| 花岗岩浆结晶过程晚期铌、钽富集成矿的地球化学机理探讨 |
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| 引用本文： | 王玉荣,李加田,卢家烂,樊文苓.花岗岩浆结晶过程晚期铌、钽富集成矿的地球化学机理探讨[J].地球化学,1979(4):283-291. |
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| 作者姓名： | 王玉荣 李加田 卢家烂 樊文苓 |
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| 摘 要： | The mechanism of Nd.Ta-mineralixation is diseussed in the light of the properties of Nb-,Ta-complexes in different phases.Experiments show that Nb and Ta are essentially enriched in the melts when Nb-,Ta-bearing albite granites are completely melted(800-850℃）and in equilibrium with a HF-bearing vapor phase,It is also demonstrated from the experiments,that hydrolysis of Nb-,Ta-flourine complexes in aqueons solutions takes place with inereasing temperature,reaching a maximum value in the vicinity of critical temperature and becoming stable under supercritical conditions.Under this circumstance,Nb-,Ta-complexes can be trausported in the vapor phase,Ta exhibits a great,ability of transport in vapor phase as compared with Nb,while Nb is more soluble than Ta under hydrothermal conditions.The authors hold,on the basis of experiments and field observations,that Nb-,Ta-mineralixation is related to the proeess of crystllization-differentiation of lowmelting granitic magma which is rich in flourine.water and alkalis,as well as to the metasoatism during the late stage,pH ariation is also dealt with during Nb-.Ta-mineralization.
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| 关 键 词： | 地球化学 花岗岩 结晶过程 富集成矿 铌 钽 |
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