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地质学报  2012 

白云鄂博的碳锶铈矿

, PP. 837-841

Keywords: 碳锶铈矿,白云鄂博,稀土矿物,碳酸岩

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Abstract:

在对白云鄂博碳酸岩中稀土矿物的研究中,发现了锶-稀土含水复碳酸盐矿物。根据电子探针分析结果,其化学成分相当于碳锶铈矿(ancylite-Ce)、钙碳锶铈矿(calcioancylite),前者Sr>Ca,后者Ca>Sr。计算得到的化学式分别为:(Sr0.62,Ca0.18)0.8(Ce0.5,Nd0.36,La0.17,Pr0.02,Sm0.02)1.2(CO3)2(OH1.04,F0.14)1.2H2O(Ca0.73,Sr0.28,Ba0.17)1.2(Ce0.46,Nd0.15,La0.15,Pr0.04,Sm0.01)0.8(CO3)2(OH0.75,F0.06)0.8H2O简化为:(Sr,Ca)2-xCex(CO3)2?(OH,F)2-x?H2O,接近理论化学式(Sr,Ca)Ce(CO3)2(OH)H2O但附加阴离子除OH―外,还含有少量F-。两者均为几微米至十几微米的微小晶体呈浸染状产出,且仅见于晚期方解石或方解石―白云石交生体中。

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