福建平和福里石铍(钼)矿地质特征及成因初探

Geological characteristics and genesis of Fulishi beryllium(molybdenum) deposit in Pinghe,Fujian

平和福里石铍(钼)矿矿体赋存于侏罗系上统南园组火山碎屑岩的断裂裂隙中,侧伏和隐伏的花岗岩体为主要的成矿母岩,是岩浆热液和成矿物质的提供者。矿体呈脉状、透镜状产出,围岩蚀变以硅化(石英脉)、绿泥石化、次生石英岩化为主,成矿作用与岩浆活动和裂隙构造关系密切。与绿柱石(铍矿)共生的辉钼矿Re-Os同位素测年结果显示,等时线年龄为152.7±3.9 Ma,表明铍(钼)矿成矿时代为晚侏罗世,属中高温热液充填-交代型铍钼矿床,而非前人认为的火山期后热液型矿床。

Fulishi beryllium（ molybdenum） deposit in Pinghe ore bodies exists in the faults of volcanic clastic rock of Jurassic Nanyuan Formation. The lateral and hidden granite mass is the main ore-forming parent rock,and the provider of the magmatic hydrothermal and metallogenic matter. Ore bodies shape as vein or lenticular.The main surrounding rock alteration is silicify（ quartz vein）,chloritization and secondary quartzite. The mineralization is closely related to magmatic activity and fissure structure. According to the results of molybdenite Re- Os isotopic dating,the isochron age is 152. 7 ± 3. 9 Ma,showing that the beryllium（ molybdenum） ore formed in Late Jurassic,belongs to the high temperature liquid filling- metasomatic type beryllium molybdenum deposit rather than post volcanic hydrothermal deposit.