摘要
梨木岭钼矿床是近年来新发现的钼矿,也是目前大别山构造带唯一具有工业意义的中型钼矿床。通过辉钼矿Re-Os同位素年代学测定,获得梨木岭钼矿Ⅰ矿脉5件样品辉钼矿的Re-Os模式年龄为(115.3±1.4)Ma^(118.1±1.5)Ma,加权平均年龄为(116.8±1.3)Ma;等时线年龄为(119.9±6.2)Ma(MSWD=1.6)。Ⅱ矿脉2件辉钼矿Re-Os模式年龄分别为(114.7±1.6)Ma和(117.0±1.4)Ma。两条矿脉中辉钼矿样品的Re-Os模式年龄在误差范围内一致,表明这两条矿脉为早白垩世同期热液产物。梨木岭钼矿床可能为与早白垩世中酸性岩浆活动有关的岩浆热液型矿床。早白垩世大别山钼成矿作用不仅仅局限在北大别的北淮阳构造带,在大别山南麓同样存在该阶段钼成矿作用。
The Limuling molybdenum deposit in southern Dabie area consists of quartz-sulfide veins. Re-Os dating of five molybdenite samples in No. Ⅰ orebody yielded model ages ranging from（115. 3 ± 1. 4） Ma to（118. 6 ± 1. 5）Ma,with an average of（116. 8 ± 1. 3） Ma. Two molybdenite samples in No. Ⅱ orebody yielded model ages of（114. 7 ± 1. 6） Ma and（117. 0 ± 1. 4） Ma,respectively. The Re-Os ages of the two ore bodies are identical within the error,suggesting that they were formed in the Early Cretaceous. These new data,combined with geochronological results available from the other molybdenum deposits in northern Huaiyang region,imply that magmatism and Mo mineralization occurred in the Tongbai-Dabie belt during the Early Cretaceous.
出处
《矿床地质》
CAS
CSCD
北大核心
2017年第4期992-1002,共11页
Mineral Deposits
基金
中国地质调查局地质大调查项目(编号:DD20179232)和(编号:1212011220515)联合资助的成果
