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Petrography and Petrochemistry or Rocks in Zingyaik Area, Paung Township, Mon State
- The Zingyaik area is located at Paung Township, Mon State. It lies between north latitude l6º9'00" to 16º46'00" and east longitude 97º23'00" to 97º300'00". It is situated at about 22.5km (l4miles) the southeastern part of Thaton and 28.9km (18miles) northeastern part of Mawlamyine in Mon State. The area coverage is at about 134.4 square kilometers. The study area is made up of metasedimentary rocks, meta-igneous rock am igneous rocks. Metasedirnentry rocks are quartzite and phyllite. Meta- igneous rock is biotite (augen) gneiss. Igneous rocks are foliated biotite granite. (porphyritic) biotite granite and biotite microgranite. Generally, foliation directions of metamorphic rocks of the study area are generally NNW-SSE with average dip amount is between 45º and75º. Biotite (augen) gneiss formed at the transitional contact with foliated biotite granite. The probable age of metamorphism of metasedirnentry rocks is Early Carboniferous to Early Permian. In addition, the age of metaigneous rocks are probable Early Oligocene.The igneousrocks of the study area belong to acid clan, high K· calc alkaline series, peraluminous nature. Granite field, and S type with magmatic in origin The S type granitoid rocks may be originated from the crustal source in origin. The liquidus temperature for foliated biotite granite, (poqilyritic) biotite granite and biotite microgranite are 680ºC, 695ºC and 71OºC respectively. According to depth Temperature relation diagram, the probable depth of igneous rocks is between 22 and 24km. So, the depth of emplacement may be estimated at the transition between the Mesozone to Catazone. The tectonic environments for the granitoid rocks of the study area fall within Continental Collision Granitoid (CCG) and Continental Arc Granitoid (CAG) field, genetically, the later phase of the subduction related magmatism .
Day Wa Aung
Aung Aung Zar Ni
Khaing Khaing Thet Lwin
- Journal of the Asia Research Centre