Restoration of lithosphere-scale wrenching from integrated structural and tomographic data (Hercynian belt of western France)

Abstract

Research Article| April 01, 2004 Restoration of lithosphere-scale wrenching from integrated structural and tomographic data (Hercynian belt of western France) C. Gumiaux; C. Gumiaux 1Géosciences Rennes UMR 6118 Centre National de la Recherche Scientifique, Campus de Beaulieu, 35042 Rennes cedex, France Search for other works by this author on: GSW Google Scholar S. Judenherc; S. Judenherc 2Ecole et Observatoire des Sciences de la Terre, UMR 7516 Centre National de la Recherche Scientifique, 5 Rue René Descartes, 67084 Strasbourg cedex, France Search for other works by this author on: GSW Google Scholar J.-P. Brun; J.-P. Brun 3Géosciences Rennes UMR 6118 Centre National de la Recherche Scientifique, Campus de Beaulieu, 35042 Rennes cedex, France Search for other works by this author on: GSW Google Scholar D. Gapais; D. Gapais 3Géosciences Rennes UMR 6118 Centre National de la Recherche Scientifique, Campus de Beaulieu, 35042 Rennes cedex, France Search for other works by this author on: GSW Google Scholar M. Granet; M. Granet 5Ecole et Observatoire des Sciences de la Terre, UMR 7516 Centre National de la Recherche Scientifique, 5 Rue René Descartes, 67084 Strasbourg cedex, France Search for other works by this author on: GSW Google Scholar G. Poupinet G. Poupinet 6Laboratoire de Géophysique interne et de Tectonophysique, UMR 5559 Centre National de la Recherche Scientifique, 1381 Rue de la Piscine, 38041 Grenoble cedex, France Search for other works by this author on: GSW Google Scholar Author and Article Information C. Gumiaux 1Géosciences Rennes UMR 6118 Centre National de la Recherche Scientifique, Campus de Beaulieu, 35042 Rennes cedex, France S. Judenherc 2Ecole et Observatoire des Sciences de la Terre, UMR 7516 Centre National de la Recherche Scientifique, 5 Rue René Descartes, 67084 Strasbourg cedex, France J.-P. Brun 3Géosciences Rennes UMR 6118 Centre National de la Recherche Scientifique, Campus de Beaulieu, 35042 Rennes cedex, France D. Gapais 3Géosciences Rennes UMR 6118 Centre National de la Recherche Scientifique, Campus de Beaulieu, 35042 Rennes cedex, France M. Granet 5Ecole et Observatoire des Sciences de la Terre, UMR 7516 Centre National de la Recherche Scientifique, 5 Rue René Descartes, 67084 Strasbourg cedex, France G. Poupinet 6Laboratoire de Géophysique interne et de Tectonophysique, UMR 5559 Centre National de la Recherche Scientifique, 1381 Rue de la Piscine, 38041 Grenoble cedex, France Publisher: Geological Society of America Received: 27 Aug 2003 Revision Received: 15 Dec 2003 Accepted: 17 Dec 2003 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (4): 333–336. https://doi.org/10.1130/G20134.2 Article history Received: 27 Aug 2003 Revision Received: 15 Dec 2003 Accepted: 17 Dec 2003 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation C. Gumiaux, S. Judenherc, J.-P. Brun, D. Gapais, M. Granet, G. Poupinet; Restoration of lithosphere-scale wrenching from integrated structural and tomographic data (Hercynian belt of western France). Geology 2004;; 32 (4): 333–336. doi: https://doi.org/10.1130/G20134.2 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 Tomographic images of the mantle below the Hercynian belt of Brittany display strong anomalies of P-wave traveltimes that likely represent variations in composition, and whose trends change above and below 130 km. A quantitative strain analysis of surface geological structures has shown that the crust in the area was affected by regional-scale distributed simple shear. The change of trends of tomographic anomalies below and above 130 km is largely removed by extending the simple shear model down to 130 km. From this, we infer lithospheric-scale wrenching, and therefore deep-seated horizontal decoupling, possibly at the lithosphere-asthenosphere boundary. Simple shear restoration further provides arguments for the occurrence of a steeply dipping slab. Geological data support its interpretation as a remnant of oceanic lithosphere subducted prior to the Hercynian collision. Beyond regional implications, the study underlines the interest of combining geology and tomography for the understanding of lithosphere deformation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.