Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (2): 94-114.DOI: 10.13745/j.esf.sf.2022.2.10

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Research progress on the subduction-accretion complex: Reconstruction of the tectonic framework of the Great Xing’an Range

YANG Xiaoping(), ZHONG Hui*(), YANG Yajun, JIANG Bing, QIAN Cheng, MA Yongfei, ZHANG Chao   

  1. Shenyang Center of China Geological Survey, Shenyang 110034, China
  • Received:2021-08-19 Revised:2021-10-13 Online:2022-03-25 Published:2022-03-31
  • Contact: ZHONG Hui


The Great Xing’an Range region, which experienced the closure of the Paleo-Asian Ocean during the Paleozoic, has developed numerous arc-basin systems and ophiolite belts. In this contribution, based on the concept of “ocean plate geology”, various tectonic units including subduction-accretion complexes, ancient block relicts, island arcs, forearc basins and back-arc basins were identified based on 1: 1 000 000 scale geological mapping and geological survey of the region. Among the tectonic units, there are 9 subduction-accretion complex belts, of which 3 were identified for the first time. The subduction-accretion complex belts, structurally equivalent to 5 suture zones, divide the tectonic blocks and magmatic arcs of the region. These suture zones mainly orient in the northeast direction, and their formation age becomes younger southward, from Early Ordovician to Middle and Late Permian, indicating the subduction initiates in the northern Erguna region then retreats southward in a prolonged subduction-accretion process. Plenty of new continental crust are formed, followed by southward accretion. Not until the Early to Middle Triassic, the Central Asian Orogenic Belt and North China Craton are amalgamated along the Xar Moron suture zone. By reconstructing the Paleozoic tectonic framework of the Great Xing’an Range region, this study helps to advance our understanding of the oceanic-continental transition in the eastern Paleo-Asian Ocean.

Key words: Great Xing’an Rang, Paleozoic era, tectonic framwork, Oceanic plate geology, subduction accretionary complex

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