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<title lang=en>EBSD-measured lattice-preferred orientations and seismic properties of eclogites</title>
<creator>Bascou, Jérôme</creator>
<creator>Barruol, Guilhem</creator>
<creator>Vauchez, Alain</creator>
<creator>Mainprice, David</creator>
<creator>Egydio-Silva, Marcos</creator>
<contributor>Laboratoire Magmas et Volcans (LMV) ; Université Blaise Pascal - Clermont-Ferrand 2 (UBP) - Institut national des sciences de l'Univers (INSU - CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - 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 de Tectonophysique (Tectonophysique) ; Université Montpellier 2 - Sciences et Techniques (UM2) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Universidade de São Paulo (USP)</contributor>
<description>International audience</description>
<source>ISSN: 0040-1951</source>
<source>EISSN: 1879-3266</source>
<source>Tectonophysics</source>
<publisher>Elsevier</publisher>
<identifier>hal-01389715</identifier>
<identifier>http://hal.univ-reunion.fr/hal-01389715</identifier>
<identifier>http://hal.univ-reunion.fr/hal-01389715/document</identifier>
<identifier>http://hal.univ-reunion.fr/hal-01389715/file/Bascou_eclo-sismo_tphy2001_hal.pdf</identifier>
<source>http://hal.univ-reunion.fr/hal-01389715</source>
<source>Tectonophysics, Elsevier, 2001, 342, pp.61 - 80. 〈10.1016/S0040-1951(01)00156-1〉</source>
<identifier>DOI : 10.1016/S0040-1951(01)00156-1</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/S0040-1951(01)00156-1</relation>
<language>en</language>
<subject lang=en>Electron backscatter diffraction (EBSD)</subject>
<subject lang=en>Lattice-preferred orientation (LPO)</subject>
<subject lang=en>Omphacite deformation</subject>
<subject lang=en>Numerical models</subject>
<subject lang=en>Seismic anisotropy</subject>
<subject lang=en>Reflectivity</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>We investigated the deformation mechanisms and the seismic properties of 10 eclogite samples from different localities (Alps, Norway, Mali and eastern China) through the analysis of their microstructures and lattice-preferred orientations (LPO). These samples are representative of various types and intensity of deformation under eclogitic metamorphic conditions. Omphacite and garnet LPO were determined from electron backscatter diffraction (EBSD) technique. Garnet appears to be almost randomly oriented whereas omphacite develops strong LPO, characterized by the [001]-axes concentrated sub-parallel to the lineation, and the (010)-poles concentrated sub-perpendicular to the foliation. In order to analyze the deformation mechanisms that produced such omphacite LPO, we compare our observations to LPO simulated by viscoplastic self-consistent numerical models. A good fit to the measured LPO is obtained for models in which the dominant slip systems are 1/2h110i{11 ¯ 0}, [001] {110} and [001] (100). Dominant activation of these slip systems is in agreement with TEM studies of naturally deformed omphacite. Seismic properties of eclogite are calculated by combining the measured LPO and the single crystal elastic constants of omphacite and garnet. Although eclogite seismic anisotropies are very weak (less than 3% for both P-and S-wave), they are generally characterized by a maximum P-wave velocity sub-parallel to the lineation and by a minimum velocity approximately normal to foliation. The mean P-and S-wave velocities are high (respectively, 8.6 and 4.9 km/s). The S-wave anisotropy pattern displays complex relationships with the structural frame but the fast polarization plane generally tends to be parallel to the foliation. Calculated reflection coefficients show that an eclogite/crust interface is generally a good reflector (Rc > 0.1), whereas an eclogite body embedded in the upper mantle would be hardly detectable. </description>
<date>2001</date>
</dc>
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