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Sedimentary, volcanic, and structural processes during triple-junction migration: Insights from the Paleogene record in central Washington

By
Michael P. Eddy
Michael P. Eddy
Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA
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Paul J. Umhoefer
Paul J. Umhoefer
School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, Arizona 86011, USA
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Robert B. Miller
Robert B. Miller
Department of Geology, San Jose State University, San Jose, California 95192, USA
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Erin E. Donaghy
Erin E. Donaghy
School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, Arizona 86011, USA, and ConocoPhillips, 600 North Dairy Ashford, Houston, Texas 77079, USA
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Melissa Gundersen
Melissa Gundersen
School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, Arizona 86011, USA
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Francesca I. Senes
Francesca I. Senes
Department of Geology, San Jose State University, San Jose, California 95192, USA
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Published:
January 01, 2017
Publication history
31 July 2017

ABSTRACT

This guide describes a three-day field trip to the Paleogene sedimentary and volcanic rocks exposed between the Straight Creek–Fraser River and Entiat faults in the central Washington Cascades. These rocks record a history of deposition, deformation, and magmatism that can be linked to tectonic events along the North American margin using a robust chronology coupled with detailed sedimentological, stratigraphic, and structural studies. These events include deposition in a large sedimentary basin (Swauk basin) that formed in the forearc from <59.9–50 Ma; disruption and deformation of this basin related to the accretion of the Siletzia oceanic plateau between 51 and 49 Ma; the initiation, or acceleration of right-lateral, strike-slip faulting and the development of at least one strike-slip sedimentary basin (Chumstick basin) starting ca. 49 Ma; and the re-establishment of a regional depositional system after ca. 45–44 Ma (Roslyn basin) as strike-slip faulting was localized on the Straight Creek–Fraser River fault. These events are compatible with the presence of the Kula-Farallon ridge near the latitude of Washington ca. 50 Ma and its southward movement, or jump, following the accretion of Siletzia. This trip visits key outcrops that highlight this history and links them to regional studies of sedimentation, faulting, and magmatism to better understand the geologic record of this tectonic setting.

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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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