粤西河台金矿床富硫化物含金石英脉锆石U-Pb测年及成矿意义  

U-Pb Isotope Age of Zircons in Gold-bearing Quartz Veins from the Hetai Gold Deposit, Western Guangdong, China: Constraints on the Timing of Gold Metallogenesis

作　　者：翟伟[1,2] 袁桂邦[3] 李兆麟[1] 黄栋林[4] 文拥军[1] 

机构地区：[1]中山大学地球科学系 [2]南京大学内生金属矿床成矿机制研究国家实验室,210093 [3]天津地质矿产研究所 [4]广东高要河台金矿

出　　处：《地质论评》2005年第3期340-346,共7页Geological Review

基　　金：国家自然科学基金资助项目 (编号 40 3 73 0 2 7;49873 0 18);广东省自然科学基金资助项目 (编号 0 0 12 5 5 )的成果

摘　　要：河台金矿是一个强烈受韧性剪切带控制的金矿床,金的成矿主要发生在热液蚀变成矿期的金石英脉阶段和金硫化物阶段,形成的矿石有蚀变糜棱岩型和富硫化物石英脉型。富硫化物含金石英脉中单颗粒锆石U- Pb同位素测年显示早加里东期是河台金矿床主成矿期,成矿年龄为4 92±16 Ma;矿区燕山期伍村花岗岩的单颗粒锆石年龄为15 3.6±2 .1Ma;结合已有的同位素资料,认为河台金矿床是华南加里东期构造—变质—岩浆作用及成矿作用的一个组成部分,是一个早加里东期造山作用同期的造山带型金矿床,并可能有燕山期的热液叠加成矿作用。The Hetai gold deposit is strictly controlled by ductile shear zones. Gold mineralization occurred mainly in the gold quartz vein stage and the gold sulfide stage of the hydrothermal alteration mineralization epoch. The two types of ore are altered mylonites and sulfide-rich quartz veins. A U-Pb isotope age of individual zircon grains in sulfide-rich gold-bearing quartz veins show that the early Caledonian is the main mineralization epoch, and the metallogenetic age is 492±16Ma. A U-Pb isotopic age of individual zircon grains of the Yanshanian Wucun granite in the mineral deposit region is 153.6±2.1Ma. Combining the isotopic data of previous studies, we hold that the Hetai gold deposit is one component part of the product of tectonism, metamorphism, magmatism and metallogenesis of the South China orogenic belt, and is an orogenic gold deposit that formed in a synorogenic period in the early Caledonian. The deposit suffered hydrothermal overprinting in the Yanshanian period.

关 键 词：金矿床 成矿作用 富硫化物含金石英脉 单颗粒锆石 U-PB同位素 成矿年龄 区域构造作用 地质条件 

分 类 号：P618.51[天文地球—矿床学]