Abstract

• The present research area was conducted at Zaw Pho Kyin Mine situating about 70.84 km east of Dawei, Tanintharyi Region. The total area coverage is about 32 km2 . Two major rock units, the metasedimentary rocks of Mergui Group and biotite granite are widely exposed. Granite is well exposed in the central part of the study area. Granite is highly weathered at Zaw Pho Kyin prospect in which the wolframite bearing quartz veins are intruded. The texture of the biotite granite in the Dawei district varies from coarse to medium-grained, consists of quartz, microcline, partly sericitized, plagioclase, biotite and minor muscovite. Geochemically, granitic rocks show high - K calc-alkaline series and are predominantly peraluminous. In Harker’s variation diagram, Al2O3, TiO2, FeO, CaO, Na2O, K2O and MnO are negatively correlated with SiO2 whereas MgO and P2O5 are positively correlated with SiO2. Plots of Harker’s variation diagrams, selected trace elements of W, Sn, Mo, Ba, Rb, Y, Ni and Zn are negatively correlated with SiO2 and Zr is positively correlated with SiO2. Standard CIPW normative corundum ranges from 1.826 to 6.809 and A/CNK ratio is > 1.1, indicated S-type granite and peraluminous granite from Zaw Pho Kyin mine area.