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Mesozoic terranes of the central Cascades: Geology of the Hicks Butte complex, Easton Metamorphic Suite, Peshastin Formation and Ingalls ophiolite complex

By
James H. MacDonald, Jr.
James H. MacDonald, Jr.
Department of Marine and Ecological Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard, South Fort Myers, Florida 33965, USA
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Joe D. Dragovich
Joe D. Dragovich
Associated Earth Sciences, Inc., 1552 Commerce Street, Suite 102, Tacoma, Washington 98402, USA
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Mark E. Pecha
Mark E. Pecha
Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA
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Glenn T. Thompson
Glenn T. Thompson
Department of Marine and Ecological Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard, South Fort Myers, Florida 33965, USA
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Shanna C. Stingu
Shanna C. Stingu
Department of Marine and Ecological Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard, South Fort Myers, Florida 33965, USA
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Alex D. Maruszczak
Alex D. Maruszczak
Department of Marine and Ecological Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard, South Fort Myers, Florida 33965, USA
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Kristy M. Zalud
Kristy M. Zalud
Department of Marine and Ecological Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard, South Fort Myers, Florida 33965, USA
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Scott H. Milliken
Scott H. Milliken
Department of Marine and Ecological Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard, South Fort Myers, Florida 33965, USA
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Published:
January 01, 2017
Publication history
13 July 2017

ABSTRACT

This paper reviews the Mesozoic terranes in the central Cascades, south of the Windy Pass thrust and east of the Straight Creek–Fraser River fault, and provides a guide to field locations for these units. These include the Easton Metamorphic Suite, Hicks Butte complex and higher-grade tectonic zone, the Peshastin Formation, and the Ingalls ophiolite complex (also known as the Ingalls terrane). Age data, whole rock and mineral chemistry, and structural data are reviewed. These oceanic- and arcaffinity terranes formed outboard of the North American craton during the Jurassic and accretion likely occurred during the Late Jurassic or Early Cretaceous. They were then dextrally translated north and emplaced in Washington State during the Late Cretaceous. A better understanding of these Mesozoic terranes will more closely constrain the tectonic development of the North American Cordillera.

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Contents

GSA Field Guides

From the Puget Lowland to East of the Cascade Range: Geologic Excursions in the Pacific Northwest

Ralph A. Haugerud
Ralph A. Haugerud
U.S. Geological Survey c/o Department of Earth and Space Sciences University of Washington, Box 351310 Seattle, Washington 98195, USA
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Harvey M. Kelsey
Harvey M. Kelsey
Geology Department Humboldt State University 1 Harpst Street Arcata, California 95521, USA
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Geological Society of America
Volume
49
ISBN electronic:
9780813756493
Publication date:
January 01, 2017

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