Late Paleozoic tectonic evolution in Northeast China
Late Paleozoic tectonic evolution in Northeast China
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发表时间：
2010
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通讯作者：
Z. Xing
中科院分区：
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作者：
Z. Xing
Northeast China area consists of several micro-continental blocks,such as Jiamusi Block in the southeast,Xing'an-Songliao Block in the middle,and Erguna blocks in the northwest.Studies of the suture zones between the blocks indicate that the amalgamation of these blocks ended before Late Paleozoic and formed a big continental block,i.e.,Jia-Meng Block.From Late Paleozoic the cover sequences started to develop and formed a Late Paleozoic continental margin cover sequence.The tectonic setting of the southern margin of the Jia-Meng Block was an active continental margin during early Paleozoic.The Paleo-Asian ocean plate broke down during the northward subduction around 320 Ma,and formed a volcanic arc.Meanwhile the Hegenshan back-arc basin ocean was opened.The continuous northward subduction resulted in the arc-continent collision,and the Hegenshan Ocean was closed at 280 Ma.The tectonic setting changed from active margin to passive margin.Finally the Paleo-Asian ocean was closed at the end of Late Permian,and the whole area became an intracontinental terrestrial setting.
