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Reaction-induced embrittlement of the lower continental crust

2019; Geological Society of America; Volume: 47; Issue: 3 Linguagem: Inglês

10.1130/g45527.1

1943-2682

Sarah Incel, Loïc Labrousse, Nadège Hilairet, Timm John, Julien Gasc, Feng Shi, Yanbin Wang, Torgeir B. Andersen, François Renard, Bjørn Jamtveit, Alexandre Schubnel,

High-pressure geophysics and materials

Research Article| January 29, 2019 Reaction-induced embrittlement of the lower continental crust Sarah Incel; Sarah Incel * 1Physics of Geological Processes, The Njord Centre, Department of Geosciences, University of Oslo, P.O. Box 1048, Blindern, 0316 Oslo, Norway2Laboratoire de Géologie de l'ENS, PSL Research University, UMR8538 du CNRS, 24 Rue Lhomond, 75005 Paris, France *E-mail: s.h.m.incel@geo.uio.no Search for other works by this author on: GSW Google Scholar Loïc Labrousse; Loïc Labrousse 3CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP, UMR 7193, Sorbonne Université, 75005 Paris, France Search for other works by this author on: GSW Google Scholar Nadège Hilairet; Nadège Hilairet 4Université Lille, CNRS, INRA, ENSCL, UMR 8207 - UMET–Unité Matériaux et Transformations, F-59000 Lille, France Search for other works by this author on: GSW Google Scholar Timm John; Timm John 5Institute of Geological Sciences, Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany Search for other works by this author on: GSW Google Scholar Julien Gasc; Julien Gasc 2Laboratoire de Géologie de l'ENS, PSL Research University, UMR8538 du CNRS, 24 Rue Lhomond, 75005 Paris, France Search for other works by this author on: GSW Google Scholar Feng Shi; Feng Shi 6Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA Search for other works by this author on: GSW Google Scholar Yanbin Wang; Yanbin Wang 6Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA Search for other works by this author on: GSW Google Scholar Torgeir B. Andersen; Torgeir B. Andersen 7Centre for Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar François Renard; François Renard 1Physics of Geological Processes, The Njord Centre, Department of Geosciences, University of Oslo, P.O. Box 1048, Blindern, 0316 Oslo, Norway8Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France Search for other works by this author on: GSW Google Scholar Bjørn Jamtveit; Bjørn Jamtveit 1Physics of Geological Processes, The Njord Centre, Department of Geosciences, University of Oslo, P.O. Box 1048, Blindern, 0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar Alexandre Schubnel Alexandre Schubnel 2Laboratoire de Géologie de l'ENS, PSL Research University, UMR8538 du CNRS, 24 Rue Lhomond, 75005 Paris, France Search for other works by this author on: GSW Google Scholar Geology (2019) 47 (3): 235–238. https://doi.org/10.1130/G45527.1 Article history received: 27 Aug 2018 rev-recd: 20 Dec 2018 accepted: 03 Jan 2019 first online: 29 Jan 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Sarah Incel, Loïc Labrousse, Nadège Hilairet, Timm John, Julien Gasc, Feng Shi, Yanbin Wang, Torgeir B. Andersen, François Renard, Bjørn Jamtveit, Alexandre Schubnel; Reaction-induced embrittlement of the lower continental crust. Geology 2019;; 47 (3): 235–238. doi: https://doi.org/10.1130/G45527.1 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 Field observations and geophysical data reveal a causal link between brittle seismic failure and eclogitization of the lower continental crust. We present results from experimental deformation of plagioclase-rich samples at eclogite-facies conditions and quantify the link between rock rheology and the kinetics of the eclogitization reactions. The deformation was ductile both in the absence of reaction and when the progress of eclogitization was fast compared to the imposed strain rate. However, when the reaction rate was relatively slow, the breakdown of plagioclase into nanocrystalline reaction products triggered embrittlement, highlighted by a high acoustic emission activity. Fluid-induced plagioclase breakdown under eclogite-facies conditions is an exothermic reaction accompanied by a negative change in solid volume. This is similar to other mineral transformations that are known to trigger transformational faulting. We demonstrate that mineral reactions lead to brittle deformation in situations where reaction rates are slow compared to the deformation rate. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.