广东锡坪钼铜多金属矿床辉钼矿Re-Os同位素定年及其地质意义

发布时间：2018-04-01 16:20

本文选题：辉钼矿　切入点：Re-Os同位素定年　出处：《岩石学报》2017年03期

【摘要】：广东锡坪钼铜多金属矿床位于钦杭成矿带的西南端,为一大型的斑岩型矿床。本文利用辉钼矿Re-Os同位素定年方法对锡坪钼铜多金属矿床4件辉钼矿样品进行了成矿年代学测定,获得的模式年龄为85.15~88.34Ma,加权平均值为86.1±2.3Ma,对应的等时线年龄为89.9±3.4Ma,模式年龄和等时线年龄结果在误差范围内基本一致,指示锡坪钼铜多金属矿床的成矿时限为晚白垩世。锡坪钼铜多金属矿辉钼矿样品的Re含量较低,表明其成矿物质可能主要来自于壳源。钦杭成矿带成岩成矿作用以中生代燕山期为主,存在180~150Ma、110~80Ma两个爆发期,两期成岩成矿作用可能均与太平洋板块的俯冲有一定的关系。锡坪钼铜多金属矿床是在岩石圈伸展减薄环境下发生的大规模成矿作用的产物。
[Abstract]:The Xiping molybdenum copper polymetallic deposit, located at the southwest end of the Qinghang metallogenic belt, is a large porphyry deposit. In this paper, the metallogenic chronology of four molybdenum samples from the Xiping molybdenum copper polymetallic deposit has been studied by using the Re-Os isotopic dating method. The model age is 85.15 ~ 88.34 Ma, the weighted average is 86.1 卤2.3 Ma, and the corresponding isochron age is 89.9 卤3.4 Ma.The results of model age and isochron age are basically consistent within the error range. It indicates that the metallogenic time of Xiping molybdenum copper polymetallic deposit is late Cretaceous. The re content of molybdenum samples from Xiping molybdenum copper polymetallic ore deposit is relatively low. It is suggested that the ore-forming materials mainly come from the crust source. The diagenesis of Qinghang metallogenic belt is dominated by the Yanshanian period of Mesozoic, and there are two eruptive periods of 180 ~ 150 Ma and 110 ~ 80 Ma, respectively, in the Qinghang metallogenic belt. Both diagenesis and mineralization may be related to the subduction of the Pacific plate. The Xiping molybdenum copper polymetallic deposit is the product of large-scale mineralization in the lithospheric extensional thinning environment.
【作者单位】：中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点开放实验室;国土资源部科技与国际合作司;中国地质调查局发展研究中心;国土资源部矿产勘查技术指导中心;广东省地质调查院;广东省有色金属地质局;
【基金】：国土资源部成矿作用与资源评价重点实验室开放基金项目(ZS1503) 国家自然科学基金项目(41430314、41203036)联合资助
【分类号】：P618.2;P597.3

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