粤北大宝山铜多金属矿床中层状铜矿体的成矿时代与成矿物质来源研究

项目名称： 粤北大宝山铜多金属矿床中层状铜矿体的成矿时代与成矿物质来源研究

项目编号： No.41302056

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 瞿泓滢

作者单位： 中国地质科学院矿产资源研究所

项目金额： 24万元

中文摘要： 粤北大宝山铜铅锌钼钨矿床包括大宝山主体铜多金属矿床和船肚钼钨矿床两部分，前者由产于中泥盆世碳酸盐岩中的层状铜铅锌多金属矿体、产于晚泥盆世碎屑岩中的似层状和透镜状菱铁矿体以及这两类矿体之上的风化淋滤型褐铁矿体组成。对于其中的层状铜矿体成因存在两种主要观点，一是海底火山热液喷流沉积成因，二是岩浆热液成因。出现这一分歧的原因是缺乏准确的成矿年龄约束，金属来源是通过间接方法测得而且存在多解性。本项目拟以粤北大宝山铜多金属矿床中层状铜矿体为研究对象，以成矿物质来源和成矿时代为突破口，通过硫化物微区微量元素分析和碳、氢、氧、硫、铅多元同位素体系地球化学研究探讨层状铜矿体的成矿流体和成矿元素来源，采用黄铁矿Re-Os法和绢云母Ar-Ar法等同位素年代学方法厘定层状铜矿体的形成时代，对比成矿物质关联性和演化关系，并结合前人的研究成果，探讨层状铜矿体的成因。

中文关键词： 微区分析；多元同位素体系；流体包裹体；Re–Os/Ar–Ar测年；大宝山层状铜矿体

英文摘要： The Dabaoshan Cu-Pb-Zn-Mo-W deposit includes the Dabaoshan Cu polymetallic deposit and the Chuandu Mo-W deposit. The former is made up of stratiform Cu-Pb-Zn orebody, stratiform-like and lenticular siderite orebody, and weathering-infiltration type limonite orebody. The Cu-Pb-Zn orebody lies in Middle Devonian carbonate rocks, the siderite orebody lies in Late Devonian clastic rocks, and the limonite orebody lies on the two orebodies. On stratiform Cu orebody, the submarine volcanic hydrothermal sedimentation or magmatic hydrothermal genesis is the main difference. The reason is short of the precise metallogenic age. Ore-foming mineral sources are tested indirectly and there are not coincident explanations. This study takes stratiform Cu orebody from the Dabaoshan Cu polymetallic deposit in Northern Guangdong Province as an example to study ore-forming material source and metallogenic age. Sulfide micro-area trace element analysis and C, H, O, S, Pb multi-isotope system geochemistry are used to discuss ore-forming fluid source and ore-forming element source. Pyrite Re-Os dating and sericite Ar-Ar dating are used to analyze metallogenic age. Through the two aspects, we compare ore-forming material relationship and evolution history. Meanwhile, combined with previous research results and comprehensive an

英文关键词： in-situ sulfide microanalysis；multi-isotope system；fluid inclusion；Re–Os/Ar–Ar age；Dabaoshan stratiform Cu orebody