| 铜官山铜矿床矽卡岩矿物中流体包裹体及子矿物的扫描电镜研究 |
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| 引用本文：.2004.SEM/EDS Study of Daughter Minerals of Fluid Inclusions in Garnet and Diopsid e from Tongguanshan Copper Deposit [J].Mineral Deposits,23(3):375~382 |
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| 基金项目:国土资源部“大型矿集区深部精细结构与含矿信息”项目(编号：20010103) |
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| 中文摘要:通过对安徽铜官山铜矿矽卡岩矿物中的流体包裹体岩相学、包裹体显 微测温分析及子矿物的扫描电镜/能谱分析(SEM/EDS)和激光拉曼探针分析(LRM)，发现石榴 石、透辉石中的包裹体为流体包裹体，包裹体的均一温度(575～885℃)、盐度〔w(Na Cleq) 13.4%～44.9%〕均较高，流体包裹体中的子矿物有黄铜矿、闪锌矿、方解石、 菱铁矿、钾石盐和石盐，以钾石盐最为普遍，表明流体高度富钾，具岩浆热液的典型特征。 富钾流体也与该区广泛出露的燕山期高钾富碱岩体吻合。 |
| 中文关键词:地球化学 扫描电镜 流体包裹体 子矿物 富钾流体 矽卡岩 铜官山铜矿床 |
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| SEM/EDS Study of Daughter Minerals of Fluid Inclusions in Garnet and Diopsid e from Tongguanshan Copper Deposit |
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| Abstract:The Tongguanshan copper deposit in the Tongling ore belt is one of the typical s karn copper deposits. Lots of research work has been done on this ore belt. Thi s paper is focused on fluid inclusions in garnet and diopside. Three types of fl uid inclusions were recognized, namely two phase aqueous inclusions, multi_phase fluid inclusions with daughter minerals and aqueous inclusions with no bubbles. Microthermometric measurements were performed by using Linkam THMS600 heating_f reezing stage and XYD_1350 heating stage, and the results show that the ore_form ing fluids related to skarn were of high temperature (575～885℃) and high salin ity 〔13.4%～44.9% w(NaCleq)〕. Through careful observation unde r microscope, many daughter minerals comprising transparent ones and opaque ones were recognized in multi_phase fluid inclusions of garnet and diopside. Wit h SEM/EDS and LRM techniques, it is known that daughter minerals include sylvite , halite, sphalerite, clalcopyrite and carbonate. Sylvite daughter minerals are very extensively seen in garnet. The existence of so many sylvite daughter miner als and other daughter minerals in fluid inclusions indicates high salinity and high potassic concentration in ore_forming fluids. High potassic concentration i n fluid inclusions coincides with K_rich acid rock and K_silicate alteration tha t occur widely in this area. The daughter mineral association in garnet coincide s with the mineral assemblage of the post_skarn ore_forming stage. |
| keywords:geochemistry, SEM/EDS, fluid inclusion, daughter mineral, K_rich fluid, skarn, Tongguanshan copper deposit |
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