摘要
SRXRF微探针分析结果表明:金绿宝石和变石中主要的微量元素组成分别是Fe、Ga、Ti、Ca和Fe、Cr、Ti、Ca;Cr含量及Cr/Fe比不同是两种宝石微量元素的主要区别及形成不同颜色的原因。金绿宝石中的Ga含量达1600×10-6,说明它是又一载Ga矿物。SRXRF实验分析还得到了两种宝石中微量元素的相关性关系和浓度变化规律,结果表明在金绿宝石中主要是Ga、在变石中主要是Cr与其它微量元素负相关而相互替代;自金绿宝石或变石的中心到边缘处,Ti含量逐渐降低,Ga或Cr含量逐渐增加,Ti优先被Ga或Cr替代出晶格而形成猫眼;这两种宝石的形成还有富Ga或富Cr的成矿物质的加入。
From SRXRF microprobe analyses, it was concluded that the major trace elements in chrysoberyl are Fe, Ca, Ti, Ca and Fe, Cr, Ti, Ca in alexandrite. Dissimilar Cr contents and Cr/Fe ratios are the differences between chrysoberyl and alexandfite,thus leading to different colors. Ca content is 1600 × 10^-6 on average, showing that chrysoberyl is another important mineral rich in Ca. By SRXRF analysis it was also found that Ca and other trace elements in chrysoberyl have negative correlations and substitute each other, so do Cr and other trace elements in alexandrite. From the core to the edge of the crystal, the contents of Ga or Cr increase and those of Ti decrease; Ca or Cr firstly substitute Ti and then form cat＇ s eye. The formation of chrysoberyl or alexandrite should depend on the incorporation of other substances rich in Ca or Cr.
出处
《矿物学报》
CAS
CSCD
北大核心
2006年第1期77-83,共7页
Acta Mineralogica Sinica
基金
国家留学基金委2003年度出国留学基金
