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Open-File Report 2015–1023

Geologic Map of the Patagonia Mountains, Santa Cruz County, Arizona

By Frederick T. Graybeal, Lorre A. Moyer, Peter G. Vikre, Pamela Dunlap, and John C. Wallis

Thumbnail of and link to OFR 2015-1023 map (38.3 MB)Abstract

The Patagonia Mountains contain two large porphyry Cu-Mo systems each with separate associated hypogene and supergene zones, two high-grade Cu-Mo breccia pipes, one large epithermal Ag-Pb-Zn-Mn deposit, and numerous additional areas of base- and precious-metal mineralization all zoned around a Laramide-age composite batholith of intermediate composition. Compilations and new work by Vikre and others (2014) have identified as many as eight separate intrusive phases of the batholith and five separate hydrothermal events spanning at least 16 m.y., in addition to a supergene enrichment event of middle Tertiary age. The geologic map presents a spatial context for this important new information that is intended to support further work in this highly mineralized region.

Several spatial databases provide data for the geologic map of the Patagonia Mountains in Arizona. The data can be viewed and queried in ArcGIS 10, a geographic information system; a geologic map is also available in PDF format. All products are available online only.

First posted February 3, 2015

This publication is online only

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S.G.S., c/o University of Arizona
ENRB Bldg, 520 N. Park Ave, Rm 355
Tucson, AZ 85719-5035

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Suggested citation:

Graybeal, F.T., Moyer, L.A., Vikre, P.G., Dunlap, P., and Wallis, J.C., 2015, Geologic map of the Patagonia Mountains, Santa Cruz County, Arizona: U.S. Geological Survey Open-File Report 2015–1023, 10 p., 1 sheet, scale 1:48,000,

ISSN 2331-1258 (online)

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