| 梁业恒.江苏观山高硫型铜铅金矿床稳定同位素
地球化学和成因意义[J].地质与勘探,2010,46(4): |
| 江苏观山高硫型铜铅金矿床稳定同位素
地球化学和成因意义 |
| Stable Isotopic Geochemistry and Genesis of the Guanshan High-SulphidationType Cu-Pb-Au Deposit in Jiangsu Province |
| 投稿时间：2010-02-03 修订日期：2010-07-01 |
| DOI： |
| 中文关键词: 稳定同位素摇浅成低温热液矿床摇观山铜铅金矿摇成矿溶液 |
| 英文关键词: Stable isotope,Epithermal deposit,Guanshan Cu-Pb-Au deposit,Ore-forming fluids |
| 基金项目:江苏省有色金属华东地质勘查局委托研究项目(编号: 32110-4206243)和中央高校基本科研业务费专项基金资助 |
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| 中文摘要: |
| [摘要]江苏观山铜铅金矿是典型的高硫型浅成低温热液矿床。本文通过对观山铜铅金矿床氢、
氧、碳、硫同位素组成的研究,探讨成矿溶液中水、碳、硫的来源以及成矿溶液的演化。同位素测定显示
石英流体包裹体水的啄D=-90译~ -70译,啄18 O水=-8. 9译~ -1. 1译;热液方解石流体包裹体水的啄D=-
90译~ -81译,啄18 O水=0. 1译~2. 3译。氢氧同位素组成说明成矿流体主要为与围岩进行过水岩反应的
循环大气降水, 不排除有少量岩浆水的加入。黄铁矿与黄铜矿矿石的啄34 SV-CDT =5. 8译~9. 9译,平均值
为7. 6译,表明该矿成矿过程中的S 很可能是沉积岩来源的硫与岩浆岩来源硫的混合。矿床中可见较多
的重晶石等硫酸盐矿物,这种高价态硫的矿物的存在显示其成矿溶液具有富集34 S 的特征,加上成矿过
程中流体的沸腾导致H2 S 等气体大量逸出和残余岩浆流体富集34 S,使得沉淀的黄铁矿、黄铜矿等硫化
物同样具有富集34 S 的特征;热液方解石碳同位素啄13 C方解石= -4. 1译~ 6. 1译,平均为啄13 C方解石=1. 3译,
显示其中的C 主要来源于流体对流循环过程中对基底岩石中碳酸盐地层的溶解。 |
| 英文摘要: |
| Abstract:The Guanshan Cu-Pb-Au deposit in Jiangsu Province is a high-sulphidation type epithermal poly-metallic deposit. This work studies the
stable isotope compositions of ore minerals and fluid inclusions,the sources of ore-forming fluid and materials. The result shows that the 啄D and 啄18 Oof
fluid inclusions in quartz veins range from -90译to -70译and -8. 9译to -1. 1译,respectively,while those of the hydrothermal calcites are -90译~ -
81译and 0. 1译~ 2. 3译,respectively,indicating that the ore-forming fluids stem mainly from cycling atmospheric precipitation and a little amount of
magmatic water. The sulfur isotope of chalcopyrites and pyrites range from 5. 8译to 9. 9译,with average 7. 6译,suggesting that the sulfur is probably de鄄
rived partly from sedimentary rocks. Plenty of sulfates such as barites can be found in Guanshan implies the enrichment of 34 S in the ore-forming fluids.
Along with the boiling of ore-forming fluids, it resulted in degassing of trace gases such as H2 S,and enrichment of 34 S in the residual magmatic fluids,and
deposited pyrites and chalcopyrites enriched in 34 S. 啄13 C of hydrothermal calcites are -4. 1译~ 6. 1译with average 1. 3译,implying that the primary
source of the carbon in the ore-forming fluids is the dissolved carbonate formation in the basement rocks. |
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