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Petrogenetic Interpretation Based on Petrographic Characters of Pelitic Metamorphic Rocks exposed in Pinwe-Mawlu Area, Indaw Township, Sagaing Region
- The study area lies in Indaw Township, northeastern part of Sagaing Region. It is situated between Latitude 24° 20ʹ to 24° 35ʹ N and Longitude 96° 10ʹ to 96° 20ʹ E. The present study area is made up chiefly of metamorphic rocks and minor sedimentary rocks. They occupy the entire bulk of the Katha-Gangaw Range. Metamorphic rocks are low to medium grade and mainly exposed in the central and eastern part of the area. Because of the thick soil cover and dense growth of plants, rock units are poorly exposed. Good exposures can be seen along the stream sections and some topmost parts of the hills. The pelitic metamorphic rocks which composed in the study area may be lithologically divided into eight units. They are (i) chlorite schist (ii) biotite schist (iii) muscovite schist (iv) garnet biotite schist (v) garnet muscovite schist (vi) paragonite garnet schist (vii) sillimanite garnet staurolite schist and (viii) garnet kyanite (sillimanite) muscovite schist. Garnet biotite schist is the most abundant metamorphic rock unit and this unit occupies the central and eastern part of the area. On the basic of petrographic analysis, eight representative mineral assemblages are recognized. Petrographic investigation on this rock assemblage reveals that the metamorphic grade of these rocks range from low grade of lower greenschist facies to higher grade of upper amphibolite facies. The sequence of metamorphic facies encountered in the study area could be compared to the medium P/T (intermediate pressure and intermediate temperature) facies series of Barrovian Type.
Aung Khin Soe
- Monywa University Research Journal