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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Soft sediment deformation structures in late Quaternary abandoned channel fill deposit of Yamuna river in NW Sub-Himalaya, India
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Soft sediment deformation structures in late Quaternary abandoned channel fill deposit of Yamuna river in NW Sub-Himalaya, India

机译：印度西北喜马拉雅山亚穆纳河晚第四纪废弃河道填充沉积物中的软沉积物变形结构

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摘要

Soft sediment deformation (SSD) structures are observed in a 26-25 ka old fluvio-lacustrine channel-fill deposit in tectonically active Dun valley in NW Sub-Himalaya. This fluvio-lacustrine channel-fill deposit experienced intermittent inundation during initial phase of erosional avulsion with the growth of a plug bar causing complete channel abandonment. The facies depict variation from an active channel to rhythmite and lacustrine deposition in an abandoned channel setting. In the studied section, three zones of SSD structures comprising load structures, contorted beds, slumps, folds and faults are observed. These zones are invariably overlain by undeformed beds suggesting recurrent deformation. The varying geometry of SSD structures suggest gravity-driven viscous brittle deformation in the sediment column possibly due to differential liquidization in the beds with varying grain size, when the equilibrium was disturbed by a trigger mechanism. Since the region lies in the seismically active Himalayan belt, earthquake-induced strong ground motion may be the most plausible trigger mechanism for the observed SSD in the abandoned channel deposits and slope, sediment over-loading or groundwater change may not have played a major role.
机译：在喜马拉雅山西北部构造活跃的邓河谷中，在一个26-25 ka老的河湖通道充填物中观察到了软沉积物变形（SSD）结构。在冲蚀撕裂初期，这种河湖沉积物经历了间歇性淹没，其中塞杆的生长导致了通道的完全废弃。这些相描述了在废弃通道环境中从活动通道到脉动石和湖相沉积的变化。在研究部分中，观察到SSD结构的三个区域，包括载荷结构，扭曲的床，塌陷，褶皱和断层。这些区域始终被未变形的床层覆盖，表明经常发生变形。 SSD结构变化的几何形状表明，当平衡受触发机制干扰时，重力变化会导致沉积物柱中的粘性脆性变形，这可能是由于颗粒大小不同的床中不同的液化作用所致。由于该地区位于地震活跃的喜马拉雅带中，地震诱发的强烈地面运动可能是废弃通道沉积物和斜坡中观测到的SSD的最合理的触发机制，沉积物超载或地下水变化可能未发挥主要作用。

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