Findings and Its Geological Significance of the Upper Devonian Ophiolite in Hujierte Area,Damao County,Inner Mongolia,China
Assemblages of the Upper Devonian ultrabasic rock,cumlative complex,diabase-dike swarm as well as basic pillow lava nipping radiolarian Si-sargillaceous rocks are discovered in Hujierte area,Inner Mongolia,China.They are typical ophiolite,which geochemical compositions accord with the characteristics of MORB.The age of 371.0±5.3 Ma using zircon U-Pb geologic dating method shows that there is the Upper Paleozoic era oceanic crust in this area,being a part of the Paleo-Asiatic Ocean,it is possibly a branch of ocean basin in archipelago paleogeographic pattern between the Siberian plate and the Sino-Korean plate,not inner the Sino-Korean plate,a northern part of the Sino-Korean plate should be on the south of Hujierte at the least.