东秦岭-大别山燕山期岩浆作用与钼矿成矿作用研究进展

Research of magmatism and Mo ore-mineralization Related to Yanshanianin East Qinling-Dabie Mountain region

东秦岭-大别山地区是中国乃至世界上重要的有色金属、贵金属成矿带,尤其是钼矿已成为本地区最具特色的矿产,并且分布广泛,储量较大。钼矿赋存与燕山期岩浆岩作用密切相关,本文总结了该区燕山期岩浆岩空间分布与钼矿床空间分布的关系,特别是燕山晚期花岗斑岩对大型斑岩型钼矿成矿作用的影响。举例分析了本区域内千鹅冲、沙坪沟(超)大型斑岩型钼矿的基本特征、成矿时代、物质来源等特征,以此证明燕山期深源浅成的花岗岩基在深部发生分异演化,为浅部含矿小斑岩体提供大量的热液和矿物质,在小斑岩体浅部及以外更大范围的构造岩或围岩中成矿。钼成矿理论同样对该地区寻找铜金、铅锌矿床有重要的指导意义。

East Qinling-Dabie Mountain regionis the important metallogenic belt of non-ferrous metal and precious metal in China and the world,especially the molybdenum mines that have a wide distribution and large reserves have become the most characteristic mineral in this region.Thedeposit of molybdenum mines is closely related to the magmatism of Yanshanian,the relationship between spatial distribution of Yanshanianmagmatic rocks and spatial distribution of molybdenum deposits was summed up in this paper,especially the effects of late Yanshaniangranite porphyry on mineralization of large porphyry molybdenum.The basic characteristics,metallogenic age,material source and other characteristics fromQianechong、Shapinggou that all are(super)large porphyry molybdenummines from west to east inEast Qinling-Dabie Mountain region are analyzed,that can prove the Yanshanian granite bedrocks from deep magma and are generated in shallow parts that have differentiation evolution in deep positions.The differentiation evolution provide a large amount of hydrothermal and minerals for the shallow ore-bearing microfillite,and mineralization in the shallow area of small porphyry or outside of a wider rangeof tectonic rocks or surrounding rocks.The theory of molybdenum mineralization also has important guiding significance for finding copper and lead-zinc deposits in this area.