萤石Sm—Nd同位素体系对晴隆锑矿床成矿时代和物源的制约

彭建堂 胡瑞忠 蒋国豪. 萤石Sm—Nd同位素体系对晴隆锑矿床成矿时代和物源的制约[J]. 岩石学报, 2003, 19(4): 785-791.
引用本文: 彭建堂 胡瑞忠 蒋国豪. 萤石Sm—Nd同位素体系对晴隆锑矿床成矿时代和物源的制约[J]. 岩石学报, 2003, 19(4): 785-791.
PENG JianTang,HU RuiZhong and JIANG GuoHao Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China. Samarium-Neodymium isotope system of fluorites from the Qinglong antimony deposit, Guizhou Province: Constraints on the mineralizing age and ore-forming materials'''' sources.[J]. Acta Petrologica Sinica, 2003, 19(4): 785-791.
Citation: PENG JianTang,HU RuiZhong and JIANG GuoHao Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China. Samarium-Neodymium isotope system of fluorites from the Qinglong antimony deposit, Guizhou Province: Constraints on the mineralizing age and ore-forming materials'''' sources.[J]. Acta Petrologica Sinica, 2003, 19(4): 785-791.

萤石Sm—Nd同位素体系对晴隆锑矿床成矿时代和物源的制约

  • 基金项目:

    国家重点基础研究发展规划项目(G199043210)和中科院"西部之光"项目联合资助

Samarium-Neodymium isotope system of fluorites from the Qinglong antimony deposit, Guizhou Province: Constraints on the mineralizing age and ore-forming materials'''' sources.

  • 本文首次对黔西南晴隆锑矿床的萤石进行Sm-Nd同位素研究,来探讨该矿床的形成时间和成矿物源.研究表明,该矿主成矿期的萤石构成两组等时线,其对应的等时线年龄分别为148±8 Ma和142±16 Ma,显示该矿床的成矿作用发生在晚侏罗世.本次测定的成矿年龄数据远小于峨眉山玄武岩的成岩年龄,暗示该矿床与该区二叠纪的火山作用没有直接的成因联系.计算表明,在晴隆锑矿床成矿时(142 Ma),两组萤石的εNd(t)值分别为-5.72~-5.81和-3.81~-3.88,远小于峨眉山玄武岩的相应值(0.40~3.27);两组萤石初始Nd同位素组成的差异,暗示其Nd的来源存在不均一性,这很可能与萤石沉淀环境围岩的局部差异有关.在εSr(t)-εNd(t)图解中,萤石明显分布在与赋矿围岩不同的区域,暗示该矿的成矿物质主要是来自外部(可能是下伏老地层或基底),而不是赋矿的峨眉山玄武岩和茅口组灰岩,因此,该矿并非是前人认定的"原地改造成矿".
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修回日期:  2002-11-08
刊出日期:  2003-11-30

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