Sixteen 40Ar/39Ar geochronology analyses from southeastern Arizona

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Author
Peters, L.
Ferguson, C.A.
Spencer, J.E.
Orr, T.R.
Dickinson, W.R.
Issue Date
2003-05-01
Keywords
Arizona Geological Survey Open File Reports
Pima County
Roskruge Mountains
Santa Rita Mountains
San Pedro Trough Area
Cienega Gap Area
Black Mountains
Tortolita Mountains
Tucson
Arizona

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Citation
Peters, L., Ferguson, C.A., Spencer, J.E., Orr, T.R., and Dickinson, W.R., 2003, Sixteen 40Ar/39Ar geochronology analyses from southeastern Arizona. Arizona Geological Survey Open File Report, OFR-03-02, 46 p.
Description
The results of 40 Ar/39 Ar analyses of 15 samples of rhyolitic ash-flow tuffs and one sample of a dacitic dome from Mid-Tertiary and Cretaceous volcanic successions in the Tucson area are presented in this report. Most of the samples were collected from variably tilted Mid-Tertiary supracrustal successions surrounding the Catalina metamorphic core complex in the Tortolita Mountains, Black Mountain, San Pedro trough, and Cienega Gap areas. Four samples of Upper Cretaceous ash-flow tuffs from the Santa Rita and Roskruge Mountains were also collected. Ten samples (FO-660, FO-927, FL-354, FK-1336, FK-1702, FK-1706, FK-1707, FK-1832, FK-3062 and FK-3277) were submitted in the fall of 200 1. Sanidine was separated from all but samples FK-3062 and FK-3277 from which biotite was separated (sample preparation in Table 1). In May of 2002, six additional rhyolites were submitted (CAF-02-1680, CAF-02-3628, T02-715, JES-3-26-02-1, WRD-CPH-l and WRD-CPH-2). Sanidine was separated from all of these samples. (4 pages)
URI
http://hdl.handle.net/10150/629965
Additional Links
https://library.azgs.arizona.edu/
Language
en
Series/Report no.
OFR-03-02
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
32.3336
South Bounding Coordinate
31.5598
West Bounding Coordinate
-111.434
East Bounding Coordinate
-110.511
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