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    A Field Trip Guide To Sabino Canyon and the Mount Lemmon Highway, Pima County Arizona

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    Author
    Force, Eric
    Issue Date
    2001
    Keywords
    Arizona Geological Survey Contributed Reports
    Eocene age
    Arizona
    Pima County
    Mount Lemmon
    Sabino Canyon
    quartz
    feldspar
    igneous rock
    folds
    faults
    mylonitic gneiss
    Field Trip Guide
    Basin and Range Province
    Tertiary extension
    detachment fault
    core complex
    Oracle Granite
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    Citation
    Force, Eric, 2001, A Field Trip Guide To Sabino Canyon and the Mount Lemmon Highway, Pima County Arizona: Arizona Geological Survey Contributed Report CR-01-A, 37 p.
    Description
    The banded crystalline rocks of Sabino Canyon are a strong aesthetic component of the canyon's dramatic views. Certainly these rocks have attracted much attention from geologists. Until recently they were much-debated but poorly understood. When finally decoded (for example, Davis, 1980), these rocks and those of neighboring canyons became one of the best examples in the world of a "metamorphic core complex" (see also Saguaro National Park East). The main purposes of this trip are to acquaint the traveller with (1) the form of some large intrusions of formerly molten or igneous rock now cooled and solidified, (2) the effects of recrystallization and shearing to form a new rock called "mylonitic gneiss," (3) some faults and folds that formed later, and (4) more recent processes that cut the canyon itself. The intrusions are light-colored granitic rocks of Eocene age (about 50 million years). Granite is a coarse-grained igneous rock consisting mostly of feldspar and quartz. In this area the Eocene granites form sills, i.e. intrusions that parallel the structure of surrounding older rock or host rock. In this canyon, one granite sill, about 250 m (800) feet thick, forms the cliff-like upper canyon walls; two others can also be seen.
    URI
    http://hdl.handle.net/10150/628996
    Additional Links
    http://repository.azgs.az.gov/uri_gin/azgs/dlio/384
    Language
    en
    Series/Report no.
    CR-01-A
    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
    32.5958
    South Bounding Coordinate
    32.2713
    West Bounding Coordinate
    -110.934
    East Bounding Coordinate
    -110.566
    Collections
    AZGS Document Repository
    AZGS Document Repository
    AZGS Document Repository
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