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Late Cenozoic basaltic magmatism in the Salton Trough: Implications for tectonic development

By
Charles T. Herzig
Charles T. Herzig
Department of Earth Sciences, University of California,, Riverside, California 92521
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David C. Jacobs
David C. Jacobs
Unocal Science and Technology Division, P.O. Box 76,, Brea, California, 92621
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Published:
January 01, 1991

Abstract

The geochemistry of late Cenozoic basalts within the Salton Trough of southern California suggests that crustal extension has occurred in two very different tectonic settings. Initial extension of thick continental crust occurred during the Oligocene-Miocene, leading to the alkalic basalts now located along the trough margins. Following an ~10 Ma hiatus in igneous activity, tholeiitic basalts have been emplaced during the past 4 Ma along the trough axis as oceanic spreading centers of the East Pacific Rise – Gulf of California transtensional system exploited the previously extended and thinned crust of the North American continent. The correlation of basaltic xenoliths in the Quaternary rhyolite of Salton Buttes with oceanic rocks in the Gulf of California is strengthened in this study by new radiometric ages, and geochemical and isotopic data. In addition, a new U-Pb age of <100,000 years for zircons from a granophyre xenolith in the rhyolite of Salton Buttes does not support the presence of pre-Tertiary, crystalline materials within this spreading center.

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Contents

Society of Economic Geologists Guidebook Series

The Diversity of Mineral and Energy Resources of Southern California

Michael A. McKibben
Michael A. McKibben
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Society of Economic Geologists
Volume
12
ISBN electronic:
9781934969656
Publication date:
January 01, 1991

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