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    Geologic Map of the Tortolita Mountains, Pinal and Pima Counties, Arizona, v. 1.0

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    Author
    Ferguson, C.A.
    Johnson, B.J.
    Skotnicki, S.J.
    Maher, D.J.
    Spencer, J.E.
    Gilbert, W.G.
    Richard, S.M.
    Youberg, A.
    Demsey, K.A.
    House, P.K.
    Issue Date
    2002
    Keywords
    Arizona Geological Survey Digital Geologic Maps
    Catalina detachment fault
    Rincon
    Santa Catalina Mountains
    Catalina metamorphic core complex
    Ruelas Canyon
    Desert Peak
    marana
    Tortolita Mountains
    Pima County
    Pinal County
    Spring Quartzi
    piedmont deposits
    plutonic
    Metamorphic
    Paleoproterozoic
    Paleozoic
    Oligocene
    Tertiary
    Proterozoic
    Quaternary
    Pleistocene
    Holocene
    Chirreon Wash
    Fresnal Canyon
    Wild Burro Canyon
    Owl Head Buttes
    plutons
    granitoids
    volcanics
    Oracle Granite
    tuff
    conglomerate
    talus
    mine dumps
    ductile deformation
    Guild Wash fault
    Carpas Wash shear zone
    hanging wall geometry
    thermochronology
    metamorphic core complex
    detachment fault
    Pinal Schist
    Dripping Spring Quartzite
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    Citation
    Ferguson, C.A., Johnson, B.J., Skotnicki, S.J., Maher, D.J., Spencer, J.E., Gilbert, W.G., Richard, S.M., Youberg, A., Demsey, K.A., and House, P.K., 2002, Geologic Map of the Tortolita Mountains, Pinal and Pima Counties, Arizona: Arizona Geological Survey Digital Geologic Map DGM-26, version 1.0, map scale 1:24,000, 46 p., 2 map sheets and metadata.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    The geologic map of the Tortolita Mountains encompasses the Tortolita Mountains 7.5’ quadrangle plus parts of 3 adjoining 7.5’ quadrangles; Desert Peak and Marana to the west and southwest, and Ruelas Canyon to the south. The Tortolita Mountains mark the northwestern extent of the Catalina metamorphic core complex (Davis, 1980; Banks, 1980; Keith et al., 1980; Dickinson, 1991; Force, 1997). Metamorphic and plutonic rocks of the complex were exhumed along a low-angle detachment fault of Mid-Tertiary age that is exposed along the southern edge of the Rincon and Santa Catalina Mountains and is inferred to lie buried beneath piedmont deposits along the southern edge of the Tortolita Mountains. A single small exposure of Middle Proterozoic Dripping Spring Quartzite on the southern piedmont of the Tortolita Mountains is interpreted to lie in the hanging wall of the Catalina detachment fault. This study documents a ductile shear zone in the northern part of the range, herein named the Carpas Wash shear zone, and a system of brittle normal faults that are interpreted as the northern continuation of the Catalina detachment fault system. Other important conclusions based on our mapping include: 1) recognition of a major, east-dipping normal fault bounding the western edge of a west-tilted sequence of volcanic rocks at Owl Head Buttes, 2) reinterpretation of a sequence of metasedimentary rocks near the head of Parker Canyon as Paleoproterozoic Pinal Schist instead of Mesoproterozoic Apache Group, 3) recognition of a north-dipping, top-tothe- west low-angle normal fault with an exceptionally wide and well-developed chloritic breccia ledge in its footwall along the western edge, 4) reinterpretation of the Cochie Canyon shear zone as a septum of Pinal Schist separating two major plutonic complexes, and 5) reinterpretation of a part of an easterly strand of the Guild Wash fault zone as a series of south-dipping reverse faults that cut the lower part of the Tertiary supracrustal stratigraphic sequence and that are overlain by Tertiary conglomeratic units.
    URI
    http://hdl.handle.net/10150/630962
    Additional Links
    http://repository.azgs.az.gov/uri_gin/azgs/dlio/496
    Language
    en
    Series/Report no.
    DGM-26
    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
    32.626
    South Bounding Coordinate
    32.435
    West Bounding Coordinate
    -111.167
    East Bounding Coordinate
    -110.99
    Collections
    AZGS Document Repository

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