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
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