藏北羌塘盆地中央隆起带下二叠统展金组沉积岩稀土元素地球化学特征及其地质意义

doi:10.7605/gdlxb.2014.06.073

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Abstract There is a hot debate on the Neopaleozoic tectonic evolution history of central uplift zone of Qiangtang Basin,northern Tibet Plateau. The clastic sedimentary strata,with great geological significance for the research on palaeogeography and tectonic setting of study area,were discovered in the Lower Permian Zhanjin Formation of the Well Qiangzi 5 in Jiaomuri area of central uplift zone. Based on the rare earth element(REE)geochemical analysis of 17 samples of silty mudstone and muddy siltstone,the data show that the ΣREE is entirely high,and the ratios of ΣLREE/ΣHREE and La_N/Yb_N indicate that the differentiation is slight. The Ce_anom,Ce/Ce^* and Eu/Eu^* ratios suggest that the sedimentary rocks of Zhanjin Formation formed in a certain depth of shallow water. The La_n/Yb_n values decrease gradually from bottom to top in the Well Qiangzi 5,which reflects that the sedimentary rate at the bottom sequence is lower than at the upper sequence. The REE geochemical characteristics and relative parameters imply that the sedimentary rocks of Zhanjin Formation were mainly derived from the basalt and sedimentary rocks. The critical characteristic parameters,as well as the La-Th-Sc tectonic discrimination diagram imply an arc-like tectonic setting for the depositional basin of Zhanjin Formation.

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	Articles by authors
	Hu Junjie
	Li Qi
	Fang Nianqiao
	Yang Jingyi
	Huang Jing
	Chen Ruoyu

Key words： Qiangtang Basin central uplift zone Permian Zhanjin Formation REE characteristics geochemistry

Received: 09 April 2014 Published: 01 December 2014

ZTFLH:

P595

About author: Hu Junjie,born in 1987,is a Ph.D. candidate in School of Ocean Sciences,China University of Geosciences(Beijing). Now he is mainly engaged in researches on marine geology,sedimentology and carbonate reservoir geology. E-mail: howimet@foxmail.com.
About the corresponding author Li Qi,born in 1969,is an associate professor of China University of Geosciences(Beijing). Now he is mainly engaged in researches on marine geology and sedimentary basin analysis. E-mail: liqi@cugb.edu.cn

Cite this article:

Hu Junjie,Li Qi,Fang Nianqiao et al. REE geochemical characteristics and geological significance of sedimentary rocks of the Lower Permian Zhanjin Formation in central uplift zone of Qiangtang Basin, northern Tibet Plateau[J]. JOPC, 2014, 16(6): 926-934.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2014.06.073 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2014/V16/I6/926

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