1979•The Journal of the Japanese Association of Mineralogists Petrologists and Economic GeologistsOpen access

Notes on petrography and rock-forming mineralogy (6) Glaucophane in the Iratsu amphibolite in the Sanbagawa belt in central Shikoku.

Masaki Enami, Osamu Iwata, Shohei Banno

Abstract

Glaucophane-bearing metagabbros occur in the Iratsu albite-epidote amphibolite mass of the Sanbagawa metamorphic belt in central Shikoku. Typical mineral assemblage of glaucophane-bearing rocks is garnet+omphacite+glaucophane+epidote+subcalcic amphiboles+paragonite+albite. Two stages of equilibration are recognized, the first stage for garnet+omphacite+Fe3+-rich epidote and the second stage for glaucophane+subcalcic amphibole+chlorite+Al-rich epidote. The glaucophane in the Iratsu mass has higher content of Na2Mg3Al2Si8O22(OH)2 component than any of alkali amphiboles so far known from the Sanbagawa metamorphic belt.

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Key concepts: Glaucophane, Epidote, Amphibole, Omphacite, Lawsonite, Geology, Geochemistry, Metamorphic rock