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 (5 75～ 885℃ )、盐度〔w(NaCleq) 13.4 %～ 4 4 .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。
The Tongguanshan copper deposit in the Tongling ore belt is one of the typical skarn copper deposits. Lots of research work has been done on this ore belt. This paper is focused on fluid inclusions in garnet and diopside. Three types of fluid 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_freezing stage and XYD_1350 heating stage, and the results show that the ore_forming fluids related to skarn were of high temperature (575～885℃) and high salinity 〔13.4% ～44.9% w (NaCl eq )〕. Through careful observation under microscope, many daughter minerals comprising transparent ones and opaque ones were recognized in multi_phase fluid inclusions of garnet and diopside. With 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 minerals and other daughter minerals in fluid inclusions indicates high salinity and high potassic concentration in ore_forming fluids. High potassic concentration in fluid inclusions coincides with K_rich acid rock and K_silicate alteration that occur widely in this area. The daughter mineral association in garnet coincides with the mineral assemblage of the post_skarn ore_forming stage.
出处
《矿床地质》
CAS
CSCD
北大核心
2004年第3期375-382,共8页
Mineral Deposits
基金
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 :2 0 0 10 10 3 )资助
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
geochemistry, SEM/EDS, fluid inclusion, daughter mineral, K_rich fluid, skarn, Tongguanshan copper deposit
