Occurrence and metamorphic process of Low-pressure type metamorphic rocks in the Mt. Sangun area

Abstract

The low-pressure type metamorphic rocks occur in the eastern foot of Mt. Sangun-san. The metamorphic rocks consist mainly of fine amphibolite and biotite gneiss with small amounts of metamorphosed chert and crystalline limestone. The inferred peak conditions show 620-720 degree-C and 0.4-0.5 GPa, and the metamorphic process could suggest a hairpin-shaped clockwise trajectory. The lithology and metamorphic process are similar to those of metamorphic rocks from the Sefuri Mountains in northwest Kyushu.