dc.contributor.author	Scarborough, R.B.
dc.date.accessioned	2018-11-10T01:04:57Z
dc.date.available	2018-11-10T01:04:57Z
dc.date.issued	1981-06-01
dc.identifier.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.
dc.identifier.uri	http://hdl.handle.net/10150/630649
dc.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.
dc.language.iso	en
dc.publisher	Arizona Geological Survey (Tucson, AZ)
dc.relation.ispartofseries	OFR-81-30
dc.relation.url	https://library.azgs.arizona.edu/
dc.rights	Arizona Geological Survey. All rights reserved.
dc.subject	Arizona Geological Survey Open File Reports
dc.subject	Neogene
dc.subject	Cenozoic
dc.subject	Tertiary
dc.subject	Proterozoic
dc.subject	Quaternary
dc.subject	Saguaro Lake
dc.subject	Mesquite Flat
dc.subject	Orme damsite
dc.subject	Goldfield Mountains
dc.subject	Apache Lake
dc.subject	Horse Mesa Dam
dc.subject	Mt. McDowell
dc.subject	Stewart Mountain Dam
dc.subject	Superstition Volcanic Field
dc.subject	Mormon Flat
dc.subject	Granite Reef Dam
dc.subject	Roosevelt Dam
dc.subject	Salt river
dc.subject	granite
dc.subject	Whitetail conglomerate
dc.subject	quartz monzonite
dc.subject	reverse fault
dc.subject	high angle fault
dc.subject	andesite
dc.subject	domes
dc.subject	pyroclastics
dc.subject	agglomerate

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

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