Glacier-dammed lake in Southeastern Tibetan Plateau during the Last Glacial Maximum
Glacier-dammed lake in Southeastern Tibetan Plateau during the Last Glacial Maximum
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DOI：
10.1007/s12594-012-0041-z
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发表时间：
2012-04
影响因子：
1.3
通讯作者：
Yuan Guangxiang;Zeng Qingli
中科院分区：
文献类型：
--
作者：
Yuan Guangxiang;Zeng Qingli
雅鲁藏布江下游的主要支流--普伦藏布江上游的松宗盆地，在喜马拉雅山东北结合带的湖泊、冲积阶地和沉积物中至少记录了一个全新世冰川阻塞湖。松宗滑坡的湖相存款厚度超过88米。湖相阶地内有18.33米厚的湖相粉砂层。湖相粉砂层底部和顶部的光释光年龄为22.5± 3.3kaB. P.，16.1± 1.7kaB. P.，古岸线和湖泊侵蚀带的存在证实了松宗湖的存在。松宗盆地内也有冰碛形成的阶地。在东曲谷口附近，高大的冰碛阶地十分突出。松宗盆地独特的湖泊沉积特征和古湖线表明，该湖相沉积与末次盛冰期东曲河流域冰川对普隆藏布河的阻塞有关。
Lacustrine, alluvial terraces and sediments record at least one Holocene glacially dammed lake in Songzong Basin immediately upstream of the Purlung TsangpoRiver, a main tributary of the downstream of Yarlung Tsangpo River, at the northeastern syntaxis of the Himalaya. The lacustrine deposit is more than 88 meters thick at the SongzongLandslide. There is an 18.33 meters thick layer of lacustrine silt within the lacustrine terrace. The Optical Simulated Luminescence (OSL) ages at the bottom and top of the lacustrine silt layerare 22.5±3.3ka B.P., and 16.1±1.7ka B.P., respectively, which indicates that the lacustrine deposits were formed during the Last Glacial Maximum ranging from 25kaB.P. to 15kaB.P.The ancient shorelines and the lake erosion zone confirm the preexistence of Songzong Lake. There are also terraces formed by moraines in the Songzong Basin. The high and large moraineterrace seen near the mouth of the Dongqu Valley is very prominent. The special characteristics of thelacustrine sediment and the ancient lake line in the Songzong Basin indicate that the lacustrinesediments are related to the blocking of the Purlung Tsangpo River by a glacier from DongquValley during Last Glacial Maximum.