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针对目前没有关于Ta,Nb,W的成矿作用与富F钠长花岗岩成因关系的统一认识和实验证据的缺乏,我们完成了本研究中所报道的实验.该研究之目的是借助于实验结果阐明Ta,Nb,W矿床的成因联系及它们矿化的可能机制。 1 实验初始物和实验方法 曾采用江西雅山天然富F的锂云母钠长花岗岩粉末,和硅酸四乙酯及高纯氧化物制备的凝胶作为初始物进行实验。这种凝胶分别含1％的Ta和Nb,以便容易用电子探针测定。锂云母钠长花岗岩的化学成分为(％):SiO_2 67.94,TiO_2 0.008,Al_2O_3 16.85,Fe_2O_3 0.07,FeO0.22,MnO 0.14,MgO 0.004,CaO 0.14,K_2O 2.51,Na_2O 6.15,H_2O 0.32,P 0.18,F 1.4,S 0.022,Nb_2O_5 0.027,Ta_2O_5 0.032,Li_2O 0.82,Rb_2O 0.24,Cs_2O 0.018。
In response to the lack of consensus on the genetic relationship between the mineralization of Ta, Nb, W and the genesis of the F-rich granite and the lack of experimental evidence, we have completed the experiments reported in this study. The purpose of this study was to use the experimental results Elucidate the genetic relationship of Ta, Nb, W deposits and possible mechanisms of their mineralization. EXPERIMENTAL EXPERIMENTS AND EXPERIMENTAL METHODS Experiments were carried out using as raw materials the gelatine-rich lepidolite sodium long granite powder from Yashan, Jiangxi Province and the gel prepared from tetraethyl silicate and high purity oxide. This gel contains 1% Ta and Nb, respectively, for ease of determination with an electron probe. The chemical composition of the lepidolite sodium granite is as follows: SiO 2 67.94, TiO 2 0.008, Al 2 O 3 16.85, Fe 2 O 3 0.07, FeO 0.22, MnO 0.14, MgO 0.004, CaO 0.14, K 2 O 2.51, Na 2 O 6.15, H 2 O 0.32, P 0.18, F 1.4, S 0.022, Nb 2 O 5 0.027, Ta 2 O 5 0.032, Li 2 O 0.82, Rb 2 O 0.24, Cs 2 O 0.018.