| 内蒙古道伦达坝铜多金属矿床成矿流体特征及其演化 |
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| 引用本文： | 徐佳佳,赖勇,崔栋,常勇,蒋林,舒启海,李文博.内蒙古道伦达坝铜多金属矿床成矿流体特征及其演化[J].岩石学报,2009,25(11):2957-2972. |
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| 作者姓名： | 徐佳佳 赖勇 崔栋 常勇 蒋林 舒启海 李文博 |
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| 作者单位： | 1. 北京大学造山带与地壳演化重点实验室,北京,100871
2. 内蒙古赤峰第十地质矿产勘察开发院,赤峰,024005 |
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| 基金项目： | 国家973项目，中国地质调查局项目 |
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| 摘 要： | 内蒙古自治区锡林郭勒盟西乌旗道伦达坝中型铜多金属矿床位于大兴安岭南段西坡,矿体主要产于粉砂质板岩与黑云母花岗岩的接触带.本文通过系统的岩相学、矿相学、流体包裹体和氢、氧同位素研究表明,道伦达坝铜多金属矿床属岩浆期后气化热液矿床,成矿过程包括早、中、晚3个阶段,温度区间分别为388～＞500℃、302～463℃、179～359℃.钨-锡矿化主要发生在中阶段、铜矿化主要发生在晚阶段.初始成矿流体为CH_4-CO_2-H_2O-NaCl体系,随着温压降低,CO_2、CH_4大量逸失,而演化为H_2O-NaCl体系.流体盐度变化范围大,但从早到晚逐步降低.流体临界分离导致钨、锡矿化;流体CH_4、CO_2逃逸和大气降水热液混入导致铜矿化.黑云母花岗岩的侵入活动导致了成矿流体的聚集,而粉砂质板岩有利于成矿流体封闭,致使二者接触带成为有利的成矿和找矿部位.
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| 关 键 词： | 流体包裹体 氢氧同位素 成矿流体 道伦达坝铜多金属矿 内蒙古 |
Characteristics and evolution of ore-forming fluids of the Daolundaba copper-poly-metal deposit, Inner Mongolia |
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| XU JiaJia,LAI Yong,CUI Dong,Chang Yong,Jiang Lin,Shu QiHai,LI WenBo.Characteristics and evolution of ore-forming fluids of the Daolundaba copper-poly-metal deposit, Inner Mongolia[J].Acta Petrologica Sinica,2009,25(11):2957-2972. |
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| Authors: | XU JiaJia LAI Yong CUI Dong Chang Yong Jiang Lin Shu QiHai LI WenBo |
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| Abstract: | The Daolundaba medium-sized Copper-poly-metal deposit in Xiwuzhumuqin Qi,Xilinguole City,Inner Mongolia,occurs in the western Great Xing'an Range.Ore-bodies are mainly hosted in the contact zone between a biotite granite and a silty slate.The study in ore petrography and fluid inclusions and hydrogen oxygen isotope geochemistry shows that the Daolundaba deposit was formed by post-magmatic hydrothermaI process.Hydrothermal mineralization are divided into the early,middle and late stages with homogenization temperatures of 388～＞ 500℃,302～463℃ and 179～359℃,respectively.W and Sn mineralization occurred in the middle stage,while the Cu mineralization mainly occurred in the late stage.The ore-forming fluid was originally a CH_4-CO_2-H)_2O-NaCl system,and evolved into a H_2O-NaCl system through release of CH_4 and CO_2 along with decreasing temperature and pressure.The fluid salinity was widely variable,but decreased from early to late.The vapor-brine phase separation resulted in mineralization of W and Sn;and the CH_4 and CO_2 escape and the input and mixing of meteoric water caused Cu deposition.During the hydrothermal mineralization,the biotite granite wall-rock and silty slate served as seal and container to trap ore-fluids,respectively.This makes the granite-slate contact zones to be key positions for metallic mineralization and future ore exploration. |
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| Keywords: | Fluid inclusions Hydrogen and oxygen isotopes Ore-forming fluids Daolundaba copper-poly-metal deposit Inner Mongolia |
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