Interpretive geologic bedrock map of the Tanana B-1 Quadrangle, central Alaska

Reifenstuhl, R.R.Dover, J.H.Newberry, R.J.Clautice, K.H.Liss, S.A.Blodgett, R.B.Bundtzen, T.K.Weber, F.R.1997Interpretive geologic bedrock map of the Tanana B-1 Quadrangle, central AlaskageodatabaseReport of InvestigationRI 97-15BFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys15 p., 1 sheet, scale 1:63,360https://doi.org/10.14509/2552Report of Investigation 97-15B, Interpretive geologic bedrock map of the Tanana B-1 Quadrangle, central Alaska, provides detailed (1:63,360-scale) surficial geologic mapping of the Tanana B-1 Quadrangle (250 square miles; equivalent to four 7.5 minute quadrangles). The area is part of the Manley Hot Springs-Tofty mining districts and adjacent to the Rampart mining district north of the Tanana A-1 and A-2 quadrangles. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2552.The Tanana B-1 Quadrangle lies between the villages of Rampart, on the Yukon River, and Manley Hot Springs, at the terminus of the Elliot Highway. When this project was published, the area towns were not part of any municipal or local governmental jurisdiction. The investigation of gold, tin, and other mineral occurrences in conjunction with comprehensive geologic mapping and recently acquired geophysical data will provide a scientific basis for continued mineral exploitation that will economically benefit the region's inhabitants and the State of Alaska.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/10.14509/305841996ground conditioncompleteNone planned-150.524050-149.97139665.50914465.240961ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAge DatesAmphiboliteAnalyses and SamplingBasaltBedrockBedrock Geologic MapBedrock GeologyCarbonatesChertClasticsCoalConglomerateDioriteDomeFelsicFoldingGeMSGeMS NCGMP09GeochemistryGeochronologyGeologicGeologic MapGeologyGeomorphologyGeothermometryGraniteGraywackeGreenschistGreenstoneHornfelsIgneousIgneous RocksIndex MineralsIsogradsIsotopesK-ArLimestoneLodeMarbleMetalsMetamorphic GradeMetamorphic MineralsMetamorphismMountainPebblePegmatitePetrographyPlutonicPlutonic HostedPrecious MetalsQuartzQuartziteRegionalRegional MetamorphismResource AssessmentResourcesRhyoliteRiftingRocksSTATEMAP ProjectSample LocationSandstoneSchistSedimentaryShaleSiltstoneStructureSurficialTectonicsTerranesTuffVolcanicAlaska Division of Geological & Geophysical SurveysAloha CreekBaldry MountainBoulder CreekCalifornia CreekChapman CreekChicken CreekElephant MountainFlorida CreekGarnet CreekGoldpan CreekGranite CreekHoosier CreekHot Springs Mining DistrictHunter CreekJordan CreekJoseph CreekLivengoodLost CreekMarshall CreekMiller CreekMinook CreekNevada CreekRampartRampart CreekRampart Mining DistrictRock CreekRuby CreekRussian CreekSixmile CreekSlate CreekSpruce CreekTriple CreekTrout CreekYukon RiverYukon-Tanana UplandAlaska Division of Geological & Geophysical SurveysAmy Creek AssemblageLivengood Dome ChertRampart GroupRuby TerraneWickersham UnitYukon-Tanana TerraneWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaCambrianCretaceousDevonianEarly CretaceousEarly EoceneEarly PermianJurassicMississippianOrdovicianPaleocenePermianProterozoicTertiaryTriassicThis 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.Funding for the geologic mapping for this project was provided by the U.S. Geological Survey STATEMAP Program under award number 147-HQ-96AG and by the Alaska State Legislature. Geologic map conversion to the GeMS standard was funded by the USGS National Cooperative Geologic Mapping Program under StateMap award number G20AC00367, 2020, 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.Reifenstuhl, R.R.Dover, J.H.Pinney, D.S.Newberry, R.J.Clautice, K.H.Liss, S.A.Blodgett, R.B.Bundtzen, T.K.Weber, F.R.1997Geologic map of the Tanana B-1 Quadrangle, central AlaskaReport of InvestigationRI 97-15AFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys17 p., 1 sheet, scale 1:63,360https://doi.org/10.14509/2551Pinney, D.S.1997Derivative geologic materials map of the Tanana B-1 Quadrangle, central AlaskaReport of InvestigationRI 97-15DFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2554Pinney, D.S.1997Surficial geologic map of the Tanana B-1 Quadrangle, central AlaskaReport of InvestigationRI 97-15CFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 p., 1 sheet, scale 1:63,360https://doi.org/10.14509/2553This data release provides legacy geospatial data converted 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.All polygon features were topologically validated according to specifications of the AK GeMS geologic mapping schema.This publication is 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 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. When location accuracy values are unavailable, users