Qi-Qin Accretionary Belt in Central China Orogen: accretion by trench jam of oceanic plateau and formation of intra-oceanic arc in the Early Paleozoic Qin-Qi-Kun Ocean

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2017,（15）
• 页码范围: 1035-1038
• 页数: 4页
• 语种: 英文

摘要

Most orogenic belts have experienced a complex accretionary process with multiple episodes of seafloor subduction and trench retreat.This accretionary process is important in continental development and growth [1,2]. Three giant orogens extend in China,e.g.,the Central Asian Orogen in the north,the Central China Orogen in the middle and the Himalayan Orogen in the southwest.They are keys for the formation of the Eurasian continent (Fig.1a).The Central China Orogen is one of the three major orogens in China [3] and has experienced a long and complicated orogenic history [4-6].It consists of the Qinling-Tongbei-Dabie orogenic belt in the east,the West Qinling orogenic belt,in the middle and Qilian and Kunlun orogens in the middle-west and the West Kunlun orogen in the west (Fig.la).The Qi-Qin Accretionary Belt (QQAB) extends discontinuously from the South Qilian Accretionary Belt in the northwest to the Tianshui-Wushan Accretionary Belt (TWAB),and further to the East Qinling Orogen in the southeast (Fig.1b) for ～2000 km,which stretches across much of the Central China Orogen (CCO).This giant accretionary belt was formed during the evolution and closure of the Qin-Qi-Kun Ocean (Proto-Tethys Ocean (?) or Paleo Pacific Ocean (?)),which played important roles in the amalgamation of continental China and Pangea [7].