Evolution of low-Al orthopyroxene in the Horoman peridotite, Japan: an unusual indicator of metasomatizing fluids

Abstract

Unusually alumina-poor orthopyroxene is found in a spinel peridolite from the Horoman Peridotite Complex, Japan. Al2O3, Cr2O3 and CaO contents in the low-Al orthopyroxene (named Low-Al OPX hereafter) are <0·25 wt%, <0·04 wt% and <0·3 wt%, respectively, Show more