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金山金矿床成矿时代及矿床成因
Metallogenic age and genesis of Jinshan gold deposit, Jiangxi Province, China
【摘要】 金山金矿床由含金糜棱岩及含金石英脉型矿石组成。矿石的石英流体包裹体RbSr等时线年龄测定结果为406~409Ma,这两种类型矿石的年龄在测定误差范围内基本一致,属于加里东期成矿。稀土元素分布模式、S、Pb及C同位素特征、成矿流体成分资料都说明这两种类型矿石的成矿物质均来自地层,成矿流体属于地层中的建造水及大气降水,矿床应为产于加里东期脆韧剪切带中由改造作用形成的变质细碎屑岩型金矿床
【Abstract】 Jinshan gold deposit consists of two types of ore bodies, gold bearing mylonite and gold bearing quartz vein. Rb Sr isochron age of fluid inclusion in quartz from quartz veins is the same as that of gold bearing mylonite, suggesting tha t the both types of ore bodies were formed simutaneously in Caledonian period, i n range of 406~409 Ma. Geological and geochemical evidences, such as the charac teristics of REE distribution pattern, sulfur and lead isotopes, carbon, oxygen and hydrogen isotopes as well as the composition of fluid inclusions have shown that the ore forming fluids came from formational water and meteoric water, the ore forming materials came from the gold hosted rocks. Jinshan gold deposit o ccurred in Caledonian brittle ductile zones in matamorphosed microclastic rocks is owed its origin to Caledonian reworking processes.
【Key words】 gold deposit; gold bearing siliceous ultramylonite; gold bearing qu artz vein; Caledonian; metallogeny; reworking genesis; Jiangxi Province;
- 【文献出处】 地球化学 ,GEOCHIMICA , 编辑部邮箱 ,1999年01期
- 【分类号】P618.510.1,P618.510.
- 【被引频次】44
- 【下载频次】246