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<title lang=en>Belt-parallel mantle flow beneath a halted continental collision: The Western Alps</title>
<creator>Barruol, Guilhem</creator>
<creator>Bonnin, Mickael</creator>
<creator>Pedersen, Helle</creator>
<creator>Bokelmann, Götz H.R.</creator>
<creator>Tiberi, Christel</creator>
<contributor>Institut de Physique du Globe de Paris (IPGP) ; Institut national des sciences de l'Univers (INSU - CNRS) - IPG PARIS - Université Paris Diderot - Paris 7 (UPD7) - Université de la Réunion (UR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<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>Laboratoire GéoSciences Réunion (LGSR) ; Université de la Réunion (UR) - Institut de Physique du Globe de Paris</contributor>
<contributor>Ondes et Structures (Isterre) ; Institut des Sciences de la Terre (ISTerre) ; Université Joseph Fourier - Grenoble 1 (UJF) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut national des sciences de l'Univers (INSU - CNRS) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS) - Université Joseph Fourier - Grenoble 1 (UJF) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut national des sciences de l'Univers (INSU - CNRS) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institute of Meteorology and Geophysics [Vienna] (IMG) ; University of Vienna [Vienna]</contributor>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-00617828</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00617828</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00617828/document</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00617828/file/Barruol_SKS_Alpes_EPSL2011_hal.pdf</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00617828</source>
<source>Earth and Planetary Science Letters, Elsevier, 2011, 302 (3-4), pp.429-438. 〈10.1016/j.epsl.2010.12.040〉</source>
<identifier>DOI : 10.1016/j.epsl.2010.12.040</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2010.12.040</relation>
<language>en</language>
<subject lang=en>Western Alps</subject>
<subject lang=en>upper mantle</subject>
<subject lang=en>seismic anisotropy</subject>
<subject lang=en>SKS splitting</subject>
<subject lang=en>lithosphere</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Constraining mantle deformation beneath plate boundaries where plates interact with each other, such as beneath active or halted mountain belts, is a particularly important objective of "mantle tectonics" that may bring a depth extent to the Earth's surface observation. Such mantle deformation can be mapped at scale lengths of several tens of kilometers through the analysis of seismological data and particularly by mapping seismic anisotropy from the splitting analysis of vertically-propagating SKS waves that largely reflect the strain-induced crystal preferred orientations of the rock-forming minerals within the upper mantle. In the present study, we analyse data from approximately 50 broadband seismic stations covering the Western Alps and we provide a coherent picture of upper mantle anisotropy beneath the belt. The large-scale anisotropy pattern is characterized by fast split directions that closely follow the trend of the belt. Moreover, the maximum anisotropy magnitude is not located beneath the internal zones of the belt but instead beneath external units. All suggests that the anisotropy is likely dominated by sublithospheric mantle deformation. We propose that the observed anisotropy pattern can be explained by recent or active mantle flow around the Eurasian slab presently plunging beneath the inner parts of the Alps.</description>
<date>2011</date>
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