must infer positional accuracy based on standard geologic mapping practices of the investigation era. Field stations were located using hand-held GPS units, however for fieldwork conducted before 2000, Selective Availability limited location accuracy of the coordinates to roughly 100 meters. Certainty in feature boundaries or location varies throughout the map.Burns, L.E.Graham, G.R.C.Barefoot, J.D.Woods, Rebecca-EllenDighemPritchard, R.A.WGM, Inc.Stevens Exploration Management Corp.Fugro Airborne Surveys Corp.2020Rampart-Manley electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2020-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys13 phttps://doi.org/10.14509/30417paper2020publication dateBurns, L.E. and others, 2020Geologic map compilationEkberg, 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 cartographyLiss, S.A.Reifenstuhl, R.R.Clautice, K.H.Bundtzen, T.K.Newberry, R.J.Dover, J.H.Blodgett, R.B.1997Rock geochemistry from the Rampart mining districtPublic Data FilePDF 97-29GFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys19 p., 1 DVDhttps://doi.org/10.14509/1778paper1997publication dateLiss, S.A. and others, 1997Geologic map compilationNewberry, R.J.Haug, S.A.1997CIPW Norm, trace element, and Sr isotopic data for igneous rocks of the Tanana B-1 Quadrangle and vicinityPublic Data FilePDF 97-29IFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys16 phttps://doi.org/10.14509/1780paper1997publication dateNewberry, R.J. and Haug, S.A., 1997Geologic map compilationReifenstuhl, R.R.Layer, P.W.Newberry, R.J.1997Geochronology (40Ar/39Ar) of 17 Rampart area rocks, Tanana and Livengood quadrangles, central AlaskaPublic Data FilePDF 97-29HFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys22 phttps://doi.org/10.14509/1779paper1997publication dateReifenstuhl, R.R. and others, 1997Geologic map compilationReifenstuhl, R.R.Newberry, R.J.Haug, S.A.Clautice, K.H.Liss, S.A.Weber, F.R.2009Chert geochemistry discriminant analysis and K-means cluster analysis: Rampart project area, Tanana B-1 Quadrangle, east-central AlaskaReport of InvestigationRI 2009-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys16 phttps://doi.org/10.14509/19341paper2009publication dateReifenstuhl, R.R. and others, 2009Geologic map compilationBedrock geologic mapping - Field work for bedrock investigations, including ridge traverses and examination of riverbank exposures, was conducted between April 30 and July 4, 1996. Field notes and rock samples were collected at approximately 700 stations throughout the Tanana A-1 and A-2 Quadrangles. Bedrock mappers recorded observations on 1:50,000- and 1:63,360-scale topographic base maps, compiled onto a 1:50,000-mylar map after the field season ended. Airborne geophysics for the Tanana B-1 Quadrangle and surrounding area was highly influential in the lithologic and structural mapping, especially in areas of poor exposure. Field stations were located using hand-held GPS units.1996Laboratory data compilation - Selected samples were submitted for geochronologic and geochemical analysis. The results were used to further interpret the stratigraphic and structural history of the map area.1998Geologic map compilation - The geologic data were digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Contacts and other geologic features were determined visually using topographic maps at scales of 1:63,360 and 1:25,000, field station notes, and GPS location data. Geologic features were visually hand-plotted onto stable mylar bases from the field maps and then digitally compiled and plotted using ArcInfo software. The map and report received technical review and editing by several scientists familiar with the subject matter. When deemed appropriate, the authors incorporated the reviewers' suggestions into the final draft.Burns, L.E. and others, 2020Liss, S.A. and others, 1997Newberry, R.J. and Haug, S.A., 1997Reifenstuhl, R.R. and others, 1997Reifenstuhl, R.R. and others, 20091998GIS 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.Ekberg, P.G. and others, 2021Hendricks, M.D. and others, 20212021vectorUniversal Transverse Mercator50.999600-1530500000.0000000coordinate pair.00000001.00000001MetersNAD27Clarke 18666378206.40000000037294.978698199999997tanana_b1_quad_bedrock_ak_gems_db_pkgGeodatabase, layer files, style files, and fontsAlaska Division of Geological & Geophysical Surveystanana_b1_quad_bedrock_ak_gems_db_pkgtanana_b1_quad_bedrock_gems_db_pkgGeodatabase, layer files, style files, and fontsAlaska Division of Geological & Geophysical Surveystanana_b1_quad_bedrock_gems_db_pkgtanana_b1_quad_bedrock_gems_shapefile_pkgShapefiles and open data filesAlaska Division of Geological & Geophysical Surveystanana_b1_quad_bedrock_gems_shapefile_pkgAlaska 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