications of the AK GeMS geologic mapping schema. This lineage was generated by the FGDC CSDGM to 19139 transformation Quaternary unconsolidated deposits - This map includes unconsolidated surficial deposits in the Tanacross D-1 Quadrangle, the eastern one-third of the Tanacross D-2 Quadrangle, the northern half of the Tanacross B-2 Quadrangle, and the northeastern one-third of the Tanacross B-2 Quadrangle. To create this map we incorporated (1) geologic information from previous geologic mapping and published literature, (2) new interpretations using remotely sensed imagery, and (3) information gathered from limited field investigations. Previous geologic mapping of the unconsolidated deposits in the Tanacross Quadrangle includes work by Foster (1970) at a scale of 1:250,000, which provided a framework for our mapping and was instrumental in understanding the regional distribution and character of Quaternary deposits. Weber (1986) described the glacial history of the Yukon Tanana Upland and gave detailed descriptions of the extent and character of these deposits. Her work, along with glacial limits mapped by Péwé and others (1967) helped us identify and map glacial deposits in the map area. Work by Pinney (2001) and Stevens and Burns (2010) in the Eagle A-1 and A-2 quadrangles enabled us to understand the distribution and character of deposits in adjoining areas to the north and enhanced our understanding of the morphology and distribution of alluvial terraces, many of which are gold-bearing and extend southward into this map area. Mapping at a scale of 1:50,000 in the adjoining Borden Creek and Crag Mountain quadrangles by Jackson (2005a, 2005b) allowed comparisons with the distribution and character of deposits in Canada. A complete reference list is available in the accompanying report. 2018-01-01T00:00:00 Remotely sensed imagery - Surficial geology was mapped by interpreting 2.5-m-resolution SPOT 5 color-infrared and natural color red-green-blue (RGB) imagery (©2013, Distribution SpotImage S.A., SICORP, USA, all rights reserved) collected in 2009 and 2010 and stereoscopic pairs of approximately 1:65,000-scale, false-color, infrared aerial photographs taken in 1978 and 1981. SPOT 5 imagery was interpreted in ArcGIS Pro by overlaying it on hillshade and slopeshade images derived from Interferometric Synthetic Aperture Radar (IFSAR) bare-earth digital-elevation models (DEMs) created using data collected in 2010. By using the pseudo-3-D functionality of ArcGIS Pro and adjusting the transparency of the SPOT 5 imagery and the transparency and color of hillshade and slopeshade images, we were able to visualize subtle differences in features and identify geologic landforms. We used aerial photographs to identify geologic features and check our interpretations. Geospatial polygon features that represent geologic units were drawn using onscreen digitizing techniques in ArcGIS Pro. 2018-01-01T00:00:00 Geologic mapping - Fieldwork for bedrock investigations, including ridge traverses and examination of riverbank exposures, took place during two periods: a reconnaissance mapping effort June 12-22, 2017, and a detailed campaign June 18-July 16, 2018. 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. Location data were collected using GPS-enabled tablets (2017 Samsung Galaxy Tab A) running the ESRI Collector App. 2018-01-01T00:00:00 Laboratory data compilation - Selected samples were submitted for geochemical and geochronologic analysis. The results were used to further interpret rock units and the stratigraphic and structural history of the map area. 2018-01-01T00:00:00 Geologic map compilation - The conceptual framework for the regional geology relies heavily on preexisting literature. The map area is heavily vegitated; consequently, the map interpretation relies heavily on geochemical and geochronological findings, magnetic and electromagnetic survey data, and observations from rocks collected from pits dug into rocky colluvial deposits below surficial loess or sand. A comprehensive bibliographic reference list of prior work used to identify and delineate rock units and structural elements is provided in the accompanying report. The map and report received technical review and editing by several scientists familiar with the subject matter. The authors incorporated the reviewers' suggestions into the final draft when deemed appropriate. 2020-01-01T00:00:00 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. 2021-01-01T00:00:00 Source Contribution: Geologic map compilationSource Type: paper Geochronology of augen gneiss and related rocks, Yukon-Tanana terrane, east-central Alaska 1986-01-01 publication Geological Society of America Unknown publisher Aleinikoff, J.N. originator Dusel-Bacon, Cynthia originator Foster, H.L. originator http://gsabulletin.gsapubs.org/content/97/5/626.abstract Bulletin v. 97, no. 5 1986-01-01 Source Contribution: Geologic map compilationSource Type: paper 63360 Ladue survey area: Magnetic and electromagnetic line, grid, and vector data and Maps, Fortymile mining district, Tanacross Quadrangle, eastern Alaska 2011-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Fugro Airborne Surveys Corp. originator Fugro GeoServices, Inc. originator https://doi.org/10.14509/22562 Geophysical Report GPR 2011-1 26 sheets, scale 1:63,360, 1 DVD 2011-01-01 Source