摘要
本文运用晶体场理论研究了Cu^(2+)在黑云母中的富集和稳定性。指出Cu^(2+)的富集性主要是依赖于黑云母单位晶胞八面体中的总阳离子数值∑y;Cu^(2+)的稳定性主要是依赖于其晶体场分裂参数D_q值。在其他条件相同时,黑云母中铜含量愈高,稳定性愈弱,在蚀变过程中析出的铜量愈大。
This paper discusses the enrichment and stability of Cu2+ in biotite on the basis of the crystal-field theory. It is pointed out that the enrichment of Cu2+ depends mainly on the total cation value-∑Y in the biotite unit cell octahedra. That is to say, the greater the value, the higher the content of Cu. The stability of Cu2+ depends mainly on its crystal-field splitting parameter Dq In case the average distance between the cation and the co-ordination polyhedra in the centre of biotite octahedron, R, is big, the contents of Cl- F- and H2O+ (especially Cl-) are high and the stability of Cu2+ is low. On condition that other factors remain constant, the higher the content of Cu in biotite is, the lower its stability and the higher the con-tent of Cu leached out in the process of alteration will be.
出处
《地球化学》
CAS
CSCD
北大核心
1989年第1期62-69,共8页
Geochimica
