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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Large palaeolakes in Kaveri basin in Mysore Plateau: Late Quaternary fault reactivation
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Large palaeolakes in Kaveri basin in Mysore Plateau: Late Quaternary fault reactivation

机译：迈索尔高原Kaveri盆地的大型古湖：晚第四纪断层复活

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摘要

Late Quaternary movements along the faults that demarcate tectonic boundaries of the N-S trending terranes of Biligirirangan and Closepet Granite in the Southern Indian Shield caused pending of the River Kaveri and its tributaries Suvarnavati, Kabini and Shimsha of the Mysore Plateau. The resulting large lakes stretched tens of kilometres upstream in their valleys. Approximately 10 m thick black carbonaceous clay, characterized by prolific calcareous nodules including rhyzocretions in the top horizon, and covered locally by overbank fine sediments in floodways, represents the lakes that came into existence in the Late Pleistocene and lasted until Late Holocene. Subsequent fault movements were responsible for vertical displacement and attenuation of the lacustrine sediments. On-going movement is indicated by stream pending in some segments and accelerated erosion of the elevated blocks. [References: 16]
机译：沿断层的晚期第四纪运动划定了南印度洋盾构Biligirirangan和Closepet花岗岩的N-S趋势地层的构造边界，造成了迈索尔高原的Kaveri河及其支流Suvarnavati，Kabini和Shimsha的悬而未决。由此产生的大型湖泊在其山谷上游向上游延伸了数十公里。大约10 m厚的黑色碳质粘土，其特征是多石灰质的结节，包括在顶部地平线上的根状生根，并在洪水泛滥区中局部地被高溢的细沙覆盖，代表了晚更新世以来一直存在并持续到全新世的湖泊。随后的断层运动导致了湖相沉积物的垂直位移和衰减。正在进行的运动通过某些区段中的水流悬空以及高架块的加速侵蚀来表明。 [参考：16]

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