Progress of serpentinization triggered by silica addition: Evidence from sequential change of serpentinite textures in Iwanai-dake ultramafic body

Abstract

Petrography and mineral chemistry of serpentinite samples from Iwanai-dake ultramafic body (Kamuikotan, Hokkaido) revealed that serpentinization proceeded via two-stage reactions, in which silica supply from serpentinization of orthopyroxene triggered the formation of magnetite during the second stage.