| 江西金山金矿床成矿物质来源的铅和硫同位素示踪 |
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| 引用本文： | 曾键年,范永香,林卫兵.江西金山金矿床成矿物质来源的铅和硫同位素示踪[J].现代地质,2002,16(2):170-176. |
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| 作者姓名： | 曾键年 范永香 林卫兵 |
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| 作者单位： | 中国地质大学汉口分校,湖北武汉,430030 |
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| 基金项目： | 高等学校博士学科点专项科研基金 ( 95 49112 ) |
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| 摘 要： | 江西金山金矿床赋存于浅变质的中元古界双桥山群上亚群 ,该建造明显富Au ,Au平均丰度达 2 5 5× 10 -9。矿石铅同位素组成出现明显的线性关系表明 ,区域构造活动 成矿作用中存在着铅同位素的混合机制。大部分矿石铅Doe单阶段模式年龄与该矿床的Rb Sr年龄值十分接近 ,可能反映了区域变质的成矿意义。矿石铅 μ值介于 9 2 9～ 9 86之间 ,2 3 2 Th/ 2 3 8U比值变化于 3 88～ 4 0 9,揭示了成矿物质的壳源特征。Zartman图解和△γ △ β图解表明 ,双桥山群是矿石铅的主要源区。该矿床硫同位素组成特征与外围双桥山群上亚群中硫化物的硫同位素极为相似 ,成矿流体的硫主要来源于双桥山群含矿建造。对比研究表明 ,虽然不同金矿床的硫同位素组成特征不尽相同 ,但金山金矿床的层控特征与江南金成矿带中其他金矿极为相似。金山金矿床的铅、硫同位素地球化学特征揭示 ,该矿床的成矿物质主要来自浅变质的中元古界双桥山群含金建造 ,燕山期岩浆热液活动为该矿床的后期富集提供了部分成矿物质。
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| 关 键 词： | 铅、硫同位素 金矿床 成矿物质来源 双桥山群 金山 江西 |
| 文章编号： | 1000-8527(2002)02-0170-07 |
| 修稿时间： | 2002年1月28日 |
THE LEAD AND SULFUR ISOTOPIC TRACING OF THE SOURCE OF ORE-FORMING MATERIAL IN JINSHAN GOLD DEPOSIT IN JIANGXI PROVINCE |
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| ZENG Jian nian,FAN Yong xiang,LIN Wei bing.THE LEAD AND SULFUR ISOTOPIC TRACING OF THE SOURCE OF ORE-FORMING MATERIAL IN JINSHAN GOLD DEPOSIT IN JIANGXI PROVINCE[J].Geoscience——Journal of Graduate School,China University of Geosciences,2002,16(2):170-176. |
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| Authors: | ZENG Jian nian FAN Yong xiang LIN Wei bing |
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| Abstract: | Jinshan gold deposit in Jiangxi Province is hosted by upper sub group of the Shuangqiaoshan Group of the Mid Proterozoic which is light metamorphic. The upper sub group of the Shuangqiaoshan Group is rich in Au and the average content of Au in it is up to 25 5×10 -9 . Obvious linear relationship of lead isotopic compositions of the ores exposes mixed machanism of lead isotopics in the regional structure activities and minerallization. The Doe single model age of the most ore lead is similar to the Rb Sr age of the deposit . And this may show the functions of ore forming in the regional metamorphism. The μ values of ore lead are between 9 29 and 9 86, and 232 Th/ 238 U are between 3 88 and 4 09. These data show the crust source characteristics of ore forming material. The diagrams of Zartman and △ γ △ β reveal that the Shuangqiaoshan Group is the main source area of ore lead. The characteristics on sulfur isotopic composition in Jinshan gold deposit are similar to that in upper sub group formation of the Shuangqiaoshan Group . The quantitative studies on sulfur isotopic discover that the sulfur in ore forming fluid mainly come from the Shuangqiaoshan Group. Even though the characteristics of sulfur isotopic composition are different in different gold deposits, the characteristics of stratabound in Jinshan gold deposit are similar to those of other gold deposits of Jiangnan gold metallogenetic belt . The geochemical characteristics of lead and sulfur isotopics in Jinshan gold deposit show that the main ore forming material came from the gold bearing formation of the Shuangqiaoshan Group,and the magmatic hydrothermalism of the Yanshanian period also offered some ore forming material which caused enrichment and superimposed on this deposit. |
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| Keywords: | lead and sulfur isotope gold deposit source of ore forming material the Shuangqiaoshan Group Jinshan Jiangxi Province |
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