锌同位素在矿床学中的应用:认识与进展  

Application of Zn isotopes to study of mineral deposits:A review

作　　者：王跃[1] 朱祥坤[1] 

机构地区：[1]中国地质科学院地质研究所国土资源部同位素地质重点实验室,北京100037

出　　处：《矿床地质》2010年第5期843-852,共10页Mineral Deposits

基　　金：国家重点基础研究发展规划项目(2007CB411408);基本科研业务费(J0702)共同资助

摘　　要：文章报道了安徽铜陵新桥和凤凰山矽卡岩型矿床中闪锌矿和共生黄铁矿间的Zn同位素组成,获得了锌同位素在这2个矿物间的分馏系数,系统总结了锌同位素在不同储库和不同类型矿床中的分布特征,结合最新的研究成果,较全面地总结了锌同位素在矿床学领域的应用,得出了锌同位素可以用来示踪流体演化和源区变化的基本认识。在成矿流体体系的演化过程中,随着矿物的沉淀,流体的逐渐富集重同位素,晚期矿物相对于早期矿物富集锌的重同位素。在热液流体对同一源区淋滤萃取的过程中,重同位素优先被淋滤出来,晚期淋滤出的流体相对早期淋滤出的流体富集轻同位素。This paper reports Zn isotope compositions of sphalerites and associated pyrites from the Xinqiao and the Fenghuangshan skarn type sulfide deposits in Anhui Province. Sphalerite pyrite fractionation factor is also discussed. Basic distribution of Zn isotope composition in different reservoirs and different types of deposits is systematically summarized in this paper. Based on results obtained by previous researches,this paper deals systema-tically with the application of Zn isotope system to the study of ore deposits. It is found that Zn isotope can be used to trace the fluid evolution and the variation of source area. During the fluid evolution in a hydrothermal fluid system,the fluid became enriched in heavier Zn isotope with the precipitation of minerals. Zn isotope composition of late stage minerals is heavier than that of early stage minerals. During the leaching of the same source area,the source area was gradually depleted in heavy Zn isotope with the preferential leaching of heavy Zn isotope by hydrothermal fluids,resulting in the more depletion of the heavy isotope in the late fluid than in the early fluid.

关 键 词：地球化学 锌同位素 矿物对 流体演化 源区变化 铜陵 

分 类 号：P618.43[天文地球—矿床学]