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Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes

GSA Special Papers

Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes

Author(s)

Geological Society of America

Volume

456

DOI:

https://doi.org/10.1130/SPE456

Copyright:

© 2009 Geological Society of America

Attribution:You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Noncommercial - you may not use this work for commercial purpose. No Derivative works - You may not alter, transform, or build upon this work. Sharing - Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.

ISBN print:

9780813724560

Publication date:

January 01, 2009

Book Chapter

Granulite- to amphibolite-facies metamorphism and penetrative deformation in a disrupted ophiolite, Klamath Mountains, California: A deep view into the basement of an accreted oceanic arc

Author(s)

Sarah R. Garlick

Sarah R. Garlick

Department of Geology and Geophysics, Department 3006, 1000 East University Avenue, University of Wyoming, Laramie, Wyoming 82071, USA

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L. Gordon Medaris, Jr.

L. Gordon Medaris, Jr.

Department of Geology and Geophysics, University of Wisconsin, 1215 West Dayton Street, Madison, Wisconsin 53706, USA

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Arthur W. Snoke

Arthur W. Snoke

Department of Geology and Geophysics, Department 3006, 1000 East University Avenue, University of Wyoming, Laramie, Wyoming 82071, USA

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Joshua J. Schwartz

Joshua J. Schwartz

Department of Geology and Geophysics, Department 3006, 1000 East University Avenue, University of Wyoming, Laramie, Wyoming 82071, USA

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Susan M. Swapp

Department of Geology and Geophysics, Department 3006, 1000 East University Avenue, University of Wyoming, Laramie, Wyoming 82071, USA

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Doi:

https://doi.org/10.1130/2009.2456(06)

Published:

January 01, 2009

Neogene doming in the north-central Klamath Mountains, California, tilted the Rattlesnake Creek terrane, chiefly an ophiolitic mélange, exposing an oblique cross section through disrupted and metamorphosed oceanic crust and mantle. The deepest section of the tilted terrane, in the Kangaroo Mountain area near Seiad Valley, contains tectonic slices of ultramafic, mafic, and sedimentary rocks that were penetratively deformed and metamorphosed under upper-amphibolite- to granulite-facies conditions. This section, called the Seiad complex, is the ophiolitic basement of an accreted Mesozoic island arc, and its polygenetic history reflects the magmatic and tectonic processes that occur during island-arc construction and evolution.

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