geochron-detail: Geochronology lab files and applicable documentation. geochron-summary: Identification numbers, coordinates, sample descriptions, and summary ages of each sample.
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:
This is a point data set.
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in decimal degrees.
The horizontal datum used is World Geodetic System of 1984.
The ellipsoid used is WGS 84.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257223563000025.
Processing of the isotopic analyses in this report was funded through a cooperative partnership between the U.S. Geological Survey and the Alaska Division of Geological & Geophysical Surveys. The Styx mineral assessment project was conducted under the Alaska Airborne Geophysical/Geological Mineral Inventory Program (AGGMI), funded by the Alaska State Legislature and managed by DGGS. The Talkeetna Mountains project was jointly funded by the State of Alaska's Strategic and Critical Minerals Assessment program (part of AGGMI) and the USGS National Cooperative Geologic Mapping Program, STATEMAP component, under award number G14AC00167 for 2014. We thank Jamey Jones (USGS Anchorage) and Chris Holm-Denoma (USGS Denver) for their suggestions and edits. 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.
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This Lu-Hf and U-Pb isotopic study was implemented to better understand the Jurassic through early Tertiary magmatic and tectonic evolution of the Alaska Range and the significance of that magmatism for the formation of metallic mineral deposits. The U-Pb isotopic data also serve to further refine the crystallization age of plutons, which were previously ambiguous in 40Ar/39Ar geochronology studies. Samples were collected in conjunction with the 2013 Styx River and 2014 Talkeetna Mountains geologic mapping and mineral resource evaluation projects.
Benowitz, J.A., Layer, P.W., and Sicard, K.R., 2014, 40Ar/39Ar data, Styx River map area, Lime Hills C-1 Quadrangle, Alaska: Raw Data File RDF 2014-21 v. 1.0.1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
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:
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:
Lande, Lauren, Newberry, R.J., and Twelker, Evan, 2015, A petrological model for emplacement of the ultramafic Ni-Cu-PGE Alpha complex, Eastern Interior, Alaska (poster): Geological Society of America Cordilleran Section - 111th Annual Meeting, Anchorage, Alaska, May 11-13, 2015: Poster and Presentation Lande, Lauren and others, 2015, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Sicard, K.R., Twelker, Evan, Freeman, L.K., Bachmann, E.N., Reioux, D.A., Tuzzolino, A.L., Wright, T.C., Newberry, R.J., Burns, L.E., and Werdon, M.B., 2013, Geologic mapping in the Styx River area, Lime Hills C-1 Quadrangle, western Alaska Range (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 4-10, 2013: Poster and Presentation Sicard, K.R. and others, 2013, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Sicard, K.R., Twelker, Evan, Freeman, L.K., Wypych, Alicja, Newberry, R.J., Benowitz, J.A., and Kass, M.A., 2014, Cretaceous to Tertiary magmatism and associated mineralization in the Lime Hills C-1 Quadrangle, western Alaska Range (presentation): Alaska Miners Association Annual Conference, November 3-9, 2014, Anchorage, Alaska: Poster and Presentation Sicard, K.R. and others, 2014, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Sicard, K.R., Wypych, Alicja, Twelker, Evan, Bachmann, E.N., Freeman, L.K., Newberry, R.J., Reioux, D.A., Tuzzolino, A.L., and Wright, T.C., 2014, Major-oxide, minor-oxide, and trace-element geochemical data from rocks in the Styx River area, Lime Hills C-1 Quadrangle, Lime Hills, McGrath, Talkeetna, and Tyonek quadrangles, Alaska: Raw Data File RDF 2014-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Sicard, K.R., Wypych, Alicja, Twelker, Evan, Freeman, L.K., Bachmann, E.N., Reioux, D.A., Tuzzolino, A.L., and Wright, T.C., 2014, Geochemistry and petrology of igneous rocks from the Styx River map area (presentation): Alaska Miners Association 24th Biennial Mining Conference, April 7-14, 2014, Fairbanks, Alaska: Poster and Presentation Sicard, K.R. and others, 2014, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Twelker, Evan, and Burns, L.E., 2014, New geochemical and geophysical data from the western Wrangellia minerals assessment area (presentation): Alaska Miners Association 24th Biennial Mining Conference, Fairbanks, Alaska April 7-13, 2014: Poster and Presentation Twelker, Evan and Burns, L.E., 2014, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Twelker, Evan, and Lande, Lauren, 2015, DGGS geological investigations in western Wrangellia (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 1-5, 2015: Poster and Presentation Twelker, Evan and Lande, Lauren, 2015, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
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:
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:
Twelker, Evan, Newberry, R.J., Freeman, L.K., Sicard, K.R., Reioux, D.A., and Bachmann, E.N., 2013, DGGS geologic and mineral-resource assessment of the western Wrangellia terrane, central Alaska: Initial progress report (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 4-10, 2013: Poster and Presentation Twelker, Evan and others, 2013, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Twelker, Evan, Wypych, Alicja, and Newberry, R.J., 2014, New data and insight on the Late Triassic Wrangellia magmatic Ni-Cu-Co-PGE system in the Talkeetna Mountains, central Alaska (poster): Society of Economic Geologists 2014 Conference, September 27-30, 2014: Poster and Presentation Twelker, Evan and others, 2014, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Twelker, Evan, Wypych, Alicja, Sicard, K.R., Newberry, R.J., Freeman, L.K., Reioux, D.A., and Lande, Lauren, 2014, Preliminary results from 2014 geologic mapping in the Talkeetna Mountains, Alaska (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 3-9, 2014: Poster and Presentation Twelker, Evan and others, 2014, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
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:
This data set is being released in the DGGS Raw Data File series. The information has been examined by several geologists familiar with the study area, but the data and accompanying report have not been formally reviewed for technical content or for conformity to the editorial standards of DGGS. Questions regarding the accuracy of information in the data files can be best answered by the originating lab.
Sample location coordinates (WGS84 datum) were obtained using handheld Trimble Juno T5 GPS units, which have a typical reported accuracy of about 10 m.
This data release is complete.
not applicable
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RDF 2017-2
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| Data format: | ASCII tabular files |
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| Network links: |
<http://doi.org/10.14509/29717> |
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