Abstract

• Mogok Belt is the one of metallogenic province in Myanmar. This belt has two sub-belts such as Mogok Metamorphic Belt and Slate Belt. Along these two sub-belts, gold deposits are difference characteristics and features. Zayetkwin-Kwinthonse gold deposit from Mogok Metamorphic Belt is mainly hosted in marble unit as fracture-filling vein with silicification, sericitization and propylitization alteration. Gold occurs in quartz vein as disseminated specks in pyrite, sphalerite and galena. The diagnostic quartz vein textures, coexistence of vapor-rich and liquid-rich fluid inclusions and the presence of adularia and calcite in the vein mineralogy are distinct characteristics features. In place, fluid inclusion homogenization temperature ‘Th’ and salinity from Zayetkwin-Kwinthonse deposit are 159-315°C and 0.88-12.51 wt%NaCl equivalent respectively. Alternatively, Phayaung Taung gold deposit from Slate Belt is hosted in phyllite, schist and quartzite. The mineralization is associated with stockwork quartz vein system. Wall-rocks silicic alteration by cryptocrystalline quartz or amorphous silica is dominant; phyllic alteration is expressed by sericite, quartz, chlorite and pyrite with disseminated hematite. Gold occurs as small spots in tourmaline-quartz vein and sulfide bearing quartz vein. It is associated with pyrite and chalcopyrite as well as Au-Ag-Bi-Te ore assemblages. Fluid inclusion homogenization ‘Th’ in quartz fall within the range of 234-426°C and salinities ranging from 0.35-8.41 wt%NaCl equivalent. In fact, Zayetkwin-Kwinthonse gold deposit represents the epithermal expression whereas Phayaung Taung gold deposit shows typical mesothermal characters.