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| 藏南折木朗造山型金矿成矿流体地球化学和成矿机制 | |
| 引用本文： | 周峰,孙晓明,翟伟,梁业恒,韦慧晓,莫儒伟,张相国,易建洲.藏南折木朗造山型金矿成矿流体地球化学和成矿机制[J].岩石学报,2011,27(9):2775-2785. |
| 作者姓名： | 周峰 孙晓明 翟伟 梁业恒 韦慧晓 莫儒伟 张相国 易建洲 |
| 作者单位： | 1. 中山大学地球科学系,广州,510275 2. 中山大学地球科学系,广州510275;中山大学海洋学院,广州510006;广东省海洋资源与近岸工程重点实验室,广州510275 3. 中山大学海洋学院,广州510006;3.广东省海洋资源与近岸工程重点实验室,广州510275 4. 西藏自治区地质矿产勘查开发局区域地质调查大队,拉萨,851400 |
| 基金项目： | 本文受国家重点基础研究发展规划(973)项目(2009CB421006、2002CB412610)、国家自然科学基金(40830425, 40873034,40673045)、高等学校博士学科点专项科研基金(200805580031 )和中央高校基本科研业务费专项资金(09lgpy09)联合资助. |
| 摘 要： | 折木朗金矿位于青藏高原雅鲁藏布江缝合带东段的南侧,矿体受大型脆-韧性剪切带的次级断裂控制。系统的显微测温和激光拉曼测定显示折木朗金矿矿石中存在3类流体包裹体: NaCl-H2O溶液包裹体(类型Ⅰ);含CO2盐水溶液包裹体(类型Ⅱ),此类包裹体又分为两相(Ⅱa)和三相(Ⅱb)2个小类;Ⅲ纯气相包裹体。折木朗金矿床中流体包裹体显微测温显示该矿成矿流体的盐度范围为2.31%~7.39% NaCleqv,平均值为5.33%% NaCleqv,峰值为4.0%~7.0% NaCleqv;均一温度的范围为164.5~273.1℃,峰值为220~240℃,平均值为221.0℃。相对应的密度范围为0.82~0.93g·cm-3,峰值为0.84~0.90g·cm-3,平均值为0.88g·cm-3。折木朗金矿床成矿流体具有富含CO2、低盐度、低密度、中低温度的特征,与造山型金矿成矿流体相似。此外,同位素测定显示成矿流体的氢氧碳同位素组成分别为δDH2O=-36.7‰~-107.5‰,δ18OH2O=4.1‰~5.5‰,δ13C=-9.6‰~-11.5‰,说明成矿流体主要为变质水,但有地幔流体的加入。综合成矿地质特征和成矿流体的证据,提出折木朗金矿为陆陆碰撞造山型金矿。 |
| 关 键 词： | 流体包裹体 氢氧碳同位素组成 折木朗金矿 造山型金矿 藏南 |
| 收稿时间： | 2011/3/11 0:00:00 |
| 修稿时间： | 7/8/2011 12:00:00 AM |
Geochemistry of ore-forming fluid and metallogenic mechanism for Zhemulang gold deposit in southern Tibet, China |
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| ZHOU Feng,SUN XiaoMing,ZHAI Wei,LIANG YeHeng,WEI HuiXiao,MO RuWei,ZHANG XiangGuo and YI JianZhou.Geochemistry of ore-forming fluid and metallogenic mechanism for Zhemulang gold deposit in southern Tibet, China[J].Acta Petrologica Sinica,2011,27(9):2775-2785. | |
| Authors: | ZHOU Feng SUN XiaoMing ZHAI Wei LIANG YeHeng WEI HuiXiao MO RuWei ZHANG XiangGuo and YI JianZhou |
| Institution: | Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China;Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China;School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510275, China;School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510275, China;School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510275, China;Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China;Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China;Geological Survey of Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 851400, China;Geological Survey of Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 851400, China |
| Abstract: | The Zhemulang gold deposit is located to the south of the east section of the Yarlung Zangbo tectonic suture zone in the southern Tibet.The gold ore bodies are controlled by the secondary brittle fractures of the large-scale brittle-ductile shear zone.Microthermometric measurements and Laser Raman analysis show that auriferous quartz veins of the Zhemulang gold deposit contain three types of fluid inclusions:NaCl-H2O inclusions(type I);CO2 brine inclusions(type II),which can be subdivided into two-phase(typ... |
| Keywords: | Fluid inclusion H-O-C isotopic compositions Zhemulang gold deposit Orogenic gold deposit Southern Tibet |
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