Reconnaissance Geology: Salt River - from Roosevelt Dam to Granite Reef Dam, Central Arizona

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Author
Scarborough, R.B.
Issue Date
1981-06-01
Keywords
Arizona Geological Survey Open File Reports
Neogene
Cenozoic
Tertiary
Proterozoic
Quaternary
Saguaro Lake
Mesquite Flat
Orme damsite
Goldfield Mountains

Metadata
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Citation
Scarborough, R.B., 1981, Reconnaissance Geology: Salt River - from Roosevelt Dam to Granite Reef Dam, Central Arizona. Arizona Geological Survey Open File Report, OFR-81-30, 9 map sheet, map scale 1:24,000, 79 p.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
The accompanying geologic maps depict the general geology of a two-mile wide strip centered about the Salt River, starting just below Roosevelt Dam and extending westward 36 miles to just below Granite Reef Dam. The geology was accomplished from October 1980 through April 1981, with the aid of about 25 hours of helicopter logistical support time. Discussions and/or field assistance by Mike Pryor, Joe Bailey, Dick Raymond, Paul Damon, and Tom McGarvin are greatly appreciated. Geologic Summary The lower Salt River below Roosevelt Dam has cut a gorge which exposes much of the geology of the northern Superstition volcanic field. The silicic field of late Oligocene (?) and Miocene age is one of the half dozen or so found in southern and western Arizona. The volcanics extend continuously from around Apache Lake Resort westward to Stewart Mountain Dam, and discontinuously farther west to the Mt. McDowell area, around Granite Reef Dam. The Superstition volcanics were deposited on Precambrian crystalline rocks, dominated by a biotite quartz monzonite which age dates at about 1400 m.y., and which is probably equivalent to the Ruin and Oracle granites further east and south. The northern Superstition volcanics are dominated by silicic pryoclastics, plugs, ash flows, agglomerates, and late stage intrusive domes. Rocks of andesitic composition are subordinate in volume although important in the eastern part of the area.
URI
http://hdl.handle.net/10150/630649
Additional Links
https://library.azgs.arizona.edu/
Language
en
Series/Report no.
OFR-81-30
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
33.9418
South Bounding Coordinate
33.5581
West Bounding Coordinate
-111.522
East Bounding Coordinate
-110.962
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