RUBIDIUM-STRONTIUM AGES OF SOME BASEMENT ROCKS FROM ARIZONA AND NORTHWESTERN MEXICO

BRUNO J GILETTI; PAUL E DAMON

doi:10.1130/0016-7606(1961)72[639:RAOSBR]2.0.CO;2

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Research Article| April 01, 1961

RUBIDIUM-STRONTIUM AGES OF SOME BASEMENT ROCKS FROM ARIZONA AND NORTHWESTERN MEXICO

BRUNO J GILETTI;

BRUNO J GILETTI

DEPT. OF GEOLOGY, BROWN UNIVERSITY, PROVIDENCE, R. I.; DEPT. OF GEOLOGY, UNIVERSITY OF ARIZONA, TUCSON, ARIZ.

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PAUL E DAMON

DEPT. OF GEOLOGY, BROWN UNIVERSITY, PROVIDENCE, R. I.; DEPT. OF GEOLOGY, UNIVERSITY OF ARIZONA, TUCSON, ARIZ.

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Author and Article Information

BRUNO J GILETTI

DEPT. OF GEOLOGY, BROWN UNIVERSITY, PROVIDENCE, R. I.; DEPT. OF GEOLOGY, UNIVERSITY OF ARIZONA, TUCSON, ARIZ.

PAUL E DAMON

DEPT. OF GEOLOGY, BROWN UNIVERSITY, PROVIDENCE, R. I.; DEPT. OF GEOLOGY, UNIVERSITY OF ARIZONA, TUCSON, ARIZ.

Publisher: Geological Society of America

Received: 07 Nov 1960

First Online: 02 Mar 2017

Online ISSN: 1943-2674

Print ISSN: 0016-7606

GSA Bulletin (1961) 72 (4): 639–643.

https://doi.org/10.1130/0016-7606(1961)72[639:RAOSBR]2.0.CO;2

Abstract

Precambrian ages in the range 1200–1500 m.y. have been found by the Rb-Sr method for basement rocks in Arizona. The data extend the “1350 m.y.” orogeny to northwestern Arizona (Chloride granite) and southern Arizona (Oracle granite) near Tucson. Cretaceous-Tertiary ages were obtained from basement rocks in southern Arizona and northern Sonora, Mexico.

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