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
Hu Junjie1, Li Qi1, Fang Nianqiao1, Yang Jingyi2, Huang Jing1, Chen Ruoyu1
1 School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083 2 School of Earth and Space Science, Peking University, Beijing 100871
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 LaN/YbN indicate that the differentiation is slight. The Ceanom,Ce/Ce* and Eu/Eu* ratios suggest that the sedimentary rocks of Zhanjin Formation formed in a certain depth of shallow water. The Lan/Ybn 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.
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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