Volume 28 Issue 6
Dec.  2022
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Article Navigation >  Journal of Geomechanics  > 2022  >  28(6): 1024-1034
GONG Lingfeng, ZHANG Yunda, TIE Yongbo, et al., 2022. Development history and activity characteristics of typical debris flows in the Grand Bend of the Yarlung Zangbo River since the Holocene. Journal of Geomechanics, 28 (6): 1024-1034. DOI: 10.12090/j.issn.1006-6616.20222826
Citation: GONG Lingfeng, ZHANG Yunda, TIE Yongbo, et al., 2022. Development history and activity characteristics of typical debris flows in the Grand Bend of the Yarlung Zangbo River since the Holocene. Journal of Geomechanics, 28 (6): 1024-1034. DOI: 10.12090/j.issn.1006-6616.20222826
shu

Development history and activity characteristics of typical debris flows in the Grand Bend of the Yarlung Zangbo River since the Holocene

doi: 10.12090/j.issn.1006-6616.20222826
  • 1.

    Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China

  • 2.

    Technology Innovation Center for Risk Prevention and Mitigation of Geohazard, Ministry of Natural Resources, Chengdu 611734, Sichuan, China

  • 3.

    Observation and Research Station of Chengdu Geological Hazards, Ministry of Natural Resources, Chengdu 610000, Sichuan, China

  • 4.

    Chengdu Engineering Corporation Limited of Power China, Chengdu 610072, Sichuan, China

  • 5.

    Key Laboratory of Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource of Sichuan Province, Sichuan Geological Survey, Chengdu 610081, Sichuan, China

  • 6.

    Institute of Geophysics & Geomatics, China University of Geosciences (Wuhan), Wuhan 430074, Hubei, China

  • 7.

    China University of Geosciences (Beijing), Beijing 100083, China

Funds:

the National Natural Science Foundation of China U20A20110-01

the Geological Survey Project of the China Geological Survey DD20221746

More Information
  • Received: 2022-06-21
  • Revised: 2022-09-24
    Abstract

  • Multi-period debris flows have been developed in the last glacial period of the late Pleistocene-Holocene near the Grand Bend of the Yarlung Zangbo River in southeast Tibet, which combined to form a modern large-scale fan-shaped accumulation. The debris flows in the Bangga gully, Pai Town, were explored by ground survey, borehole, and 14C dating methods to investigate the chronological sequence of formation, accumulation depth, and outrush range. The analysis results show that there are still small-scale debris flows in the tributaries of the Bengga gully, and they are widely accumulated in the channel, but no debris flow accumulation has been found in the existing accumulation fan area. The Holocene debris flows in the Bunga gully were active around 8500 years ago, and the cumulative accumulation depth of a single period is about 10.9 m. The two carbon samples in the light gray silt sand formed by the shallow lake facies (fluvial facies) show that the modern riverbed of the Yarlung Zangbo River was deposited at a depth of about 0.4 m in 40 to 100 years, and the annual average deposition rate was about 4~10 mm. The boreholes at 2906.1~2896.7 m and 2849.4~2848.2 m above sea level reveal a thickness of 9.4 m and 1.2 m cake-like bluish-gray clay in turn. It is assumed that two river-blocking events occurred. The above results could provide a reference for the study of the debris flow activity characteristics since the Holocene in this region.

     

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