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Lacustrine Sediments' U-seires Age and Its Significance in Jiezechaka Lake of Tibet
Author(s): 
Pages: 6-10
Year: Issue:  3
Journal: JOURNAL OF EARTH SCIENCES AND ENVIRONMENT

Keyword:  U系年龄晚更新世湖泊演化气候环境结则茶卡西藏;
Abstract: 通过对藏北高原西北部结则茶卡湖泊及其沿岸地质地貌调查,发现其为一个富含硼、锂、钾、锶的封闭型盐湖,沿岸海拔4850m拔湖325m有一条明显的高位湖岸线,该湖岸线到湖面之间有六级湖积阶地发育,六级以上阶地保存零星.沿湖岸不同高度上的湖积物U系年龄分别为(14.2±1.2)ka BP(T2)、(38.0±3.5)ka BP(T4)和(41.6±3.2)ka BP(T5).湖面下降的幅度是藏北高原迄今所知最大.根据湖面平均下降速度推算高位湖岸线和高位湖积层的形成年龄在(120~90)ka BP,与东部的纳木错和西部的甜水海基本一致,说明藏北高原在晚更新世初期有一个明显的泛湖期.大约100ka BP结则茶卡湖面开始下降,晚更新世以来湖泊演化是在封闭体系干旱环境下进行的,盐湖形成于14ka BP左右,藏北高原在晚更新世以来气候变化可能为自西向东逐渐变为干寒.
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