常见稀土氟碳酸盐氧同位素分馏研究  

Oxygen Isotope Fractionation of Common RE Fluorocarbonate

作　　者：方涛[1] 

机构地区：[1]中国科学院地球化学研究所

出　　处：《中国稀土学报》1997年第4期375-379,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金

摘　　要：氟碳酸盐是重要的稀土矿物，本研究利用增量模式讨论其氧同位素分馏性质，计算的氧同位素富集顺序为：氟碳铈矿＞Ｃａ０．５ＢａＣｅ２（ＣＯ３）４Ｆ＞白云鄂博矿＞黄河矿＞氟碳铈钡矿。结合白云鄂博矿床氟碳酸盐矿物氧同位素分析数据，可看出理论预测的分馏顺序与实际相一致，计算的成矿温度与矿区地质相吻合。由于钡系列氟碳酸盐矿物可看成是ＣｅＣＯ３Ｆ与ＢａＣＯ３层状堆垛衍生的结果，故对矿物体衍生过程中氧同位素分馏的变化进行了讨论，并由此预测了中华铈矿和氟碳钡铈矿的氧同位素分馏曲线。?Fluorocarbonate is one of the most important RE ore minerals in the earth. With the increment Model oxygen isotope fractionation of RE fluorocarbonates were discussed.18Oenrichment order was obtained as follows: bastnaesite>cordylite>Ca0.5BaCe2(CO3)4F>baiyuneboite>huangheite>cebaite. Combined with the oxygen isotopic composition of RE fluorocarbonate in Bayan Obo ore deposite, better accordance in 18Oenrichment order and oreforming temperature were gotten. Because barium fluorocarbonates are formed by stacking CeCO3F and BaCO3 layers along the direction c, oxygen isotope fractionation in this stacking was discussed, and I of zhonghuacerite and cordylite were predicted with this model.

关 键 词：稀土氟碳酸盐 氧同位素 同位素分馏 

分 类 号：P618.7[天文地球—矿床学]