Acidic metasomatic rocks

Overview

Metasomatic rocks by acidic hydrothermal fluid associated with rhyolitic to dacitic magma activities. Protoliths are rhyolitic to dacitic volcanic rocks, granitoids, and sedimentary rocks. Acidic metasomatic rocks are observed near island arc volcanoes on volcanic fronts. Acidic metasomatic rocks are frequently associated with hot springs near volcanoes.

Acidic metasomatic facies series

Halloysite zone > Kaolinite zone > Minamiite-Alunite zone > Pyrophyllite zone