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首页> 外文期刊>Journal of Paleolimnology >Late Quaternary-Holocene lake-level changes in the eastern margin of the Thar Desert, India
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Late Quaternary-Holocene lake-level changes in the eastern margin of the Thar Desert, India

机译：印度塔尔沙漠东部边缘的第四纪-全新世晚期湖平面变化

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摘要

A study on two closed salt lake basins, Tal Chapar and Parihara in the eastern margin of the Thar Desert, Rajasthan, was carried out to unravel late Quaternary geomorphic evolution of these saline lakes. Both lakes are elliptical in shape bordered by stabilised dunes, and are oriented in a NE-SW direction, i.e., in the direction of the prevailing summer monsoon wind. Both lakes have been formed in the wind-shadow zones of isolated hills of Precambrian quartzite. Our study indicates that the late Quaternary sediments in the lakes began with the cyclic deposition of laminated fine silt layers (0.5 m thick), rich in organic matter, alternating with ripple cross-bedded sand layers (each ～1.5–2 m thick). Sand layers that are moderately sorted are separated by laminated silt-clay layers with gypsum/calcite and this unit occurs in the upper most 4 m sequence in deeper sections. The presence of gypsum crystals within the laminated sediments suggests a high concentration of Ca in the inflowing water.
机译：对拉贾斯坦邦塔尔沙漠东部边缘的两个封闭盐湖盆地，Tal Chapar和Parihara进行了研究，以揭示这些盐湖的第四纪晚期地貌演化。两个湖泊的形状均为椭圆形，以稳定的沙丘为边界，并且朝向NE-SW方向，即盛行的夏季风。这两个湖都形成在前寒武纪石英岩孤立山丘的风影带中。我们的研究表明，湖泊中的第四纪晚期沉积物始于层状细粉砂层（0.5 m厚）的循环沉积，这些粉砂层富含有机质，并与波纹状的交错层状砂层（每个〜1.5–2 m厚）交替出现。适度分类的砂层由含石膏/方解石的粉砂粘土层隔开，该单元出现在较深部分的最高4 m层序中。层状沉积物中石膏晶体的存在表明流入水中的钙浓度很高。

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