滇东北地区峨眉山玄武岩在铅锌成矿中的作用

川滇黔铅锌成矿域分布有大面积峨眉山玄武岩,绝大多数铅锌矿床位于峨眉山玄武岩之下。对于峨眉山玄武岩与铅锌成矿之间是否有成因上的关系,一直存在着两种观点：一种认为峨眉山玄武岩与铅锌成矿存在成因联系;另一种则认为峨眉山玄武岩与铅锌成矿无成因上的关系,两者仅仅是空间上的叠合。峨眉山玄武岩在滇东北地区铅锌矿床的形成过程中扮演着怎样的角色？本文在总结前人研究观点的基础上,结合地质事实,认为峨眉山玄武岩与铅锌成矿并无直接的成因联系;推测峨眉山玄武岩在铅锌成矿中分别起到了提供热动力活化、萃取成矿物质以及充当＂遮挡层＂和＂保护层＂的作用。

Effect of Emeishan basalt in northeast Yunnan on lead and zinc mineralization

Large-scale Emeishan basalt widely distributed in the Sichuan-Yunnan-Guizhou polymetallic belt, with most of lead-zinc deposits occurring in the Emeishan basalt. As for whether there is genetic connection between Emeishan basalt and lead-zinc deposits, there are two views： one view is that there is genetic con- nection between Emeishan basalt and lead-zinc deposits, the other is that no genetic connection, Emeishan basalt and lead-zinc deposits just the spatial overlap. What kinds of role Emeishan basalt play in the forma- tion process of lead-zinc deposits in the northeast of Yunnan province？ Based on the summary of previous da- ta, combined with geological facts, this paper consider that there is no genetic connection between Emeishan basalt and lead-zinc deposits, and speculation in the mineralization process, it is believed that the basalt pro- vided thermal power, activated and extracted metallogenic material from strata during the mineralization pe- riod, basalt played the role as a ＂block level＂ to promote the formation of deposits and as a ＂protective lev- el＂.