| 云南会泽矿山厂铅锌矿床流体包裹体特征及成矿物理化学条件 |
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| 引用本文： | 张艳,韩润生,魏平堂,邱文龙.云南会泽矿山厂铅锌矿床流体包裹体特征及成矿物理化学条件[J].吉林大学学报(地球科学版),2017,47(3). |
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| 作者姓名： | 张艳 韩润生 魏平堂 邱文龙 |
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| 作者单位： | 1. 昆明理工大学国土资源工程学院/有色金属矿产地质调查中心西南地质调查所,昆明,650093;2. 中国冶金地质总局昆明地质勘查院,昆明,650024 |
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| 基金项目： | 国家自然科学基金项目，云南省自然科学基金重点项目，中国地质调查局典型矿集区潜力评价示范项目，国家危机矿山矿床成矿规律研究专项，云南省矿产资源预测与评价重点工程实验室项目，云南省地质过程与矿床资源创新团队项目，昆明理工大学创新团队项目(2008)Supported by the National Natural Science Foundation of China，Main Program for the Natural Science Foundation of Yunnan Province，Demonstration Project of Potential Evaluation of Typical Concentration Area of China Geological Survey，Special Exploration Program for National Crisis Mines，Project of Key Laboratory of Mineral Resources Prediction and Evaluation of Yunnan Province，Project of Innovation Team of Geological Processes and Mineral Resources of Yunnan Province，Project of Innovation Team of Kunming University of Science and Technology |
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| 摘 要： | 通过会泽矿山厂铅锌矿床闪锌矿流体包裹体显微测温和成矿物理化学条件参数计算,结合前人研究结果,得出以下认识:会泽矿山厂铅锌矿床闪锌矿流体包裹体均一温度为126280℃,具有较宽的变化区间,盐度(w(NaCl))为3.2%22.8%;白云石流体包裹体均一温度为86163℃,大部分盐度较低,为1.1%-14.8%。3个成矿阶段闪锌矿和白云石中流体包裹体均一温度和盐度具有较明显的分布特征:从热液成矿期Ⅰ阶段→Ⅱ阶段→Ⅲ阶段→围岩蚀变,流体呈现中高温-高盐度→中温-中高盐度→中低温-中高盐度→中低温-低盐度的演化规律。在整个热液成矿过程中,有两种不同盐度的流体参与了作用,流体混合可能是矿物沉淀的主要机制。pH值计算结果表明,迁移阶段时,成矿流体呈酸性,从成矿阶段Ⅰ—Ⅳ,流体pH逐渐增大,主成矿阶段Ⅱ—Ⅲ时,闪锌矿和方铅矿在中性、弱碱性下大量析出。受控于CO、CO_2、O_2间逸度平衡的CO_3~(2-)和HCO_3~-缓冲对调节了成矿流体的pH值,碳酸盐岩在铅锌的运移沉淀中起了至关重要的作用。
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| 关 键 词： | 闪锌矿流体包裹体 物理化学条件 成矿流体 会泽矿山厂铅锌矿床 滇东北矿集区 |
Fluid Inclusion Features and Physicochemical Conditions of the Kuangshanchang Pb-Zn Deposit,Huize, Yunnan Province |
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| Zhang Yan,Han Runsheng,Wei Pingtang,Qiu Wenlong.Fluid Inclusion Features and Physicochemical Conditions of the Kuangshanchang Pb-Zn Deposit,Huize, Yunnan Province[J].Journal of Jilin Unviersity:Earth Science Edition,2017,47(3). |
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| Authors: | Zhang Yan Han Runsheng Wei Pingtang Qiu Wenlong |
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| Abstract: | Systematic researches on fluid inclusions in the sphalerite and calculation of the ore-forming physicochemical conditions, combining with previous research results, lead to the conclusions that the homogenization temperature of fluid inclusions in the sphalerite grains from the Kuangshanchang lead-zinc deposit vary from 131 to 280 ℃, with a greater change range, the salinity(w(NaCl)) between 3.2% and 22.7 %.The homogenization temperatures of fluid inclusions in the dolomite vary from 86 to 163 ℃, the salinity of most fluid inclusions vary from 1.1% to 14.8 %.There are obvious regular characteristics of homogenization temperature and salinity of fluid inclusions in the sphalerite precipitated in three metallogenic stages and the dolomite.Namely, from the hydrothermal mineralization stage I, stage Ⅱ, stage Ⅲ to the altered wall rock, the ore-forming fluid is characterized by high-moderate temperature and high salinity, moderate temperature and high-moderate salinity, moderate-low temperature and high-moderate salinity, as well as moderate-low temperature and low salinity.Moreover, there are two kinds of fluids with different salinity participating in the hydrothermal ore-forming process.The mixing of the fluids is likely to be the major mineralization mechanism.The calculated pH values show that ore-forming fluid is acidic in migration stage, whereas, from metallogenic stage I to IV, the pH value of the fluid increases gradually.In major metallogenic stage, II and III, a large number of sphalerite and galena minerals precipitated under neutral-weak alkaline condition.CO2-3 and HCO-3 buffer pair, which is controlled by the fugacity balance among CO, CO2, O2, adjusts the pH value of the ore-forming fluid.The carbonate plays a vital role in migration and precipitation of metallogenic elements of the lead and zinc. |
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| Keywords: | fluid inclusion in sphalerite physicochemical conditions ore-forming fluid Kuangshanchang lead-zinc deposit in Huize northeastern Yunnan ore concentration area |
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