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Landslides

pp 1–16 | Cite as

Emplacement mechanisms of the Tagarma rock avalanche on the Pamir-western Himalayan syntaxis of the Tibetan Plateau, China

  • Yu-Feng WangEmail author
  • Qian-Gong Cheng
  • Yun-Qiang Yuan
  • Jie Wang
  • Yu-Heng Qiu
  • Bang-Min Yin
  • An-Wen Shi
  • Zhen-Wei Guo
Original Paper

Abstract

To determine the emplacement mechanisms of rock avalanches, the surficial and internal sedimentological characteristics of avalanche deposits are attracting increased scientific interest. In this study, deposits of the massive paleoseismic Tagarma rock avalanche in the Tarim Basin of the Pamir-western Himalayan syntaxis, China, are investigated to enrich the knowledge on rock avalanche dynamics. Based on a combination of remote sensing data and in situ surveys, a series of typical surficial landforms, including a Toreva block, arc-shaped transverse ridges, aligned megablocks, and longitudinal lineament, are studied in detail. Clusters of superimposed gneiss megablocks preserving the bedrock structures of the source scar are widely distributed along the travel path. Moreover, inverse grading in the deposit and a substrate characterized by clast-supported pebbles with imbricate structures are also observed. Cracks and fissures are common in most pebbles, indicating intense interactions between the avalanche mass and the substrate. Through analysis of these surficial and internal characteristics, we propose that the avalanche mass should have propagated rapidly as a single unit with slight internal mixing and high internal pressure fluctuations. These internal pressure fluctuations obviously exceeded the overburden pressure and contributed to the intense shattering of the main deposit, especially the basal facies. The basal facies was mainly emplaced by a frictional, simple shear process and controlled the avalanche hypermobility. From the proximal to the distal parts, the transport of the avalanche mass can be classified as an extension-dominated sliding process in the transition zone and a compression-dominated sliding process in the accumulation zone.

Keywords

Rock avalanche Surficial landforms Internal sedimentary structures Emplacement mechanisms 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (grant numbers 41530639, 41877237, 41502289, 41761144080, and 41877226), the National Key Research and Development Program of China (grant number 2017YFC1501000), and the Fundamental Research Funds for the Central Universities (grant numbers 2682019CX18 and 2682016CX088). We would like to thank Springer Nature Author Service for English language editing.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interests.

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© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Geological EngineeringSouthwest Jiaotong UniversityChengduChina
  2. 2.Key Laboratory of High-Speed Railway EngineeringMinistry of EducationChengduChina
  3. 3.State-Province Joint Engineering Laboratory of Spatial Information Technology of High-Speed Rail SafetyChengduChina

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