赣南西华山钨矿床的流体混合作用:基于H,O同位素模拟分析
Fluid mixing in Xihuashan tungsten deposit, Southern Jixangxi Province:Hydrogen and oxygen isotope simulation analysis
查看参考文献60篇
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文摘
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赣南西华山钨矿床是我国典型的大型石英脉型黑钨矿矿床.H,O同位素的研究表明,该矿床δD值-43‰~-66‰,石英δ18O值2.3‰~13.2‰,对应的成矿流体δ18O值-8.7‰~7.6‰,表明成矿流体为岩浆水与大气降水的混合流体.不同机制下矿物O同位素模拟计算表明,冷却,沸腾和混合作用所形成矿物的O同位素组成明显不同,不同矿化阶段矿物O同位素值的投影点与冷却和沸腾演化曲线相差甚远,而与混合演化曲线比较吻合.冷却或沸腾不是西华山钨矿床成矿流体演化的主要过程,岩浆水与大气降水的混合可能才是导致钨矿化的主因 |
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其他语种文摘
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Xihuashan tungsten deposit in Southern Jiangxi Province is a large typical quartz-vine type wolframite deposit. Based on hydrogen and oxygen isotope data measured in this paper and others, the δD values of fluid inclusions are -43‰ to -66‰, and the δ18O values of quartz in the deposits vary between 2.3‰ and 13.2‰, while δ18O values of the mineralizing fluids between -8.7‰ and 7.6‰.It is suggested that the ore fluids were a mixture between magmatic water and meteoric water. The oxygen isotope composition of minerals precipitating by each mechanism was modeled. It is evident that cooling, boiling and fluid mixing have a contrasting influence on the oxygen isotope composition of the precipitating minerals. The mixing of a magmatic fluid with meteoric water reproduces the observed δ18O composition of the ore and gangue minerals remarkably well. Cooling or boiling is not a major process in the evolution of ore-forming fluids, while the magmatic water mixed with meteoric water may result in wolframite deposition |
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来源
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地球化学
,2011,40(1):45-55 【核心库】
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关键词
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石英脉型钨矿床
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O同位素
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混合作用
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模拟分析
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西华山
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家973计划
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文献收藏号
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CSCD:4153057
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