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Eocene extension in Idaho generated massive sediment floods into the Franciscan trench and into the Tyee, Great Valley, and Green River basins

2012; Geological Society of America; Volume: 41; Issue: 2 Linguagem: Inglês

10.1130/g33746.1

1943-2682

Trevor A. Dumitru, E. Ernst, James E. Wright, Joseph L. Wooden, Ray E. Wells, L. P. Farmer, Adam J.R. Kent, Stephan A. Graham,

Geological formations and processes

Research Article| February 01, 2013 Eocene extension in Idaho generated massive sediment floods into the Franciscan trench and into the Tyee, Great Valley, and Green River basins Trevor A. Dumitru; Trevor A. Dumitru 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar W.G. Ernst; W.G. Ernst 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar James E. Wright; James E. Wright 2Department of Geology, University of Georgia, Athens, Georgia 30602, USA Search for other works by this author on: GSW Google Scholar Joseph L. Wooden; Joseph L. Wooden 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar Ray E. Wells; Ray E. Wells 3U.S. Geological Survey, 345 Middlefield Road, MS 973, Menlo Park, California 94025, USA Search for other works by this author on: GSW Google Scholar Lucia P. Farmer; Lucia P. Farmer 4College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Adam J.R. Kent; Adam J.R. Kent 4College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Stephan A. Graham Stephan A. Graham 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar Geology (2013) 41 (2): 187–190. https://doi.org/10.1130/G33746.1 Article history received: 14 Jun 2012 rev-recd: 15 Aug 2012 accepted: 17 Aug 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Trevor A. Dumitru, W.G. Ernst, James E. Wright, Joseph L. Wooden, Ray E. Wells, Lucia P. Farmer, Adam J.R. Kent, Stephan A. Graham; Eocene extension in Idaho generated massive sediment floods into the Franciscan trench and into the Tyee, Great Valley, and Green River basins. Geology 2013;; 41 (2): 187–190. doi: https://doi.org/10.1130/G33746.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Franciscan Complex accretionary prism was assembled during an ∼165-m.y.-long period of subduction of Pacific Ocean plates beneath the western margin of the North American plate. In such fossil subduction complexes, it is generally difficult to reconstruct details of the accretion of continent-derived sediments and to evaluate the factors that controlled accretion. New detrital zircon U-Pb ages indicate that much of the major Coastal belt subunit of the Franciscan Complex represents a massive, relatively brief, surge of near-trench deposition and accretion during Eocene time (ca. 53–49 Ma). Sediments were sourced mainly from the distant Idaho Batholith region rather than the nearby Sierra Nevada. Idaho detritus also fed the Great Valley forearc basin of California (ca. 53–37 Ma), the Tyee forearc basin of coastal Oregon (49 to ca. 36 Ma), and the greater Green River lake basin of Wyoming (50–47 Ma). Plutonism in the Idaho Batholith spanned 98–53 Ma in a contractional setting; it was abruptly superseded by major extension in the Bitterroot, Anaconda, Clearwater, and Priest River metamorphic core complexes (53–40 Ma) and by major volcanism in the Challis volcanic field (51–43 Ma). This extensional tectonism apparently deformed and uplifted a broad region, shedding voluminous sediments toward depocenters to the west and southeast. In the Franciscan Coastal belt, the major increase in sediment input apparently triggered a pulse of massive accretion, a pulse ultimately controlled by continental tectonism far within the interior of the North American plate, rather than by some tectonic event along the plate boundary itself. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.