| 青藏高原东部河湖相沉积中的软沉积物变形的主要成因类型及其特征 |
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| 关键词:soft sediment deformation structure paleoearthquake seismics-related deposit fluvial-lacustrine sediments eastern Tibetan Plateau |
| 基金项目:国家自然科学基金项目(编号: 41807298; 41572346);中国博士后基金(编号: 2019M650788);中国地质调查局项目(编号: DD20190319; DD20190059) |
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| The Genetic Types of Soft Sediment Deformation Structures and Their Characteristics in the Fluvial-lacustrine Sediments,Eastern Tibetan Plateau |
| The cause and trigger mechanism of the soft sediment deformation structure is a “hot spot” in catastrophic sedimentology. Besides earthquake, non-earthquake genesis can also cause the soft sediment deformation structure. Therefore, the distinction between earthquake caused and non-earthquake caused soft sediment deformation structures is the key to understanding its deformation process and geological events. This paper focuses on discussing the earthquake caused and non-earthquake (rainstorm and fluvial erosion, tempest waves, floods, unevenly loads, gravity debris flows, collapse landslides, rock fall subsidence, freeze/thaw cycles, etc.) caused soft sediment deformation structures in the fluvial-lacustrine sediments, eastern Tibetan Plateau. It also analyzes the distinctive signs and environmental significances of the structures. Then, the relationship between the co-seismic soft sediment deformation structure and the post-seismic sedimentary structure is also discussed. We supposed that the soft sediment deformation structure triggered by earthquake have a small-scale in-terlayer deformation, which can be traced laterally and repeated vertically. Deformation strength and frequency have an obvious correlation with the distance to the faults. This study provides some basic data and theoretical basis for determining the types and mechanisms of disasters in eastern Tibetan Plateau. It also provides a novel evidence for a more comprehensive understanding of the paleoseismic events in this area. |
| ZHONG Ning,JIANG Han-chao,LI Hai-bing,XU Hong-yan,HUANG Xiao-long.2020.The Genetic Types of Soft Sediment Deformation Structures and Their Characteristics in the Fluvial-lacustrine Sediments,Eastern Tibetan Plateau[J].Acta Geoscientica Sinica,41(1):23-36. |
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