Clintonite-bearing metasomatic veins from the Kasuga contact aureole, Gifu Prefecture

Abstract

Clintonite-bearing metasomatic veins were found from the contact aureole of the Kaizukiyama granite, Kasuga area, Japan. The veins are symmetrically zoned with the following sequence of mineral assemblages from the host rock (dolomitic marble) to the vein center; Zone1: diopside + forsterite + calcite, Zone2: clintonite + spinel + pargasite + diopside, and Zone3: grossular + diopside + clinozoisite + anorthite + adularia + calcite. Zone1 and Zone2 were formed essentially by SiO₂ metasomatism and Al₂O₃ metasomatism, respectively.