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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Structural reactivation in plate tectonics controlled by olivine crystal anisotropy</title>
<creator>Tommasi, Andrea</creator>
<creator>Knoll, Mickael</creator>
<creator>Vauchez, Alain</creator>
<creator>Signorelli, J.</creator>
<creator>Thoraval, Catherine</creator>
<creator>Logé, Roland E.</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Instituto de Fisica de Rosario, CONICET, Universidad Nacional de Rosario ; Université du Québec</contributor>
<contributor>Centre de Mise en Forme des Matériaux (CEMEF) ; MINES ParisTech - École nationale supérieure des mines de Paris - PSL Research University (PSL) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 1752-0894</source>
<source>Nature Geoscience</source>
<publisher>Nature Publishing Group</publisher>
<identifier>hal-00413033</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00413033</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00413033</source>
<source>Nature Geoscience, Nature Publishing Group, 2009, 2 (6), pp.423-427. 〈10.1038/ngeo528〉</source>
<identifier>DOI : 10.1038/ngeo528</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo528</relation>
<language>en</language>
<subject lang=en>olivine</subject>
<subject lang=en>plate tectonics</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Reactivation of structures inherited from previous collisional or rifting events, especially lithospheric-scale faults, is a major feature of plate tectonics. Its expression ranges from continental break-up along ancient collisional belts(1,2) to linear arrays of intraplate magmatism and seismicity(3,4). Here we use multiscale numerical models to show that this reactivation can result from an anisotropic mechanical behaviour of the lithospheric mantle due to an inherited preferred orientation of olivine crystals. We explicitly consider an evolving anisotropic viscosity controlled by the orientation of olivine crystals in the mantle. We find that strain is localized in domains where shear stresses on the inherited mantle fabric are high, and that this leads to shearing parallel to the inherited fabric. During rifting, structural reactivation induced by anisotropy results in oblique extension, followed by either normal extension or failure. Our results suggest that anisotropic viscosity in the lithospheric mantle controls the location and orientation of intraplate deformation zones that may evolve into new plate boundaries, and causes long-lived lithospheric-scale wrench faults, contributing to the toroidal component of plate motions on Earth.</description>
<date>2009</date>
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