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Subduction initiation, subduction accretion and nonaccretion, large-scale material movement, and localization of subduction megaslip recorded in Franciscan complex and related rocks, California

By
John Wakabayashi
John Wakabayashi
Department of Earth and Environmental Sciences, California State University–Fresno, 2576 E. San Ramon Avenue, Mail Stop ST-24, Fresno, California 93740-8039, USA,
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Published:
January 01, 2013

Abstract

The Franciscan complex of California provides the ideal field laboratory to examine the rock record of subduction. This field trip guide describes a two-day field trip of the 2013 Geological Society of America Cordilleran Section Meeting. The field stops include a stop along the Panoche Road in the southern Diablo Range, and four in the San Francisco Bay region: one on the southern margin of the California State University East Bay campus in the Hayward Hills; one, with additional optional stops, at El Cerrito quarry north of Berkeley; one at Ring Mountain on Tiburon Peninsula; and the final stop at Rodeo Cove of the Marin Headlands. The geology seen at these stops provides insight into subduction initiation processes, subduction accretion and subduction erosion, accretion of ocean plate stratigraphy, mélange evolution, multiple burial-exposure cycles, exhumation of high-pressure metamorphic rocks, localization of subduction megathrust slip, large-scale subduction complex architecture, and spreading ridge deformation. The field trip stops will captivate visitors with their scenic beauty as well as their interesting geology.

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Contents

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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