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DEFORMED AND METAMORPHIC FEATURES OF DASHUIGOU MICROLITHON,SHIMIAN IN THE WESTERN MARGIN OF YANGTZE LANDMASS

Guo Jianqiang and You Zaiping (Panxi Geological Party, SBGEEMR) Wang Dake (Sichuan Bureau of Geology and Exploration and Exploitation of Mineral Resources)  
Bourdary faults of Dashuigou microlithon are ductile shear zones being of thrusting and nap ping in character. The microlithon thrust upon Yangtze landmass during the Mesozoic collisional orogeny. It underwent the Late Permian rifting metamorphism, especially, late Late Triassic Middle Jurassic detachment-compressive dynamothermal metamorphism and Late Jurassic thermal dome contact metamorphism. They laid a foundation of Dashuigou thermal dome associated with tellurium ore deposit- Dashuigou thermal dome is a magmatic one which underwent collision thickening of crust, shear heating and magmatic diapir.
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