广东大宝山北部层状矿体硫化物Re-Os测年及指示

发布时间：2018-03-24 23:08

本文选题：Re-Os测年　切入点：黄铜矿　出处：《地学前缘》2017年05期

【摘要】：广东省大宝山铜多金属矿,近年来在北部新发现层状铜硫矿体,新增铜资源量20.6万吨,与采区内层状铜硫主矿体特征基本一致。为解决层状铜硫矿体的成矿时代问题,采集北部层状矿体的块状硫化物矿石样品,首次直接对黄铜矿和磁黄铁矿开展Re-Os测年,探讨成矿时代,并分析矿床成因。黄铜矿样品的Re-Os等时线年龄为(243±41)Ma(MSWD=3.1),磁黄铁矿样品的Re-Os等时线年龄为(410±16)Ma(MSWD=15),指示黄铜矿的形成可能晚于磁黄铁矿,加里东期是否存在成矿事件仍需进一步研究。黄铜矿与磁黄铁矿的矿石学研究表明,黄铜矿交代磁黄铁矿,前者形成晚于后者,结合采区地质填图结果,认为大宝山矿区及外围属于一个大的岩浆成矿系统,存在多期次岩浆侵位,主体可能属于燕山期与岩浆热液有关的成岩成矿事件。
[Abstract]:In recent years, a new layered copper-sulfur orebody has been discovered in the northern part of Guangdong Province, with a new copper resource of 206000 tons, which is basically consistent with the characteristics of the layered copper-sulfur main orebody in the mining area, in order to solve the ore-forming age problem of the layered copper-sulfur orebody. The Re-Os dating of chalcopyrite and pyrrhotite was carried out for the first time in order to discuss the metallogenic age of the massive sulfide ore samples from the stratiform ore bodies in the northern part of the world. The Re-Os isochron age of chalcopyrite samples is 243 卤41 Ma-MSWDX 3.1g, and the Re-Os isochron age of pyrrhotite samples is 410,16MaMMSWDD150.This indicates that chalcopyrite may be formed later than pyrrhotite. The results show that chalcopyrite may be formed later than pyrrhotite, and that the Re-Os isochron age of pyrrhotite samples may be lower than that of pyrrhotite. The ore-forming events in Caledonian period still need further study. The mineralogical study of chalcopyrite and pyrrhotite shows that chalcopyrite metasomatic pyrrhotite was formed later than the latter, combined with geological mapping results of mining area. It is considered that the Dabaoshan ore area and its periphery belong to a large magmatic metallogenic system with multiple magmatic emplacement and the main body may belong to the Yanshanian magmatic hydrothermal related diagenetic events.
【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实验室;中国地质科学院国家地质实验测试中心;中国地质大学(北京)地球科学与资源学院;广东省大宝山矿业有限公司;
【基金】：中国科学技术部重大仪器专项(2011YQ050069) 中国地质调查局中国矿产地质与成矿规律综合集成和服务(矿产地质志)项目(DD20160346) 国家重点研发计划课题(2016YFC0600208)
【分类号】：P597.3;P618.2

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