2026-05-30T23:45:10Z https://meral.edu.mm/oai

oai:meral.edu.mm:recid/00012745 2026-05-24T00:55:00Z 1704332180226 1704332180226:1704447094819

Petrological Interpretation Based on Petrographical Analysis of Al2SiO5 Polymorphs Formation in the Shwe-U-Min Taung and Shantaung-U-Yinswe Range, Kyaukse Township Yadanar Win Swe Kyi Kyi Linn Khin Pyone The research area is located approximately 8 km SSE of Kyaukse, Mandalay Region. It is situated in the middle segment of Mogok Metamorphic Belt. The rock units exposed in the study area are mainly metasedimentary rocks. The whole area is made up of calcareous group and pelitic-psammitic group of andalusite-bearing phyllite, andalusite marble, chiastolite-garnet-staurolite-mica schist, garnet-mica schist, garnet-staurolite-mica schist, biotite-sillimanite schist and kyanite-bearing quartzite. These rocks are widely distributed in Shwe-U-Min Taung and Shantaung-U-Yinswe range. The research area is indeed a mineralogist’s paradise. It is noteworthy that almost all better known metamorphic minerals occur in an area. In order to study the salient mineralogical features and mineral assemblages of the metamorphic rocks in the study area, about 100 thin sections are prepared from representative samples. Many of these metamorphic minerals occur as porphyroblasts. The common minerals noted are andalusite, garnet, staurolite, chiastolite, sillimanite, kyanite and biotite. It is noticeable that polymorphs of Al2SiO5, namely andalusite, kyanite and sillimanite oc+cur altogether in such narrow area. Petrographic investigation on the rock assemblage of the study area reveals that the metamorphic grade of these rocks range from medium-grade of greenschist facies to higher grade of upper amphibolite facies. Petrogenetic interpretation on this mineral assemblage is attempted on the basis of petrographic criteria. Taking into account the various metamorphic conditions, distinct mineral assemblages form under different grades and pressure. 2025-03-03 https://meral.edu.mm/records/12745