Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (4): 1039-1052.doi: 10.13278/j.cnki.jjuese.20180018

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Tectonic Setting of Lower-Middle Jurassic Longshan Formation in Taxkorgan Area, West Kunlun

Zeng Zhongcheng1,2, Bian Xiaowei1,2, Zhang Ruoyu2, Kong Wennian1,2, Chen Ning2, Zhao Duanchang1,2, Zhao Jianglin1,2   

  1. 1. Shaanxi Mineral Resources and Geological Survey, Xi'an 710068, China;
    2. Shaanxi Institute of Geological Survey, Xi'an 710054, China
  • Received:2018-01-24 Online:2019-07-26 Published:2019-07-26
  • Supported by:
    Supported by Projects of China Geological Survey (1212011120533, 12120114081901) and the Second Comprehensive Scientific Investigation and Research on the Qinghai-Tibet Plateau (2019QZKK0807)

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Abstract: The Lower-Middle Jurassic Longshan Formation is located at the south of Tanggai River-Xindie County tectonic melange belt (KSTB) in Taxkorgan area, Xinjiang. The clastic sedimentary rocks are dominated by marls and greywackes, and are a set of steel grey-gray carbonate clastic sediments with low maturity. Their source rocks have not been fully handled and sorted. The REE distribution patterns are uniform and similar to typical post-Archean shales and upper continental crust, with enriched LREE, flat HREE, and negative Eu anomaly. A sedimentary environment analysis shows that the sediments belong to shallow shelf-nearshore-foreshore environment,and are characterized by progradation sedimentation, indicating a regressive sequence. The sedimentary rock formed in tectonic-sedimentary setting of sea level decline and residual sea basin contraction. The tectonic settings of the provenance mainly belong to active continental margin with characteristics of continental island arc. Based on the regional tectonic environment, we conclude that the Middle-Lower Jurassic Longshan Formation is the sediments of residual marginal ocean, formed by completed Qiangtang block and Kunlun block, the source of Longshan Formation comes from the KSTB, the north of Longshan Formation.

Key words: West Kunlun, Taxkorgan, Longshan Formation, depositional environment, tectonic setting

CLC Number: 

  • P588.21
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