【摘要】 采用基于Ｃｓ２Ｃｌ＋离子的正热电离质谱高精度测定氯同位素方法（在９５％的置信水平时，测定精度为０．０２％），测定了柴达木盆地察尔汗盐湖ＺＫ─８９０４钻孔原生石盐和次生石盐中氯同位素组成．研究表明五万年以来察尔汗地区氯同位素组成δ３７Ｃｌ的变化范围为－１．１５７～－０．３７９‰（ＳＭＯＣ）．根据氯同位素，组成的变化规律并结合ＺＫ─８９０４钻孔中氢氧同位素组成，推断出在此期间察尔汗盐湖至少经历了三次较大规模的淡化，冰后期和增温干旱期的两次湖水淡化对现代盐湖的形成起到了重要的作用，同时也复证了该地区的古气候演化模式。更多还原

【Abstract】 The stable chlorine isotope ratios 37Cl/35 Cl in core ZK─8904 was measured with respect to quaternary prime halttes of Charhan Salt Lakes (west of China).δ37 Cl measurements,expressed relative to standard mean ocean chloride (SMOC), ranged from-1. 229～0. 379‰,(precision 0. 34‰). The result showed that Qarhansalt lake was dilutted three times from 50. 000 to about 10. 000 years. It is consistent with indicating the paleoclimate of Qarhan area by oxygen and hydroge isotopes.更多还原