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<identifier>oai:HAL:hal-00412594v1</identifier>
<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>B-type olivine fabrics developed in the fore-arc side of the mantle wedge along a subducting slab</title>
<creator>Tasaka, M.</creator>
<creator>Michibayashi, K.</creator>
<creator>MAINPRICE, David</creator>
<contributor>Department of Earth and Planetary Science [Tokyo] ; The University of Tokyo</contributor>
<contributor>Institute of Geosciences [Shizuoka] ; University of Shizuoka</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>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-00412594</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00412594</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00412594</source>
<source>Earth and Planetary Science Letters, Elsevier, 2008, 272 (3-4), pp.747-757. 〈10.1016/j.epsl.2008.06.014〉</source>
<identifier>DOI : 10.1016/j.epsl.2008.06.014</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2008.06.014</relation>
<language>en</language>
<subject lang=en>seismic anisotropy</subject>
<subject lang=en>subduction</subject>
<subject lang=en>mantle wedge</subject>
<subject lang=en>hydration</subject>
<subject lang=en>B-type olivine fabric</subject>
<subject lang=en>dunite</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>B-type olivine fabrics are pervasive within highly depleted dunites of the small-sized Imono peridotite body located within the subduction-type Sanbagawa metamorphic belt of the southwest Japan arc. The dunites contain various microstructures, ranging from porphyroclastic to fine-grained intensely sheared textures. The Mg/(Mg+Fe) atomic ratios (Fo number) of olivine within these dunites are consistently around 0.9, as are the Cr/(Cr+Al) atomic ratios (Cr number) of chromian spinel, suggesting their evolution from a highly depleted magma (boninite). These data provide strong thermal constraints on the formation of the highly depleted dunites,as their formation requires hot, hydrous, shallow mantle (> 1250 degrees C at < 30 km depth) in the mantle wedge. Because the Sanbagawa metamorphic belt finally entrained these peridotites during progressive retrogression, B-type olivine fabrics probably developed in the fore-arc side of the subduction zone, above or along the subducting slab, possibly in association with dehydration fluids derived from the slab. The previously documented small magnitude of S-wave splitting can be explained by the seismic properties of B-type peridotites within an anisotropic layer of approximately several kilometers in thickness, oriented by flow parallel to the subducting slab, under maximum temperatures of 880-1030 degrees C depending on the flow stress. These findings indicate that such a B-type layer could constitute a dominant source of seismic S- and P-wave anisotropy in mantle wedge regions. (c) 2008 Elsevier B.V. All rights reserved.</description>
<date>2008</date>
</dc>
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