内蒙古达茂旗胡吉尔特晚泥盆世蛇绿岩的发现及其地质意义

在内蒙古胡吉尔特一带进行1∶50 000区域地质调查，发现超基性岩、堆积杂岩、辉绿岩墙群及基性枕状熔岩夹大洋放射虫硅泥质岩组合，呈现典型的蛇绿岩特征，其地球化学资料显示为大洋中脊环境.锆石U-Pb年龄为371.0±5.3 Ma，为晚泥盆世.表明这一地区晚古生代有洋壳存在，是古亚洲洋的一部分，可能为西伯利亚板块与中朝板块之间多岛洋古地理格局中洋盆的一支，并非位于中朝板块内部，推测中朝板块的北缘位于胡吉尔特一带之南. 

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.