Solid Earth Discussions www.solid-earth-discuss.net 1869-9537 4 1 2012 10.5194/sed-4-203-2012 http://www.solid-earth-discuss.net/4/203/2012/ http://www.solid-earth-discuss.net/4/203/2012/sed-4-203-2012.html http://www.solid-earth-discuss.net/4/203/2012/sed-4-203-2012.pdf 203 239 2012-01-27 Possibility of titanium transportation within a mantle wedge: formation process of titanoclinohumite in Fujiwara dunite in Sanbagawa belt, Japan S. Ishimaru ishimaru@sci.kumamoto-u.ac.jp S. Arai Guraduate School of Science and Technology, Department of Earth and Environmental Sciences, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860&ndash;8555, Japan Earth Science Course, School of Natural System, College of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920&ndash;1192, Japan Titinoclinohumite-bearing dunites from Fujiwara, the Sanbagawa metamorphic belt of high-pressure type, Japan, were described to examine the possibility of Ti mobility during metasomatism within the mantle wedge. The Fujiwara dunite body and surrounding high-pressure Sanbagawa schists possibly form a subduction complex, and the dunites are a good analogue to the mantle wedge overlying the slab. The Fujiwara dunites are of deserpentinization origin; the deserpentinized olivine is high in Fo (up to 96) and low in NiO (0.2 to 0.3 wt %), and contains magnetite inclusions. Titanoclinohumites are associated with the deserpentinized olivine, as lamellar intergrowth or veinlets, up to 1 cm in width. Other metamorphic minerals include antigorite, brucite, chlorite, ilmenite, perovskite, Ti-rich ludwigite, and carbonates. The protolith of the Fujiwara dunite was partially serpentinized cumulative dunites from intra-plate magma, containing relatively low-Fo (85 to 86) olivines and TiO₂-rich (up to 3 wt %) chromian spinels. The metamorphic olivines and titanoclinohumites contain micro-inclusions of methane (CH₄) with or without serpentine and brucite. The source of Ti for titanoclinohumite was possibly the Ti-rich chromian spinel, but Ti was mobile through hydrocarbon-rich fluids, which were activated during the metamorphism. 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