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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Landslide-dammed lakes in the alaknanda basin, lesser himalaya: Causes and implications
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Landslide-dammed lakes in the alaknanda basin, lesser himalaya: Causes and implications

机译：小喜马拉雅山阿拉克南达盆地滑坡筑坝的湖泊：成因与意义

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摘要

We present observations on landslide-dammed lake deposits located in the vicinity of the E-W and NW-SE trending, south-dipping North Almora Thrust, in the Alaknanda Basin around Srinagar Garhwal. Preliminary observations suggest that activation of crumpled and unstable phyllite dominated slopes led to temporary damming of second and third order tributaries of the Alaknanda river. Sedimentary styles of the succession indicate deposition under the transient lacustrine environment, with seasonality. Luminescence chronology suggests that the lakes were formed after the Last Glacial Maximum (LGM) and probably continued till the Mid-Holocene. Lake formation is attributed to the reactivation of phyllite-dominated slopes following the reestablishment of the southwest monsoon after the LGM. Presence of contorted laminas is interpreted as episodic events of seismic activity. Finally the lakes disappeared due to large-scale slope reactivation around Mid-Holocene.
机译：我们对位于Srinagar Garhwal附近的Alaknanda盆地E-W和NW-SE趋势附近，南倾北阿尔莫拉推力附近的滑坡坝湖沉积物进行了观测。初步观察表明，褶皱和不稳定的千枚岩为主的斜坡的激活导致阿拉克南达河二，三级支流的临时筑坝。演替的沉积方式表明在短暂湖相环境下具有季节性沉积。发光年表表明，湖泊是在最后一次冰期最大值（LGM）之后形成的，并且可能一直持续到全新世中期。湖泊形成归因于LGM后西南季风重建后，以叶绿岩为主的斜坡重新活化。扭曲的叶片的存在被解释为地震活动的偶发事件。最后，由于中全新世附近大规模的斜坡复活，湖泊消失了。

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