Abstract

• The Mogaunggyi area is situated in Singu Township, Mandalay Region and forms the southern continuation of highly deformed Mogok Metamorphic Belt. Based on the petrological, mineralogical and field criteria, metamorphic rocks in the study area comprise metapelites (garnet - biotite gneiss), metacarbonate (varieties of marbles and calc-silicates) and skarn. There are two main types of metamorphism affecting in this area; regional metamorphism and contact metamorphism. The metamorphic mineral such as sillimanite, garnet, diopside and forsterite, phlogopite and spinel are the evidence of regional metamorphism and belongs to the almandineamphibolite facies with 0.4-0.8GPa and 550C to 750C estimated pressure and temperature respectively. The regional metamorphism was later superimposed by contact metamorphism by the intrusions of granite, biotitemicrogranite and pegmatite. Hence, the skarn rocks occurred at the marginal part. They belong to the pyroxene-hornfelsfacies and estimated pressure and temperature are between 0.1-0.2GPa and 600C - 700C respectively. The protolith age of the metamorphic rocks in the study area may range from Precambrian to Late Paleozoic, and the time of metamorphism of the study area is suggested to be from Oligocene to Middle Miocene.