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            <title xml:lang="en">B-type olivine fabrics developed in the fore-arc side of the mantle wedge along a subducting slab</title>
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            <idno type="halRefHtml">&lt;i&gt;Earth and Planetary Science Letters&lt;/i&gt;, 2008, 272 (3-4), pp.747-757. &lt;a target="_blank" href="https://dx.doi.org/10.1016/j.epsl.2008.06.014"&gt;&amp;#x27E8;10.1016/j.epsl.2008.06.014&amp;#x27E9;&lt;/a&gt;</idno>
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                <title xml:lang="en">B-type olivine fabrics developed in the fore-arc side of the mantle wedge along a subducting slab</title>
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                <term xml:lang="en">seismic anisotropy</term>
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                <term xml:lang="en">hydration</term>
                <term xml:lang="en">mantle wedge</term>
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              <p>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 (&gt; 1250 degrees C at &lt; 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.</p>
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