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    Geologic Map of the Twin Buttes 7.5' Quadrangle, Pima County, Arizona, v. 2.0

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    Name:
    ncgmp09.zip
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    application/zip
    Description:
    GeMS v1.1 Geodatabase
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    Description:
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    TwinButtes.zip
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    1.363Mb
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    Description:
    Open-Source version of gisdata
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    Author
    Richard, S.M.
    Spencer, J.E.
    Youberg, A.
    Johnson, B.J.
    Issue Date
    2019
    Keywords
    Arizona Geological Survey Digital Geologic Maps
    Anaconda
    Twin Buttes mine
    Pima mine
    Twin Buttes
    Arizona
    Pima County
    Sierrita Mountains
    Esperanza mine
    Sierrita mine
    surficial geology
    bedrock geology
    digital geologic map
    digital cartography
    Proterozoic
    Cambrian
    Devonian
    Pennsylvanian
    Permian
    Paleozoic
    Mesozoic
    Late Cretaceous
    Laramide orogeny
    Tertiary
    Late Paleocene
    Oligocene
    Miocene
    Pleistocene
    Quaternary
    Green Valley
    Basin and Range Province
    Martin Formation
    Horquilla Formation
    sandstone
    granitoid
    granodiorite
    mine tailings
    piedmont
    silicified rock
    Upper Bolsa Formation
    Escabrosa Limestone
    karst
    Earp Formation
    dolomite
    hydrothermally altered rock
    Concha Marble
    Mission Mine Complex
    Rodolfo Formation
    welded tuff
    volcanics
    arkose
    Whitcomb Quartzite
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    Metadata
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    Citation
    Richard, S.M., Spencer, J.E., Youberg, A., and Johnson, B.J., 2019, Geologic Map of the Twin Buttes 7.5' Quadrangle, Pima County, Arizona: Arizona Geological Survey Digital Geologic Map DGM-31, version 1.1, map scale 1:24,000.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    This geologic map of the Twin Buttes 7.5' quadrangle, located south of Tucson in southern Arizona, includes both bedrock and surficial mapping. The map shows the 2120 level in the Twin Buttes mine, along with geology mapped by Anaconda geologists that are now buried beneath rock heaps around the mine. Access to the now inactive Twin Buttes mine was not obtained during the current mapping effort. The most prominent feature of Paleozoic and Mesozoic units in the Twin Buttes area is the northwest-trending alignment of lithologic contacts. In outcrops on Twin Buttes and hills to the west, layering in marbles and rare relict bedding in clastic units are sub parallel to this trend except for local irregularities. A northwest-trending fault, parallel to the trend of lithologic units, is intruded by Ruby Star Granodiorite east of Twin Buttes (UTM 494300N, 3531000E). In the Twin Buttes level 2120 map, a short segment of a northwest-trending fault separates Horquilla Limestone from Proterozoic granite. A third significant, northwest-trending fault is inferred within the porphyry intrusion in the Twin Buttes mine, south of the Twin Buttes fault. The stratigraphically highest unit intruded by the porphyry southwest of the fault is the Concha Limestone, but on the northeast side of the intrusion, Earp and possible Horquilla formation are intruded. These relations require that the intrusion is inserted along a fault. In all three cases, the northwest-trending faults have younger rocks to the southwest and older rocks to the northeast. One 1:24,000 scale map sheet with cross-section.
    URI
    http://hdl.handle.net/10150/630964
    Additional Links
    https://library.azgs.arizona.edu/item/ADGM-1674163023295-517
    Language
    en
    Series/Report no.
    DGM-31
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    32
    South Bounding Coordinate
    31.875
    West Bounding Coordinate
    -111.125
    East Bounding Coordinate
    -111
    Collections
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