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地球学报  2002 

西藏纳木错湖相沉积的铀系年代学研究

Keywords: 西藏纳木错,湖相沉积,铀系年代学

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Abstract:

纳木错是西藏海拔最高的大湖,位于藏北内流区东南部。研究中应用铀系全溶样品的等时线技术所测定的纳木错西北岸3个剖面的8个富含碳酸盐湖相沉积物样品的年龄。其实验程序是:先按矿物的粒径将样品分成若干子样品,全溶子样品并分别测试它们的230Th/232Th和234U/232Th比值,然后通过年龄等时线来校正由碎屑物带来的初始钍的影响,从而避免了常用的稀酸淋滤法难于验证的同位素分馏问题。测试结果显示,在等时线上所有数据都有良好的线性关系,表明所获得的年龄数据是合理的。由

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