| 王艳丽,祝新友,程细音,李顺庭.湖南瑶岗仙两类钨矿成矿流体对比研究[J].矿产勘查,2014,5(5):728-737 |
| 湖南瑶岗仙两类钨矿成矿流体对比研究 |
| Comparative study of the ore-forming fluids in the two types of tungsten deposits in Yaogangxian,Hunan |
| 投稿时间：2013-11-16 |
| DOI： |
| 中文关键词: 湖南 瑶岗仙 黑钨矿 白钨矿 成矿流体 |
| 英文关键词: wolframite deposit scheelite deposit ore-forming fluids Yaogangxian Hunan |
| 基金项目:国家科技支撑课题(编号:2011BAB04B08)和老矿山深部和外围找矿项目(编号:资[2013]01-036-049)联合资助。 |
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| 中文摘要: |
| 湖南瑶岗仙钨矿田由夕卡岩型白钨矿矿床和石英脉型黑钨矿矿床组成,分别位于瑶岗仙花岗岩体的东南侧和北西侧。文章从成矿流体的演化特点、流体成分以及流体来源方面,探讨了两类钨矿化的区别,并讨论成矿地质条件及流体成分对矿化的控制。研究认为,脉型黑钨矿形成于封闭系统,成矿流体呈临界状态,为一种介于岩浆与热液之间的过渡性流体,该流体的形成与岩浆的熔离及分异作用有关,成矿流体主要为来自岩浆的中高温、中低盐度,富含CO2、CH4以及H2S的卤水。而白钨矿化形成于开放环境,流体演化过程中混合作用明显,其来源早期以岩浆水为主,后期有大量天水的加入。除了围岩性质不同,两类钨矿化对应的流体性质也是形成不同类型钨矿化的另一重要因素。 |
| 英文摘要: |
| The Yaogangxian tungsten deposit district consists of skarn-type scheelite and quartz vein type wolframite deposits, the first type deposit is located in the southeastern Yaogangxian granite while the second type deposit located in the northwestern part. This paper discusses the difference between tungsten mineralization and the mineralization controlled by geological conditions and fluid composition from aspects of the evolution characteristics of ore-forming fluids, fluid composition, and fluid sources. The study result indicated that the vein-type wolframite deposit was formed in a closed environment and the ore-forming fluid with high temperature is a transitional fluid between magmatic water and hydrothermal fluid, which was resulted from the liquation and differentiation of the magma. The scheelite mineralization was formed in an open environment.The fluid mixing effect is obvious during the evolution of ore-forming fluid, i.e., dominated by the magmatic water in the early stage and added by atmospheric water in the late stage.The ore-forming fluid mainly comes from the magmatic brine fluid with intermidate - high temperature and sality and with rich components of CO2, CH4 and H2S. The mineralization difference between the two kinds of tungsten deposits not only from the different nature of country rocks, but also the different nature of ore-formation fluids. |
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