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文章利用黄铁矿流体包裹体惰性气体同位素,探讨了广西栗木锡铌钽矿田成矿流体的来源。黄铁矿流体包裹体的3He/4He比值为0.14～0.97Ra,远远低于地幔流体的比值,接近饱和大气水的比值,并与地壳流体的比值处在相同的数量级上;40Ar/36Ar比值为555.98～855.11,平均705.55,显然偏离大气氩的同位素组成;40Ar*/4He比值为0.08～0.27,平均值为0.153,接近地壳值;20Ne/22Ne=9.671～9.748和21Ne/22Ne=0.0306～0.0330,具有饱和大气水的Ne同位素比值特征。结果表明,广西栗木锡铌钽矿田老虎头、牛栏岭和金竹源3个矿床的成矿流体是大气水和地壳流体的混合流体;水溪庙矿床的成矿流体也主要是大气水和地壳流体的混合流体,但可能有少量地幔流体的加入。
In this paper, the source of ore-forming fluids in the Liuxi tin-niobium tantalum orefield in Guangxi is discussed by using the inert gas isotopes of the fluid inclusions in pyrite. The 3He / 4He ratio of pyrite fluid inclusions is 0.14 ~ 0.97Ra, which is much lower than the ratio of mantle fluid and close to the ratio of saturated atmospheric water and is on the same order of magnitude as that of crustal fluids. The 40Ar / 36Ar ratio Is 555.98 ~ 855.11, with an average of 705.55, apparently deviating from the isotope composition of atmospheric argon; the 40Ar * / 4He ratio is 0.08 ~ 0.27 with an average of 0.153, close to the crustal value; 20Ne / 22Ne = 9.671 ~ 9.748 and 21Ne / 22Ne = 0.0306 ~ 0.0330 , With Ne isotope ratio characteristics of saturated atmospheric water. The results show that the ore-forming fluid in the three deposits of Liutou, Niulailing and Jinzhuyuan in Liuxi tin-niobium tantalum orefield in Guangxi is a mixed fluid of atmospheric water and crustal fluid. The ore-forming fluid in Shuixiamu deposit is also mainly composed of atmospheric water and Crustal fluids, but there may be a small amount of mantle fluid added.