安徽沙坪沟斑岩型钼矿床地质特征及综合找矿信息

Geological characteristics and comprehensive ore-prospecting information of Shapinggou porphyry-type molybdenum deposit in Anhui Province

沙坪沟钼矿位于安徽省金寨县,是在大别山发现的一个特大型隐伏斑岩型钼矿床。文章根据最新的矿床勘查成果,详细分析了矿床成矿地质条件及矿床地质特征,得出以下几点认识:断裂构造不仅是控岩构造,而且也是导矿构造;隐伏花岗斑岩体不仅提供了矿质来源,同时还控制了矿体空间分布、产状及规模。含矿岩体以富硅、富碱、过铝型以及w(K)>w(Na)为特征。岩体与围岩接触带交代蚀变作用强烈,常见的围岩蚀变有硅化、钾长石化、黄铁矿化、绢云母化、绿泥石化、方解石化等。同时提出了该地区综合找矿信息及找矿思路。

Located geographically in Jinzhai of Anhui Province,the Shapinggou porphyry-type molybdenum deposit is a superlarge molybdenum deposit in eastern Dabie orogen.The authors studied the metallogenic conditions and geological characteristics of this ore deposit on the basis of the latest exploration results.The faulted structures played both ore-controlling and ore-hosting roles,and the metallogenic material originated from the concealed granite-porphyry bodies,which controlled the shapes.attitudes and sizes of the ore bodies.The ore-bearing intrusions are characterized by enrichment of SiO2 and alkali,relatively high Al2O3 and higher K2O than Na2O.There are extensive metallogenic alterations in the contact zone between the intrusion and the wall rock,such as silicifiation,K-feldspathization,pyritization,sericitization,choritization and calcitization.The comprehensive ore-prospecting information and idea for such ore deposits are put forward in the paper.