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地球学报  2004 

西藏台错盐湖TT-1剖面的沉积特征和年代学研究

Keywords: 西藏台错,盐湖沉积,年代学,古气候

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Abstract:

台错位于西藏羌塘高原西部,这里因环境恶劣而无人类污染和影响。笔者调查了该湖区一级阶地的湖相化学沉积,取得了TT-1剖面(厚度369cm)连续样品156个,平均单样厚度2.36cm。就台错剖面的年代测定,本文分别对同一样品进行了不同方法的测试和相互校验。研究表明,^14C方法对有机物质的定年是准确的,而在消除盐湖化学沉积建造中碳酸盐的“新碳”、“老碳”的影响方面,仍需做进一步的研究。与此同时,铀系法测年的全溶样品的等时线技术,避免了同位素的分馏问题,所有的测试数据在等时线上都有良好的线形关系,表明获得的年龄数据是合理的。从而确定了TT-1剖面盐湖沉积的可靠地质时代为32.6~4.5kaBP间的晚更新世晚期至全新世中期。

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