Abstract
The Circum-Izu Massif peridotite, central Japan, is an upper mantle fragment of the Shikoku Basin, a back-arc or an inter-arc basin of the Izu-Bonin arc system. The Circum-Izu Massif peridotite had been uplifted along a transcurrent plate boundary during the opening of the Shikoku Basin. The Circum-Izu Masslf peridotite was investigated in order to understand petrological characteristics of the upper mantle beneath the back-arc (or inter-arc) basin. It is characterized by harzburgite or clinopyroxene-poor lherzolite (Fo90-92) frequently with calcic plagioclase (An88-96). Chromian spinel (Cr/(Cr + Al) ratio, 0.4-0.6) often has orbicular primary inclusions of pargasite + K- (or Na-) phlogopite + orthopyroxene.
The back-arc mantle peridotite resembles some refractory ocean-floor peridotite but generally has lower-Ti mineral chemistry. Unlike the ocean-floor peridotite the back-arc mantle peridotite could have primary hydrous minerals.
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Arai, S. (1991). The Circum-Izu Massif Peridotite, Central Japan, as Back-Arc Mantle Fragments of the Izu-Bonin Arc System. In: Peters, T., Nicolas, A., Coleman, R.G. (eds) Ophiolite Genesis and Evolution of the Oceanic Lithosphere. Petrology and Structural Geology, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3358-6_40
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