期刊
LANDSLIDES
卷 16, 期 3, 页码 523-532出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10346-018-1117-7
关键词
Nyixoi Chongco rock avalanche; Internal sedimentological structures; Transport forms; Avalanche kinematics
资金
- National Key Research and Development Program of China [2017YFC1501000]
- National Natural Science Foundation of China [41530639, 41502289, 41761144080, 41877226, 41877237]
- Fundamental Research Funds for the Central Universities [2682016CX088]
To learn the transport kinematics of rock avalanches, an outcrop study of the Nyixoi Chongco rock avalanche in the Yadong-Gulu Rift of the south Tibetan Plateau, China, is presented here. Sedimentological analysis associated with the outcrops allows important considerations of rock avalanche transport mechanisms. From the outcrops, a series of plastic-brittle deformations in the substrate, including diapiric structures, convoluted laminations, faults, and basal decollements, were observed, indicating the occurrence of a bulldozing effect between the avalanche mass and substrate. In addition, jigsaw structures, inner shear zones, and aligned clasts were found in the avalanche deposit, indicating the occurrence of a shear-dominated movement with differential internal stresses and limited disturbances. Therefore, this paper proposes that a simple shear process dominated the transport of the Nyixoi Chongco rock avalanche and contributed to the generation of these sedimentary structures. A lack of liquefied sandy structures in the outcrops indicates that liquefaction was not a key factor causing the hypermobility of the rock avalanche.
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