Ophiolite in the eastern Central Asian Orogenic Belt, NE China

Northeast China is located in the eastern segment of the Central Asian Orogenic Belt, which underwent complicated accretionary orogenic processes. It has become hot topics to understand the basement features and their collision boundary locations and timing of the micro-massifs. Based on the research progresses in the recent years, we recognized Erguna Massif, Xing' an Accretionary Terrane, Songnen-Xilinhot Massif and Jiamusi Massif in the NE China. The ages, geochemistry and distributions of the ophiolites/ophiolitic complexes as the markers of the suture zones have been reviewed according to the updated data, the tectonic setting and subduction-accretion processes have been discussed. The accretionary orogeny was related to Paleo-Asian Ocean, Paleo-Pacific Ocean and Pan-Ocean. The subduction-accretion processes include the evolutions of the Early Ordovician-Late Triassic main branch of Paleo-Asian Ocean, Neoproterozoic-Late Cambrian Xinlin-Xiguitu branch ocean, the Early Cambrian-Late Carboniferous Nenjiang branch ocean and Neoproterozoic Heilongjiang branch ocean and Late Permian-Middle Jurassic Mudanjiang branch ocean. In the end of Early Carboniferous to the beginning of Late Carboniferous all the branch oceans were closed, an amalgamated block in the NE China had been formed. In the Late Permian-Early Triassic, the main Paleo-Asian Ocean basin was closed in scissor style from west to east along Solonker-Xar Moron-Changchun-Yanji suture zone, and the amalgamated block was connected to the North China Plate. The NE China started to be subducted and accreted by Paleo-Pacific Ocean in the Late Triassic-Early Jurassic.