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<identifier>oai:HAL:insu-00150214v1</identifier>
<datestamp>2018-01-11</datestamp>
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<title lang=en>A Tertiary asthenospheric flow beneath the southern French Massif Central related to the west Mediterranean extension evidenced by upper mantle seismic anisotropy</title>
<creator>Barruol, Guilhem</creator>
<creator>Granet, Michel</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>Université Louis Pasteur – Strasbourg I Ecole Doctorale des Sciences de la Terre, de l'Univers et de l'Environnement Institut de Physique du Globe, UMR 7516 ULP-CNRS (IPGS-EOST) ; IPG Strasbourg - EOST</contributor>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>insu-00150214</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00150214</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00150214/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00150214/file/Barruol_Granet_EPSL2002_hal.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00150214</source>
<source>Earth and Planetary Science Letters, Elsevier, 2002, 202 (1), pp.31-47. 〈10.1016/S0012-821X(02)00752-5〉</source>
<identifier>DOI : 10.1016/S0012-821X(02)00752-5</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(02)00752-5</relation>
<language>en</language>
<subject lang=en>Shear wave splitting</subject>
<subject lang=en>anisotropy</subject>
<subject lang=en>Massif Central</subject>
<subject lang=en>asthenosphere</subject>
<subject lang=en>Tertiary extension</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Upper mantle flow beneath the French Massif Central is investigated using teleseismic shear wave splitting induced by seismic anisotropy. About 25 three component stations (short period, intermediate and broad-band) were installed during the period 1998-1999 in the southern Massif Central, from the Clermont Ferrand volcanic area to the Mediterranean sea. Teleseismic shear waves (SKS, SKKS and PKS) were used to determine the splitting parameters: the fast polarization direction and the delay time. Delay times ranging between 0.7 and 1.5 s have been observed at most of the sites. The azimuths of the fast split shear waves trend homogeneously NW-SE in the southern Massif Central suggesting a homogeneous mantle flow beneath this area. The observed NW-SE direction differs from the N100°E Pyrenean anisotropy further South. It does not appear to be correlated to Hercynian structures nor to the present-day motion of the plate but is well correlated to the Tertiary extension direction. We propose that the opening of the western Mediterranean induced by the rotation of the Corsica-Sardinia lithospheric bloc and the roll-back to the SE of the Tethys slab may have generated a large asthenospheric mantle flow beneath the southern Massif Central and a deflection of the up going plume centered beneath the northern Massif Central toward the SE.</description>
<date>2002</date>
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