摘要
根据国内外许多钾盐矿床大量样品测定的结果：通常石盐（岩）的37Cl／35Cl比值和δ37Cl（％）值高于钾石盐（岩）；钾石盐高于光卤石（岩）。例如：西班牙Catalonia盆地钾盐矿床，其石盐岩为0．31958—0．31941和＋1．002─＋0．470‰，钾石盐岩为0．31913和─0．407‰，光卤石岩为0．31887和─1．221‰，等等。这说明了这些蒸发岩是在水体浓缩的不同阶段形成的，是氯同位素分馏作用长期不断进行的结果。其氯同位素组成与Br、K和Mg含量有着密切关系。困而在我国找钾过程中，可将氯同位素组成及Br、K、Mg含量结合起来作为找钾标志考虑。
According to the analysed results of a lot of Samples taken from many potash depositsboth at internal and external,generally,halite＞Sylvite(sylvinite)＞carnallite (Carnallitolite) for their Chlorine isotopic ratio (37Cl/35Clandδ37Cl(‰) Value. For example, in the potash deposit of Catalonia Basin (Spair), halite: 0.31958-0.31941 and＋1. 002- ＋0.475‰, respectively;Sylvinite:0. 31913 and─0. 407‰, Carnallitolite: 0. 31887 and-1. 221‰, respectively, etc. It illustrates that they are formed in Various Water-bodies of different concentration,and result from the long term continully fractionation of chlorine isotopes. The Chlorine isotopic composition of those evaporits is closely associated with their contents of Bromine,potassium and magnesium.Thereby,it could take the assembinge of chlorine isotopic composition and contents of Br、K and Mg as the indicator of looking for potash deposits during the seeking minerals process in china in the near future.
出处
《盐湖研究》
CSCD
1997年第1期21-27,共7页
Journal of Salt Lake Research
基金
国家自然科学基金
