Comments on the growth of accretionary wedges

Abstract

Research Article| January 01, 1985 Comments on the growth of accretionary wedges Eli A. Silver; Eli A. Silver 1Earth Sciences Board and Center for Marine Studies, University of California, Santa Cruz, California 95064 Search for other works by this author on: GSW Google Scholar Martha J. Ellis; Martha J. Ellis 2Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 Search for other works by this author on: GSW Google Scholar Nancy A. Breen; Nancy A. Breen 3Earth Sciences Board, University of California, Santa Cruz, California 95064 Search for other works by this author on: GSW Google Scholar Thomas H. Shipley Thomas H. Shipley 4Institute for Geophysics, University of Texas, Austin, Texas 78751 Search for other works by this author on: GSW Google Scholar Author and Article Information Eli A. Silver 1Earth Sciences Board and Center for Marine Studies, University of California, Santa Cruz, California 95064 Martha J. Ellis 2Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 Nancy A. Breen 3Earth Sciences Board, University of California, Santa Cruz, California 95064 Thomas H. Shipley 4Institute for Geophysics, University of Texas, Austin, Texas 78751 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1985) 13 (1): 6–9. https://doi.org/10.1130/0091-7613(1985)13<6:COTGOA>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Eli A. Silver, Martha J. Ellis, Nancy A. Breen, Thomas H. Shipley; Comments on the growth of accretionary wedges. Geology 1985;; 13 (1): 6–9. doi: https://doi.org/10.1130/0091-7613(1985)13<6:COTGOA>2.0.CO;2 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 Uplift within accretionary foreland wedges has been explained by the development of duplexes, which provides a mechanism for "underplating" in submarine accretionary wedges with little deformation in the upper part of the wedge. We interpret duplex development beneath the Costa Rica forearc, a zone widely considered to be a prime example of nonaccretion because of the apparent absence of an imbricate fan of thrusts at the toe of the wedge. Large-scale structural geometry of accretionary wedges is compatible with low-angle, trenchward-dipping backstops in centrist to reverse-angle backstops used commonly in models of return flow within wedges, which have been invoked to explain the presence of high-P/T metamorphic rocks. We suggest that emplacement of high-P/T metamorphic rocks are better explained in a collisional setting where known uplift rates are high than by flow within noncollisional accretionary wedges. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.