独居石微粒微区成分分布的研究

独居石微粒微区成分分布的研究

洪文兴，朱祥坤

1. 中国科学院广州地球化学研究所，广州，510640；2. 英国牛津大学地球科学系，Oxford, OXI 3PR, UK

收稿日期:2000-06-20 修回日期:2000-06-20 出版日期:2000-06-20 发布日期:2000-06-20

A Microanalysis Study on Monazite Composition Distribution

HONG Wen-xing1, ZHU Xiang-kun2

1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou; 2. Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OXI 3PR, UK

Received:2000-06-20 Revised:2000-06-20 Online:2000-06-20 Published:2000-06-20

摘要/Abstract

摘要： 采用电子探针(EPMA)分析研究了花岗岩、伟晶岩和热液交代等三种不同成因的独居石微粒微区成分分布的特征。分析数据表明，花岗岩和花岗伟晶岩成因的独居石微粒中La和Ce的含量低, 而Sm、Gd、Y、Th的含量明显较高。热液交代成因的独居石微粒中，La、Ce的含量高，而Gd、Th、Y的含量明显较低。根据微区剖面(0.18mm)元素分布曲线，指出了La、Ce、Nd、P、Th、Si、Ca和U等元素表现出8～10个微环带成分不均匀分布的特点，并认为成矿溶液的地质环境、温压和微量元素含量变化是不均匀分布的主要原因。

Abstract: The monazite samples of various genetic types are taken fro m different localities in China and have been analysed by EPMA. The available analytical data show that the monazites of magmatic granite and pegmatite have l ower contents of La (4％～13％), Ce (18％～28％) and higher contents of Sm (2％～5％), Gd (1％～3％), Y (1％～3％), Th (3％～7％). The monazite of hydrothermal metasomatic origin has higher contents of La (12％～18％), Ce (>28％), and lowe r contents of Gd (<0.3％), Th (0.1％～0.3％) and Y (0.06％～0.14％). The composi tional change profiles of monazite demonstrate a heterogeneous distribution of e lements La, Ce, Nd, P, Th, Si, Ca and U. This was caused by the differences in geological environments, temperatures, pressures and compositions of the hy drothermal solutions.

洪文兴，朱祥坤 . 独居石微粒微区成分分布的研究[J]. J4.

HONG Wen-xing1, ZHU Xiang-kun2. A Microanalysis Study on Monazite Composition Distribution[J]. J4.