Geological Settings of Gold Districts in Myanmar

摘要

The main tectonic elements in Myanmar are a late Mesozoic and Cenozoic magmatic arc system in the west. repated in northern Myanmar by more than 300 km of dextral movement on the Sagaing Fault, and the back-arc continental region affected by early and late Measozoic orogenies, in the east. Historically most loade gold production has been from laterst Creataceous high-grade mesothermal veins and derived placers in the Wuntho and Tagaung-Myitkyina segments of the magmatic arc. Placer deposits in the Ayerwaddy River north of Myitkyina are curently worked by more than 100-bucket dredges. South of Wuntho, the magmatic arc and Pegu Yoma fold belt host epithermal gold with associated As, Sb and Zn in mid-Tertiary marine sediments.