对雅鲁藏布江缝合带嘎学组和泽当组的新认识

doi:10.19388/j.zgdzdc.2020.02.09

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Abstract On the basis of the 1:50 000 regional geological survey, the authors comprehensively studied Gaxue Formation and Zedang Formation in North Yalu Tsangpo Suture Zone, and compared their petrogeochemical parameters and tectonic environment with ophiolite. Combined with paleontological and high-precision isotope dating analysis, it is preliminarily considered that Gaxue Formation, Zedang Formation and ophiolite are products of different genetic types. Gaxue Formation and Zedang Formation were formed in the intra-oceanic arc tectonic environment from late Jurassic to early Cretaceous, and belonged to the front arc basalt (FAB type) which was the standard oceanic plate stratigraphic sequence. In the late subduction and collision process, the main body of Gaxue Formation and Zedang Formation was transformed into melange or existed in the melange belt in the form of a broken clip (block), mainly as the structure styles in subduction and accretionary complex zones. This understanding is of great geological tectonic significance for the rational restoration and establishment of the northern belt oceanic plate stratigraphic sequence of Yalu Tsangpo Suture Zone.

Key words： Yalu Tsangpo Suture Zone Gaxue Formation Zedang Formation intra-oceanic subduction front arc basalts (FAB type) ocean plate stratigraphy

Received: 03 January 2019

ZTFLH:	P534.52
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	Articles by authors
	ZHANG Xinquan
	WANG Jingui
	ZHANG Zhenli
	ZHUAN Shaopeng
	ZHANG Liguo
	CHENG Zhou
	DENG Ke
	HE Jiaoyue

Cite this article:

ZHANG Xinquan,WANG Jingui,ZHANG Zhenli, et al. New recognition of Gaxue Formation and Zedang Formation in Yalu Tsangpo Suture Zone[J]. , 2020, 7(2): 72-80.

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http://www.zgdzdcbjb.com/EN/10.19388/j.zgdzdc.2020.02.09 OR http://www.zgdzdcbjb.com/EN/Y2020/V7/I2/72

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