Contribution: Geologic map compilationSource Type: paper Fortymile mining district electromagnetic and magnetic airborne geophysical survey data compilation 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator Emond, A.M. originator Graham, G.R.C. originator https://doi.org/10.14509/29411 Geophysical Report GPR 2015-4 12 p 2015-01-01 Source Contribution: Geologic map compilationSource Type: paper Paleozoic tectonic and metallogenic evolution of the pericratonic rocks of east-central Alaska and adjacent Yukon 2006-01-01 publication Geological Association of Canada Unknown publisher Dusel-Bacon, Cynthia originator Hopkins, M.J. originator Mortensen, J.K. originator Dashevsky, S.S. originator Bressler, J.R. originator Day, W.C. originator null Special Paper 45 2006-01-01 Source Contribution: Geologic map compilationSource Type: paper U-Pb zircon and titanite ages for augen gneiss from the Divide Mountain area, eastern Yukon-Tanana Upland, Alaska, and evidence for the composite nature of the Fiftymile Batholith 1996-01-01 publication U.S. Geological Survey United States publisher Dusel-Bacon, Cynthia originator Aleinikoff, J.N. originator https://dggs.alaska.gov/pubs/id/4323 Bulletin B 2152 p. 131-141 1996-01-01 Source Contribution: GIS analysis and digital cartographySource Type: paper AK GeMS symbology: A description of the AK GeMS style file 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Ekberg, P.G. originator Hendricks, M.D. originator Athey, J.E. originator https://doi.org/10.14509/30584 Miscellaneous Publication MP 169 7 p 2021-01-01 Source Contribution: Geologic map compilationSource Type: paper Tok electromagnetic and magnetic airborne geophysical survey data compilation 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator CGG originator Burns, L.E. originator Graham, G.R.C. originator CGG Land (US) Inc. originator https://doi.org/10.14509/29347 Geophysical Report GPR 2015-2 13 p 2015-01-01 Source Contribution: Geologic map compilationSource Type: paper Geology of the Boundary area, Eagle A-1 and Tanacross D-1 quadrangles, east-central Alaska 2003-01-01 publication University of Alaska Fairbanks Fairbanks Alaska publisher Flynn, R.L. originator null 2003-01-01 Source Contribution: Geologic map compilationSource Type: paper Geology and mineral deposits of the southwest quarter of the Tanacross D-1 Quadrangle, Alaska 1977-01-01 publication Western Washington University Bellingham Washington publisher Gill, R.D. originator null 1977-01-01 Source Contribution: GIS analysis and digital cartographySource Type: paper AK GeMS data dictionary: A description of the Alaska geologic mapping schema 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Hendricks, M.D. originator Ekberg, P.G. originator Athey, J.E. originator Wyatt, W.C. originator Willingham, A.L. originator Naibert, T.J. originator https://doi.org/10.14509/30669 Miscellaneous Publication MP 170 10 p 2021-01-01 Source Contribution: Geologic map compilationSource Type: paper 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 2018-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Naibert, T.J. originator Benowitz, J.A. originator Wypych, Alicja originator Sicard, K.R. originator Twelker, Evan originator https://doi.org/10.14509/30112 Raw Data File RDF 2018-3 15 p 2018-01-01 Source Contribution: Geologic map compilationSource Type: paper 63360 Bedrock geologic map of the Eagle A-1 Quadrangle, Fortymile mining district 2002-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Szumigala, D.J. originator Newberry, R.J. originator Werdon, M.B. originator Athey, J.E. originator Flynn, R.L. originator Clautice, K.H. originator https://doi.org/10.14509/2864 Preliminary Interpretive Report PIR 2002-1B 1 sheet, scale 1:63,360 2002-01-01 Source Contribution: Geologic map compilationSource Type: paper 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 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Todd, Erin originator Wypych, Alicja originator Kylander-Clark, Andrew originator https://doi.org/10.14509/30198 Raw Data File RDF 2019-5 10 p 2019-01-01 Source Contribution: Geologic map compilationSource Type: paper 63360 Bedrock geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska 2001-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Werdon, M.B. originator Newberry, R.J. originator Szumigala, D.J. originator https://doi.org/10.14509/2670 Preliminary Interpretive Report PIR 2001-3B 1 sheet, scale 1:63,360 2001-01-01 Source Contribution: Geologic map compilationSource Type: paper 63360 Northeastern Tanacross geologic map, Tanacross D-1, D-2, C-1, and C-2 quadrangles, Alaska 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher 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. originator https://doi.org/10.14509/30197 Preliminary Interpretive Report PIR 2019-6 20 p., 1 sheet, scale 1:63,360 2019-01-01 Source Contribution: GIS analysis and digital cartographySource Type: paper GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps 2020-01-01 publication U.S. Geological Survey United States publisher U.S. Geological Survey National Cooperative Geologic Mapping Program originator https://dggs.alaska.gov/pubs/id/30585 Techniques and Methods TM 11-B10 1 p 2020-01-01 otherRestrictions 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. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact