| 西藏曲水县色甫金铜矿成矿流体性质与来源 |
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| 引用本文： | 李应栩,宋旭波,李光明,向安平,兰熙阳,张林奎,次仁桑布,曹华文.西藏曲水县色甫金铜矿成矿流体性质与来源[J].地球科学,2019,44(6):2017-2038. |
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| 作者姓名： | 李应栩 宋旭波 李光明 向安平 兰熙阳 张林奎 次仁桑布 曹华文 |
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| 作者单位： | 1.中国地质调查局成都地质调查中心, 四川成都 610081 |
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| 基金项目： | 国家重点研发计划项目2016YFC0600308中国地质调查局地质调查项目DD20190147国家自然科学基金资助项目41702086国家重点基础研究发展计划2011CB403105 |
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| 摘 要： | 色甫金铜矿是新近在冈底斯南缘新生代斑岩成矿带内揭示的一个叠加于热液脉型铜矿上的浅成低温热液型金矿.详细的野外地质调查显示,色甫金铜矿和邻近的鸡公西矿区范围内先后经历了早始新世磁铁矿化、晚始新世-早渐新世与韧性剪切活动有关、早中新世钼矿化和铜矿化以及稍晚的金矿化等多期热液活动.对各期流体活动形成的石英中流体包裹体的岩相学、显微测温、显微激光拉曼和氢-氧同位素分析显示,与磁铁矿化有关的流体为岩浆热液混合建造水的高温、高盐度富水流体;与钼矿化有关的流体为岩浆热液与大气降水混合的高温、高盐度富水流体;与铜矿体形成有关的流体为具有岩浆贡献的中高温含CO2低盐度流体与大气降水来源的低温低盐度富水流体混合的产物;与金矿体形成有关的流体为具有岩浆贡献的中温含CO2±CH4±N2的中低盐度流体与大气降水来源的低温低盐度富水流体混合的产物.利用流体包裹体显微测温对其捕获温压估算的结果显示,铜矿体和钼矿化体形成前,该地区有过1.5~4.1 km的剥蚀,之后至金矿体形成前时有过近6 km的剥蚀,金矿体形成后剥蚀为0.8~1.2 km.矿区后续工作应优先针对近南北向断裂中赋存的蚀变岩型金矿开展工作.
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| 关 键 词： | 冈底斯斑岩成矿带 色甫金铜矿 成矿流体 成矿深度 矿床 |
| 收稿时间： | 2018-08-11 |
Properties and Sources of Ore-Forming Fluids in Sefu Gold-Copper Deposit,Quxu County,Tibet, China |
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| Li Yingxu,Song Xubo,Li Guangming,Xiang Anping,Lan Xiyang,Zhang Linkui,Ciren Sangbu,Cao Huawen.Properties and Sources of Ore-Forming Fluids in Sefu Gold-Copper Deposit,Quxu County,Tibet, China[J].Earth Science-Journal of China University of Geosciences,2019,44(6):2017-2038. |
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| Authors: | Li Yingxu Song Xubo Li Guangming Xiang Anping Lan Xiyang Zhang Linkui Ciren Sangbu Cao Huawen |
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| Affiliation: | (Chengdu Centre of China Geological Survey,Chengdu 610081,China;College of Earth Science,Chengdu University of Technology,Chengdu 610059,China;Tibet Wujcin Mining Co.,Ltd.,Lhasa 851418,China;Sijcth Geological Brigade of Tibet Autonomous Region Geological and Mineral Exploration and Development Bureau .Lhasa 851400,China) |
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| Abstract: | Sefu deposit is a newly discovered Au-Cu deposit in Gangdese porphyry Cu belt. Its Au orebodies are epithermal type and superimposed on the vein type Cu orebodies. According to detailed geological survey, five periods of hydrothermal activity are distinguished in and around Sefu and Jigongxi. They are Early Eocene magnetite mineralization, Late Eocene-Early Oligocene ductile shearing related one, Early Miocene molybdenum and copper mineralization, and gold mineralization at last. Petrography, microthermometry, laser Raman spectroscopy together with hydrogen and oxygen isotope analysis are conducted on the fluid inclusions in quartz formed during these five periods. It is found that fluid related to magnetite mineralization is the mixture of magma originated aqueous fluid of high temperature, high pressure, high salinity, and formation water. Fluid related to molybdenum mineralization is the mixture of meteoric water and magma originated aqueous fluid of high temperature, high pressure, and high salinity. Fluid related to copper mineralization is the mixture of medium-high temperature, low salinity fluid and containing medium density CO2, which was originated from magma, and low temperature, low salinity fluid which is from meteoric water. Fluid related to gold mineralization is the mixture of medium temperature, low salinity fluid with low density CO2, CH4 and N2, which was originated from magma, and medium temperature, low salinity fluid, which is from meteoric water. Estimation results of trapping temperature and pressure based on microthermometry also show 1.5-4.1 km erosion had happened before molybdenum and copper mineralization, and 6 km erosion had happened before gold mineralization. After gold mineralization, 0.8-1.2 km erosion had happened. Exploration should focus more on gold orebodies in the near north-south striking faults in Sefu area in future. |
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| Keywords: | Gangdese porphyry metallogenic belt Sefu gold-copper deposit ore-forming fluid mineralization depth deposits |
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