Evolution of chemical composition of pyrochlore group minerals from phoscorites and carbonatites of the Khibina alkaline massif
Evolution of chemical composition of pyrochlore group minerals from phoscorites and carbonatites of the Khibina alkaline massif
复制标题
希比纳碱性地块磷闪石和碳酸岩中烧绿石族矿物化学成分的演化
DOI：
10.1134/s1075701512070094
复制
发表时间：
2012
影响因子：
0.7
通讯作者：
A. A. Zolotarev
中科院分区：
文献类型：
--
作者：
A. Zaitsev;C. Williams;F. Wall;A. A. Zolotarev
俄罗斯Khibina碱性火山岩中的辉石岩和碳酸岩含有三种烧绿石族矿物。按结晶顺序，它们是：磷块岩中的铀烧绿石和烧绿石，以及晚期方解石碳酸岩中的烧绿石和钡烧绿石。早期方解石碳酸岩中也含有铀烧绿石和烧绿石，但它们是由磷块岩衍生的捕虏晶。烧绿石族矿物的蚀变导致U、Ti和水含量增加，Na、Ca、Nb和F含量降低。Ryabchikov和汉密尔顿（1993，1994）关于碳酸盐-磷酸盐熔体与地幔橄榄岩相互作用的实验解释了磷块岩中环带状铀烧绿石到烧绿石晶体的结晶作用。
Phoscorites and carbonatites of the Khibina alkaline massif, Russia contain three minerals of the pyrochlore group. They are, in order of crystallization: uranpyrochlore and pyrochlore in the phoscorites, and pyrochlore and bariopyrochlore in late calcite carbonatites. Early calcite carbonatites also contain uranpyrochlore and pyrochlore, but they are xenocrysts derived from the phoscorites. Alteration of the pyrochlore group minerals led to increasing U, Ti and water contents and decreasing Na, Ca, Nb and F contents. Crystallization of zoned uranpyrochlore to pyrochlore crystals in the phoscorites is explained by the experiments of Ryabchikov and Hamilton (1993, 1994) on the interaction of carbonate-phosphate melts with mantle peridotites.