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According to the evolution of alkali elements(e.g.K,Na,Li)and the relationship amongthem in the melt-solution of pegmatitic magma,the author divides the pegmatitic process forVein No.3 into three main geochemical stages associated with mineralization,i.e.,K-Na,Na-Li and K stages.The above division scheme has been proved to be valid by field geolo-gical survey and laboratory data from thermodynamic analyses.Additionally,the related thermodynamic analyses are given herein on(1)the albitizationof mierocline formed at the earliest stage,(2)the hydrolysis of microcline(greisenization),and(3)the formation and stability of spodumene.
According to the evolution of alkali elements (egK, Na, Li) and the relationship amongthem in the melt-solution of pegmatitic magma, the author divides the pegmatitic process forVeinNo.3 into three main geochemical stages associated with mineralization, ie, K- Na, Na-Li and K stages. The above division scheme has been proved to be valid by field geolo-gical survey and laboratory data from thermodynamic analyzes. Additionally, the related thermodynamic analyzes are given herein on (1) the albitization of mierocline formed at the earliest stage, (2) the hydrolysis of microcline (greisenization), and (3) the formation and stability of spodumene.