Advances in Earth Science ›› 2018, Vol. 33 ›› Issue (3): 321-332. doi: 10.11867/j.issn.1001-8166.2018.03.0321

Special Issue: 青藏高原研究——青藏科考虚拟专刊

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Late Quaternary Slip Rate of the Xiugou Segment, Eastern Kunlun Fault Zone

Feipeng Huang( ), Junjie Ren *( ), Yanwu Lü, Junxiang Zhao   

  1. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
  • Online:2018-03-20 Published:2018-05-02
  • Contact: Junjie Ren;
  • About author:

    First author:Huang Feipeng(1993-), male, Hanyuan County, Sichuan Province, Master student. Research areas include active tectonics and tectonic geomorphology.

  • Supported by:
    Project supported by the Research Grant from Institute of Crustal Dynamics, China Earthquake Administration “Extension and uplift of the southeastern margin of the Qinghai-Tibet Plateau”(No.ZDJ2017-24);The National Natural Science Foundation of China “Historical reconstruction of Quaternary tectonic uplift in the southeastern margin of the Qinghai-Tibet Plateau based on the exposure age of terrace”(No.41472139).

Feipeng Huang, Junjie Ren, Yanwu Lü, Junxiang Zhao. Late Quaternary Slip Rate of the Xiugou Segment, Eastern Kunlun Fault Zone[J]. Advances in Earth Science, 2018, 33(3): 321-332.

The Eastern Kunlun fault zone (EKLF) is a large left-lateral strike-slip fault, whose slip rate is meaningful to seismic hazard assessment and geodynamics of the Tibetan Plateau. Previous studies suggested that the late Quaternary average slip rate was stable and uniform (10~13 mm/a) in the central and western segment of the EKLF. But there were a few researches of accurate slip rate in the central segment on the EKLF. Therefore, we focused on an offset and well preserved alluvial fan from Xiugou basin, located in the east of Xidatan-Dongdatan, to make it clear. Moreover, we used high-resolution satellite images and digital elevation model extracted from SPOT7 stereo image pairs to restore the offset alluvial fan, and combined terrestrial cosmogenic nuclides method, including 13 quartz-rich samples from this fan surface, 1 quartz-rich sample from the main active channel bed and 1 10Be depth profile from this fan edge to eliminate the 10Be concentration of inheritance accurately, with 1 optically stimulated luminescence sample to obtain the reliable age of this alluvial fan together. Referring to field observations, this alluvial fan was offset left-laterally by (1 862±103) m, and its age is (76.55±3.20)~(106.37±3.38) ka which can be determined through the actual geologic setting and improving chi-square test. Thus, we used the Monte Carlo method to obtain a left-lateral slip rate of (20.3+3.5/-2.3) mm/a with 68% confidence envelopes since the late Pleistocene in the Xiugou basin. As a result, combining with the results of previous studies, the left-lateral slip rate indicated that the obviously decreasing activity transferred from late Pleistocene to Holocene on the central segment of the EKLF.

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