盐湖中盐类矿物沉积过程中氯同位素效应的初步研究  

The Preliminary Investigation on Chlorine Isotopic Fractionation During the Crystallization of Saline Minerals in Salt Lake

作　　者：肖应凯[1] 刘卫国[1] 张崇耿[1] 

机构地区：[1]中国科学院青海盐湖研究所

出　　处：《盐湖研究》1994年第3期35-40,共6页Journal of Salt Lake Research

基　　金：国家自然科学基金

摘　　要：采用Ｃｓ２Ｃｌ＋离子正热电离质谱测定氯同位素的方法，初步研究了盐湖卤水中盐类矿物结晶过程中的氯同位素分馏．研究结果表明，在自然条件下，盐类矿物自盐湖卤水中结晶时，３７Ｃｌ优先进入固相，这是造成盐湖卤水中氯同位素组成变化的重要因素．但在实验室条件下，盐类矿物自盐湖卤水中快速结晶时，则有相反的氯同位素分馏发生，即３５Ｃｌ优先进入固相，本文初步讨论了这种绝然相反的氯同位素分馏的机理．A prelminery investigation on isotopic fractionation of chlorine in brine during crystallization of saline minerals has been studied by the procedure based on the measurment of Cs2Cl+ ion using thermal ionization mass spectrometry. The resuls show that the 37Cl preferentialy enters into the solid phase during the incorporation of dissolved chlorine into the chloride salts in the nature. This is important factor causing the isotopic variations of chlorine in-brine. A converse chlorine isotopic fractionation during the quick crystallization of chloride salts in the laboratory has been observed and the mechanism for this isotopic fsactionation of chlorine has been discussed.

关 键 词：盐湖 盐类矿物 沉积过程 氯同位素 

分 类 号：P578.3[天文地球—矿物学] P512.3[天文地球—地质学]