Role of micropores, mass transfer and reaction rate in hydrothermal alteration process of plagioclase in a granite

Abstract

This study presents the plagioclase alteration process with a focus on the role of micropores, mass transfer and reaction rate in the Toki granitic pluton, central Japan. The plagioclase alteration process involves an albitization, K-feldspathization and the formation of illite, calcite, fluorite and epidote. Such secondary minerals of hydrothermal origin in plagioclase within granitic rocks record the chemical characteristics of the hydrothermal fluid.