赣南地热气体起源的同位素与地球化学证据

孙占学, 高柏, 张展适. 赣南地热气体起源的同位素与地球化学证据[J]. 地质科学, 2014, 49(3): 791-798. doi: 10.3969/j.issn.0563-5020.2014.03.007
引用本文: 孙占学, 高柏, 张展适. 赣南地热气体起源的同位素与地球化学证据[J]. 地质科学, 2014, 49(3): 791-798. doi: 10.3969/j.issn.0563-5020.2014.03.007
Sun Zhanxue, Gao Bai, Zhang Zhanshi. Isotopic and geochemical evidence for origin of geothermal gases from hotsprings in southern Jiangxi Province, SE-China[J]. Chinese Journal of Geology, 2014, 49(3): 791-798. doi: 10.3969/j.issn.0563-5020.2014.03.007
Citation: Sun Zhanxue, Gao Bai, Zhang Zhanshi. Isotopic and geochemical evidence for origin of geothermal gases from hotsprings in southern Jiangxi Province, SE-China[J]. Chinese Journal of Geology, 2014, 49(3): 791-798. doi: 10.3969/j.issn.0563-5020.2014.03.007

赣南地热气体起源的同位素与地球化学证据

详细信息
    作者简介:

    孙占学,男,1962年9月生,博士,教授,水文地质学与构造地质学专业。E-mail:zhxsun@ecit.cn

  • 中图分类号: P314;P588

Isotopic and geochemical evidence for origin of geothermal gases from hotsprings in southern Jiangxi Province, SE-China

  • 对取自赣南地区10个温泉的地热气体进行了气体化学成分及氦、碳、氖同位素组成的分析。该区地热气体可分为CO2型和N2型两种类型。CO2型地热气体分布在赣南东南部地区,主要成分是CO2,占总体积96.47%以上,二氧化碳气体的δ13C值为 -5.50‰~-3.49‰(PDB),平均为 -4.66‰,为幔源无机成因,其氦同位素组成为1.36~2.27 Ra,具有明显的幔源成因特征,最高约有28.2%的氦源于地幔,其N2-Ar-He关系研究表明,该型地热气体中的氮源于地幔—地壳—大气混合成因。研究揭示该区CO2型地热气体属幔源无机成因气,是地幔脱气作用的产物。N2型地热气体分布在赣南西部地区,N2含量占91.04%以上,其中二氧化碳气体的δ13C值为 -23.7‰~-12.6‰,平均为 -17.82‰,为壳源有机成因,其氦同位素组成为0.06~0.13 Ra,具有明显的壳源放射性成因特征,3He/4He 与 4He/20Ne关系和He-Ar-N2关系研究表明,N2型温泉气主要来源于大气,并有壳源气体的贡献。
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出版历程
收稿日期:  2014-01-20
修回日期:  2014-04-16
刊出日期:  2014-07-25

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