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Book Chapter

Tectonic evolution of the San Juan Islands thrust system, Washington

By
E.H. Brown
E.H. Brown
Department of Geology, Western Washington University, Bellingham, Washington 98225, USA
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B.A. Housen
B.A. Housen
Department of Geology, Western Washington University, Bellingham, Washington 98225, USA
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E.R. Schermer
E.R. Schermer
Department of Geology, Western Washington University, Bellingham, Washington 98225, USA
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Published:
January 01, 2007

Abstract

The mid-Cretaceous San Juan Islands–northwest Cascades thrust system is made up of six or more nappes that are a few kilometers or less thick, up to one hundred kilometers in breadth, and that were derived from previously accreted Paleozoic and Mesozoic terranes. This field trip addresses many questions regarding the tectonic evolution of this structural complex, including the homeland of the terranes and the process of post-accretionary dispersal that brought them together, how thrusting in the San Juan Islands might have been related to coeval orogenic activity in the neighboring Coast Plutonic Complex, and the origin of blueschist metamorphism in the thrust system relative to subduction and nappe emplacement. The geology of this trip has many counterparts in other outboard regions of the Cordillera, but some aspects of the tectonic processes, as we understand them to date, seem to be unique.

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Contents

GSA Field Guide

Floods, Faults, and Fire

Pete Stelling
Pete Stelling
Geology Department Western Washington University 516 High St., MS 9080 Bellingham, Washington 98225 USA
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David S. Tucker
David S. Tucker
Geology Department Western Washington University 516 High St., MS 9080 Bellingham, Washington 98225 USA
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Geological Society of America
Volume
9
ISBN electronic:
9780813756097
Publication date:
January 01, 2007

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