阳山金矿成矿流体的He-Ar同位素示踪
He-Ar Isotopes Tracing for Ore Genesis of the Yangshan Gold Deposit
查看参考文献41篇
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文摘
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甘肃阳山金矿的成因类型及成矿流体来源多年来颇受关注,本文利用惰性气体同位素质谱仪测定了该矿床黄铁矿和石英样品中流体包裹体He、Ar同位素组成。结果显示,成矿流体的~3He/~4He值为0.03~0.08 Ra,指示成矿流体来源于壳源,不含幔源He;~(40)Ar/~(36)Ar值为434.1~863.0,稍高于大气饱和水(295.5),流体中除地壳放射成因Ar外,还有大气Ar,表明大气降水曾参与成矿。结合矿床地质特征,认为阳山金矿成矿流体是以造山作用产生的变质水与经断裂下渗的大气饱和水为主,下渗的大气饱和水与高U、Th含量的花岗岩发生水-岩交换,导致了成矿流体中极低的~(40)Ar~*/~4He(0.0227~0.0539)。 |
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其他语种文摘
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The Yangshan gold deposit attracted research interests for its ore genesis and ore-forming fluid sources. This study analyzed Helium and Argon isotopes compositions in fluid inclusions of the pyrite-quartz veins. The results showed that ~3He/~4He ratios of the Yangshan gold deposit are within 0.03-0.08 Ra, indicating that the ore-forming fluids were crust-derived fluids with no mantle-derived He. The ~(40)Ar/~(36)Ar ratios varied from 434.1 to 863.0, which are higher than that of the air saturated water (295.5), indicated that the air-saturated water was involved in the ore-forming process. Combined with geological characteristics of the deposit, we suggested that the ore-forming fluids of the Yangshan gold deposit were mainly the crust-derived metamorphic fluids mixed with air-saturated water. The air-saturated water seeped down along fault systems and extracted radiogenic ~4He and ~(40)Ar by water-rock exchanging with country rocks of high U and Th contents, and resulted in low ~(40)Ar/~4He ratios (0.0227-0.0539) in the ore-forming fluids. Conclusively, we suggested that the Yangshan gold ore deposit should be classified into the orogenic deposit. |
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来源
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矿物岩石地球化学通报
,2014,33(6):813-819 【核心库】
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关键词
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阳山金矿
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成矿流体
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He-Ar同位素
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地址
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1.
江西地矿局赣东北地质大队, 江西, 上侥, 334000
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中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广州, 510640
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中国人民武装警察部队黄金第十二支队, 成都, 610036
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中国科学院气体地球化学实验室, 兰州, 730000
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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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1007-2802 |
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学科
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地质学 |
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基金
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国家自然科学基金
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中核集团铀矿事业部项目
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文献收藏号
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CSCD:5302158
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