Geochemistry characteristics of the Low Permian sedimentary rocks from central uplift zone, Qiangtang Basin, Tibet: insights into source-area weathering, provenance, recycling, and tectonic setting

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• 作者：Junjie Hu ; Qi Li ; Nianqiao Fang ; Jingyi Yang…
• 关键词：Geochemistry ; Qiangtang Basin ; Central uplift zone ; Zhanjin Formation ; Provenance ; Tectonic setting
• 刊名：Arabian Journal of Geosciences
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：8
• 期：8
• 页码：5373-5388
• 全文大小：2,779 KB
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  Liang X, W
• 作者单位：Junjie Hu (1)
  Qi Li (1)
  Nianqiao Fang (1)
  Jingyi Yang (2)
  Dongsheng Ge (1)
  
  1. School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
  2. School of Earth and Space Science, Peking University, Beijing, 100871, China
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

There is hot debate on contrasting hypotheses on properties of the central uplift zone, Qiangtang Basin, northern Tibet Plateau. The Qiangzi 5 Well in the Jiaomuri area, central uplift zone of northern Tibet Plateau, encounters a fine-clastic sedimentary-volcanic breccia-carbonate rock series of the Low Permian Zhanjin Formation. Study on the series is of great significance for investigating the Permian geotectonic setting of the central uplift zone. Geochemistry information of these rocks has been identified by major, trace, and rare earth element (REE) analysis. Samples-Al₂O₃/SiO₂ ratios range from 0.28 to 0.41, chemical index of alteration is less than 75, respectively, indicating that the source rocks are fresh and of low maturity, and are suffering from weak chemical weathering and sedimentary recycling. Samples have features such as low-medium light rare earth element (LREE) fractionation ((La/Sm) N--.88-.37) and a relatively flat heavy REE (HREE) ((Gd/Yb) N--.07-.56) pattern and most of them do not show any negative Eu anomaly. The samples have an Al₂O₃/TiO₂ ration of <14, La/Sc of <2, and Co/Th in the range of 1-0. The F1-F2 and F3-F4 diagrams, etc. show that the source rocks of Zhanjin Formation’s sedimentary rocks are arc-like basalts and andesites, and proves that Zhanjin Formation sedimentary rocks might have been formed in the island arcs setting, most probably back-arc basin. Keywords Geochemistry Qiangtang Basin Central uplift zone Zhanjin Formation Provenance Tectonic setting