Discoveries of ultrabasic rocks and accumulative complex at Heletaolegai, Damaolianhe County in Inner Mongolia, and its geological significance

摘要

Combination of ultrabasic rocks and accumulative complex in Neodevonian was discovered at Heletaolegai, southern Mandulasumu Damaolianhe County in Inner Mongolia. The combination is the main part of ophiolite in the research area, and the geochemical data of ophiolite manifest its sedimentary environment is oceanic ridge. The oceanic crust existed in this area in Neodevonian, and the area is a part of Paleo-Asian ocean. It was possible to be a branch of basin in multiple oceanic islands paleogeographic condition between Siberian plate and Sino-Korea plate, and it was not located within Sino-Korea plate. The north margin of Sino-Korea plate should be located in south of Heletaolegai.