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Mesozoic metasedimentary framework and gabbroids of the Early Cretaceous Sierra Nevada batholith, California

By
Diane Clemens-Knott
Diane Clemens-Knott
Department of Geological Sciences, California State University, Fullerton, California 92834, USA.
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Jason B. Saleeby
Jason B. Saleeby
Division of Earth and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA.
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Published:
January 01, 2013

Abstract

Petrologic, structural, geochronologic, and geochemical data from rocks exposed in the western foothills of the Sierra Nevada batholith just south of the western Foothills metamorphic belt (the Stokes Mountain region) provide new insight regarding several poorly understood aspects of the development of the compound Sierra Nevada arc. Exposures of three different metasedimentary packages together document transitions in the depositional environments present along the outboard edge of this arc segment throughout the Mesozoic Era, culminating in the emergence of the Cretaceous continental margin arc. Exposures of mafic cumulates and associated differentiates of the Early Cretaceous batholith permit investigation into the earliest stages of differentiation of depleted-mantle–derived arc magmas. Together with the surrounding Kings-Kaweah ophiolite belt, these Mesozoic plutonic and metasedimentary rocks are proposed to form an analog for the crystalline basement underlying much of the eastern half of the Great Valley forearc basin.

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GSA Field Guide

Geologic Excursions from Fresno, California, and the Central Valley

Keith Putirka
Keith Putirka
Department of Earth and Environmental Sciences California State University, Fresno 2576 E. San Ramon Ave. M/S ST24 Fresno, California 93740 USA
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Geological Society of America
Volume
32
ISBN electronic:
9780813756325
Publication date:
January 01, 2013

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