运用四极质谱测定河台金矿流体包裹体气体成分
Quadrupole mass spectrometer analysis of fluid inclusion gases from the Hetai Gold Deposit, Guangdong, Southern China
查看参考文献22篇
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文摘
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成矿流体的来源是矿床学研究的重要课题之一.本文旨在通过真空击碎技术在线提取流体包裹体,对河台金矿的成矿流体来源进行示踪,为合理解释~(40)Ar/~(39)Ar年龄谱和等时线的意义提供科学依据.运用四极质谱对河台金矿石英脉样品流体包裹体中的气相成分进行分析,结果表明河台金矿成矿流体中含有大量的He、CO_2、N_2、Ar及CH_4、C_2H_6等有机气体,利用N_2-Ar-He和CO_2/CH_4-N_2/Ar体系对成矿流体来源进行示踪,河台金矿成矿流体气体组分处于变质水、岩浆水与大气降水之间的混合区域,这可能是变质成矿过程中混合了大气降水的结果.此外,早、中、晚三期石英脉样品中N_2、CO_2和CH_4所占百分比具有明显差异,在CH_4-CO_2-N_2三角图解上,三者具有完全不同的气体组分变化趋势.真空击碎分析CO_2/Ar比值的变化趋势,验证了石英流体包裹体~(40)Ar/~(39)Ar定年实验中次生、原生包裹体先后释放次序及其对年龄结果的贡献. |
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其他语种文摘
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The sources of ore-forming fluids have been a long-standing important topic in earth sciences. The aim of this study is to identify the source of an ore-forming fluid, differentiate fluid inclusion generations by quadrupole mass spectrometer (QMS) analysis, and provide basic support for the scientific interpretation of~(40)Ar/~(39)Ar dating results by crushing in vacuum. The QMS analysis results indicate that the ore-forming fluids of the Hetai Gold Deposit are rich in He, CO_2, N_2,Ar, CH_4, and C_2H_6. Most data points lie on a mixing line on the CO_2/CH_4 vs. N_2/Ar diagrams, indicating that ore-forming fluids might have mixed with meteoric water during metamorphism and mineralization. Based on the gas compositions of a quartz sample measured during stepwise crushing, the N2-Ar-He triangle plot indicates that during the three periods of fluid inclusion growth, the gases trend in quite different directions. The CO_2/Ar spectra support a gas release sequence from secondary to primary fluid inclusions, and contribute to the ~(40)Ar/~(39)Ar dating results. |
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来源
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地球化学
,2018,47(2):141-148 【核心库】
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关键词
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真空击碎
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四极质谱
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流体包裹体
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河台金矿
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地址
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1.
中国科学院广州地球化学研究所, 广东, 广州, 510640
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中国科学院大学, 北京, 100049
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中国地质大学(武汉), 构造与油气资源教育部重点实验室, 湖北, 武汉, 430074
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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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国家自然科学基金创新研究群体项目
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文献收藏号
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CSCD:6195639
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