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地质学报  2001 

碳酸钙同质多象转变过程中氧同位素分馏的实验研究

, PP. 267-276

Keywords: 碳酸钙氧同位素分馏矿物合成同质多象转变氧继承性温度方解石

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Abstract:

本文通过“一步法”和“两步法”的“附晶生长法”分别合成了碳酸钙矿物,对其进行了同质多象转变过程中的氧同位素分馏行为的研究。同时通过真空条件下的同质多象转变实验,对文石和方解石的酸分馏系数的差异进行了实验验证。结果发现:①在50℃和70℃下,如果文石与水之间的氧同位素分馏未达到平衡,由母体文石经过同质多象转变生成的次生方解石完全继承的母体矿物的氧同位素组成。如果文石与水之间的氧同位素分馏达到平衡,由互过同质多象转变生成的次生方解石部分继承母体文石的氧同位素组成,并且次生方解石相对于母体文石富集^18O。②在0℃和25℃下,“一步法”的“附晶生长法”的实验结果表明,由六方方解石经过同质多象转变生成的次生方解石也完全继承母体矿物的氧同位素组成,并且在该温度下,矿物与水之间的氧同位素分馏与温度无关。

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