A PRELIMINARY STUDY ON THE WEIXI-JINGHONG FAULT DEPRESSION ZONE
According to the geophysical data and geological comprehensive analysis,the nearly south-north Weixi-Wuliangshan-Jinghong geological bolck on the west side of Lanping-Simao depression zone is characterized by a fault depression zone.From Devonian,the mantle began to rise and form a lifting zone.And a east-west extension with local volcanism took place in the Earth crust.From Carboniferous to Triassic,there were a great amount of volcanic eruptions mainly intermediate-acidic in it,which was closed in Early Jurassic and with a thick clastic sediment of Mesozoic and Cenozoic.And many large or medium ore deposits were developed with the formation of this fault depression zone.