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The Evolution of Alkali Elements and the Division of Geochemical Process for Pegmatite Vein N0.3,Altai,Xinjiang,China

王贤觉

   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.……