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为了确定闽西南地区铁矿床成矿时代及主要成矿作用特征,选取洛阳铁矿床开展花岗岩LA-ICP-MS锆石U-Pb同位素测龄及辉钼矿Re-Os同位素年代学研究.结果表明洛阳铁矿床中辉钼矿Re-Os同位素模式年龄为(133.0±1.9)～(134.0±4.2)Ma,为早白垩世成矿.矿区花岗斑岩结晶年龄为131±1Ma,细粒斑状花岗岩结晶年龄为131.64±0.62Ma,说明岩体都形成于早白垩世.通过对洛阳铁矿床花岗岩、磁铁矿体及辉钼矿体空间分布规律及矿化蚀变特征综合分析,结合岩体与矿床年代学结果,可以得出洛阳铁矿床主要形成于早白垩世,与早白垩世花岗岩岩浆热液接触交代石炭纪碎屑岩-碳酸盐岩地层密切相关.
In order to determine the metallogenic epoch and the main metallogenic characteristics of the iron ore deposits in southwestern Fujian, the LA-ICP-MS zircon U-Pb dating of granite and the Re-Os isotopic dating of molybdenite were selected for the Luoyang iron deposit. The results show that the Re-Os isotopic model age of the molybdenite in Luoyang Iron Deposit is (133.0 ± 1.9) ~ (134.0 ± 4.2) Ma, which is the Early Cretaceous mineralization.The granite porphyry in the ore district is 131 ± 1Ma in age The granite-like granites have a crystallization age of 131.64 ± 0.62Ma, indicating that the rock mass was formed in the Early Cretaceous.By comprehensive analysis of the spatial distribution and mineralization alteration of granite, magnetite and molybdenite in the Luoyang iron deposit, The results of geochronology and geochronology indicate that the Luoyang iron deposit is mainly formed in the Early Cretaceous and is closely related to the Early Cretaceous granitic magmatic hydrothermal contact to account for the Carboniferous clastic rock-carbonate formation.