Abstract

• The study area occupies the Chaungzon Township, Mon State. It is situated between Latitude 16˚ 15′ 00″ to 16˚ 30′ 00″ N and Longitude 97˚ 30′ 00″ to 97˚ 35′ 00″ E, one-inch topographic map No.94H/11. It covers approximately 6.56 km2 . It is located in the western part of Shan-Tanintharyi block. The area was composed of low to medium grade metamorphic rocks which were intruded by igneous rocks. The metamorphic rocks are garnet-biotite gneiss, graphite-sillimanite-mica schist and calc-silicate rock, quartz-sericite schist and quartzite, banded quartzite and mica schist, micaceous quartzite and quartzite and slate, phyllite and quartzite interbedded. Slaty, phyllitic, schistose, gneissose and granoblastic texture are observed in the area. Mineralogical and textural features indicate that all metamorphic rocks had undergone regional and contact metamorphisms. In general, the grade of metamorphism increases from east to west. On the basis of the mineral assemblages, the metamorphic rocks are greenschist facies, amphibolite facies and hornblende hornfels facies. The relative age of metamorphic rocks was probably Post Carboniferous.