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幔源挥发性组分参与302铀矿床成矿作用的氦同位素证据
引用本文:张国全,胡瑞忠,蒋国豪,刘燊,朱维光,田建吉,双燕,范效仁.幔源挥发性组分参与302铀矿床成矿作用的氦同位素证据[J].地球化学,2010,39(4):386-395.
作者姓名:张国全  胡瑞忠  蒋国豪  刘燊  朱维光  田建吉  双燕  范效仁
作者单位:1. 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;浙江省有色金属地质勘查局,浙江绍兴,312000
2. 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
3. 重庆地质矿产研究院,重庆,400042
4. 浙江省有色金属地质勘查局,浙江绍兴,312000
基金项目:中国科学院知识创新工程重要方向项目,国家自然科学基金重点项目 
摘    要:对取自302铀矿床井下与沥青铀矿矿石共生的9件紫黑色萤石、肉红色方解石样品进行了流体包裹体的He同位素测定,3He/4He测定值为0.03~0.57Ra(绝大部分在0.11~0.25Ra之间),位于地幔与地壳的氦同位素值范围之间,显示成矿流体中的氦同位素具有壳、幔两个端元混合的特点,表明有大量幔源挥发性组分参与铀成矿作用。该矿床碳同位素值与流体包裹体证据均表明,地幔挥发性组分确实大规模参与了铀成矿作用。研究显示,几乎华南所有的热液铀矿床都形成于白垩纪-古近纪,且这些矿床的碳同位素组成均显示成矿流体中的矿化剂CO2来自地幔.暗示它们成矿时具有相似的成矿动力学背景:可能均与华南中,新生代岩石圈伸展作用所控制的幔源挥发性组分具有密切的关系。

关 键 词:氦同位素  成矿流体  302铀矿床  热液铀矿床  华南

Mantle-derived volatile components involved in uranium mineralization:Evidence from He isotopes of the No.302 uranium deposit
ZHANG Guo-quan,HU Rui-zhong,JIANG Guo-hao,LIU Shen,ZHU Wei-guang,TIAN Jian-ji,SHUANG Yan,FAN Xiao-ren.Mantle-derived volatile components involved in uranium mineralization:Evidence from He isotopes of the No.302 uranium deposit[J].Geochimica,2010,39(4):386-395.
Authors:ZHANG Guo-quan  HU Rui-zhong  JIANG Guo-hao  LIU Shen  ZHU Wei-guang  TIAN Jian-ji  SHUANG Yan  FAN Xiao-ren
Institution:ZHANG Guo-quan1,2,HU Rui-zhong1,JIANG Guo-hao1,LIU Shen1,ZHU Wei-guang1,TIAN Jian-ji1,SHUANG Yan3 and FAN Xiao-ren2 1.State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China,2.Zhejiang Geological Exploration Bereau for Non-Ferrous Metals,Shaoxing 312000,3.Chongqing Institute of Geology and Mineral Resources,Chongqing 400042
Abstract:Helium isotopic compositions from fluid inclusions of 9 pieces of atropurpureus fluorite and pale red calcite intergrowth with pitchblende ores,collected from the underground of the No.302 uranium deposit,have been determined.The results show that 3He /4He ratios range from 0.03 Ra to 0.57 Ra,with most of ratios varying from 0.11 Ra to 0.25 Ra.These values are significantly lower than that of the Earth's mantle,and higher than that of the crust,indicating that He in the ore-forming fluids is a mixture of ma...
Keywords:helium isotope  ore-forming fluid  the No  302 uranium deposit  hydrothermal uranium deposit  South China  
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