Properties, Origin and Evolution of Ore-forming Fluids from Longhua Ni-Co Deposit, Jinxiu County, Guangxi
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摘要: 广西金秀县龙华镍钴矿床是近年来获得较多关注的热液型镍钴矿床，对于其形成过程，尤其是成矿流体来源与演化方面的详细报道较少。龙华镍钴矿床的矿化过程从早到晚可分为石英-红砷镍矿-辉砷镍矿、石英-辉砷镍矿、石英-镍黄铁矿-黄铁矿等三个成矿阶段，对代表成矿各阶段的伴生透明矿物石英中的流体包裹体进行了岩相学观察及显微测温，结果显示龙华镍钴矿床早成矿阶段流体均一温度为121～235℃，盐度主要为7.86～35.87 wt% NaCl，主成矿阶段均一温度为135～223 ℃，盐度主要为13.77～35.87 wt% NaCl.，晚成矿阶段均一温度为96～180 ℃，盐度为3.21～26.64 wt% NaCl。成矿流体具有中低温、中高盐度特征，结合成矿流体的氢氧同位素组成特征，初步判断矿床成矿流体主要来源于循环萃取了富镍地层中成矿物质的大气降水演变而成的含矿热卤水，同时混合有少量岩浆水和大气水，流体混合和流体冷却作用是导致该矿床镍钴矿物沉淀的重要因素。金秀镍钴矿床属新型中低温、中高盐度的热液充填型镍钴矿床。Abstract: The Longhua Ni-Co deposit in Jinxiu County is a hydrothermal Ni-Co deposit that has attracted considerable attention in recent years. There are seldom detailed reports on its formation process, especially on the origin and evolution of the ore-forming fluids. The ore-forming process in the Longhua deposit can be divided into at least three stages, aka quartz - nickeline - gersdorffite stage, quartz - gersdorffite stage, quartz - pentlandite - pyrite stage, the fluid inclusions in the associated transparent mineral quartz representing each mineralization stage have been observed by petrography and micro thermometry. The fluid homogenization temperature during the early mineralization stage of the Longhua Ni-Co deposit is 121~235 ℃, with salinity mainly ranging from 7.86 wt% NaCl to 35.87 wt% NaCl. The homogenization temperature during the main mineralization stage is 135~223 ℃, with salinity mainly ranging from 13.77 wt% NaCl to 35.87 wt% NaCl. The homogenization temperature during the late mineralization stage is 96~180℃, and the salinity is 3.21~26.64 wt% NaCl. The ore-forming fluid shows the characteristics of low to medium temperature and medium to high salinity. Combined with the hydrogen and oxygen isotope characteristics, it could be indicated that the ore-forming fluid is mainly derived from the ore-bearing hot brine that evolved from atmospheric precipitation that circulates and extracts the ore-forming materials from the Ni-rich strata, mixed with a small amount of magma and atmospheric water, and the fluid mixing and fluid cooling are the important factors leading to the precipitation of Ni-Co minerals in the deposit. The Jinxiu Ni-Co deposit belongs to a new type of hydrothermal filling deposit with low to medium temperature and high salinity.
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Key words:
- ore-forming fluid /
- fluid evolution /
- ore genesis /
- Longhua Ni-Co deposit /
- Jinxiu County, Guangxi
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