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| 黑龙江省铜山斑岩铜矿床流体包裹体研究 | |
| 引用本文： | 武广,刘军,钟伟,朱明田,糜梅,万秋.黑龙江省铜山斑岩铜矿床流体包裹体研究[J].岩石学报,2009,25(11):2995-3006. |
| 作者姓名： | 武广 刘军 钟伟 朱明田 糜梅 万秋 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,成矿动力学重点实验室,广州,510640;中国地质科学院矿产资源研究所,北京,100037 2. 中国科学院广州地球化学研究所,成矿动力学重点实验室,广州,510640;中国科学院研究生院,北京,100049 3. 中国科学院广州地球化学研究所,成矿动力学重点实验室,广州,510640 4. 合肥工业大学资源与环境工程学院,合肥,230009 |
| 基金项目： | 国家973计划项目2006CB403508课题、国家自然科学基金项目40772055、国家科技支撑计划项目2007BAB25B03课题的资助 |
| 摘 要： | 铜山大型铜矿床位于小兴安岭西北部,是中亚-兴蒙造山带北东段最著名的斑岩型铜矿床之一,矿体产于加里东期花岗闪长岩和中奥陶世多宝山组安山岩、凝灰岩中,铜矿化与硅化-绢云母化关系密切.流体包裹体研究表明,铜山铜矿床主要发育气液两相包裹体、含CO_2包裹体和含子矿物多相包裹体.成矿流体在形成过程中经历了早、中、晚3个阶段的演化.成矿早阶段发育气液两相水溶液包裹体和少量含子矿物多相包裹体,均一温度介于420℃～＞5500C之间,流体盐度介于13.72 wt%～59.76 wt%NaCl eqv之间;中阶段为铜山矿床的主成矿阶段,发育气液两相水溶液包裹体和含CO_2包裹体,均一温度为241℃～417℃,流体盐度介于2.96 wt%～14.04 wt%NaCl eqv之间,主成矿期成矿流体总体上属H_2O-CO_2-NaCl体系;晚阶段仅发育气液两相水溶液包裹体,均一温度为122℃～218℃,盐度介于3.71 wt%～15.96 wt%NaCl eqv之间,表明晚阶段有大气降水的混入.成矿早、中阶段的流体均为不混溶流体,流体沸腾作用是金属硫化物大量沉淀的主要机制.铜山矿床形成于陆缘弧环境. |
| 关 键 词： | 流体包裹体 沸腾作用 铜山斑岩铜矿床 黑龙江省 小兴安岭 |
Fluid inclusion study of the Tongshan porphyry copper deposit, Heilongjiang province, China |
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| WU Guang,LIU Jun,ZHONG Wei,ZHU MingTian,MEI Mei,WAN Qiu.Fluid inclusion study of the Tongshan porphyry copper deposit, Heilongjiang province, China[J].Acta Petrologica Sinica,2009,25(11):2995-3006. | |
| Authors: | WU Guang LIU Jun ZHONG Wei ZHU MingTian MEI Mei WAN Qiu |
| Abstract: | The large-sized Tongshan porphyry copper deposit is located in the northwestern part of Lesser Hinggan Range,which is one of the most famous porphyry copper deposits in the northeast section of Central Asian-Mongolian-Hinggan orogenic belt.Its copper orebodies are mainly hosted in Caledonian granodiorite and Middle Ordovician Dubaoshan Formation andesite and tuff.Copper mineralization is closely associated with silicifieation and sericitization.In quartz veins three types of fluid inclusions are distinguished,namely aqueous two-phase,CO_2-bearing phase and daughter mineral-bearing multiphase inclusions.The evolution of the hydrothermal mineralization system includes three stages.Fluid inclusions of the early stage in quartz are mainly aqueous two-phase inclusion with minor daughter mineral-bearing multiphase inclusion,their homogenization temperatures and salinities vary from 420℃ to ＞ 550℃ and from 13.72 wt% to 59.76 wt% NaCl equivalent,respectively.The middle-stage fluid inclusions are mainly composed of aqueous twophase inclusion and CO_2-bearing phase inclusion,their homogenization temperatures and salinities vary from 241 ℃ to 417℃ and from 2.96 wt% to 14.04 wt% NaCl equivalent,respectively.The middle stage is main stage of ore-forming material enrichment,with affinities to H_2O-CO_2-NaCl fluid system.The late-stage fluid inclusions are characterized by aqueous two-phase inclusion,with homogeneous temperatures of 122℃ to 218℃ and salinities of 3.71 wt% to 15.96 wt% NaCl equivalent respectively,suggesting that this stage of ore-forming fluid is significantly mixed with meteoric water.Both early-and middle-stage fluids belong to immiscibility fluid,and the boiling action of ore-forming fluid is the dominant factor for metallic sulfide deposition.We conclude that the Tongshan porphyry copper deposit may occur in continental arc. |
| Keywords: | Fluid inclusion Fluid boiling Tongshan porphyry copper deposit Heilongjiang province Lesser Hinggan Range |
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