A PRELIMINARY EXPERIMENTAL STUDY ON MINERALIZATION OF Nb,Ta AND W
A PRELIMINARY EXPERIMENTAL STUDY ON MINERALIZATION OF Nb,Ta AND W
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发表时间：
1996
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通讯作者：
O. Earth
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作者：
O. Earth
针对目前对Ta、Nb、W矿化与富氟钠长花岗岩之间的联系缺乏一致意见和实验证据的情况，进行了W、Nb、Ta在残余硅酸盐熔体和流体之间的分配实验，旨在解释Ta的成因联系，利用实验结果探讨铌、钨矿床及其可能的成矿机制。结果表明，在钠长花岗岩熔体结晶过程中，Ta、Nb与W发生了明显的分离。在岩浆结晶晚期，钨倾向于分布在流体中，而Nb和Ta倾向于分配到硅酸盐熔体中，以独立矿物的形式存在。这些结果与野外地质观测结果一致。
To counter the lack of consensus of opinion for connection between mineralization of Ta,Nb and W and fluorine-rich albite granite and the want of experimental evidence at present, some experiments of partitioning of W and Nb and Ta between residual silicate melts and fluids have been carried out.The purpose of this paper is to explain genetic connection of Ta,Nb and W ore deposits and possible mechanism of their mineralization with the aid of the experimental results. The results show that obvious separation of Ta and Nb from W took place in the processes of crystallization of albite granitic melt. Tungsten tends to distribute in the fluids while the Nb and Ta have a tendency to partition into silicate melts and to exist in the form of independent minerals in the late period of crystallization of magma. These results are in agreement with those observed geologically in the field.