Crystallization experiments of granitic pegmatite are important for understanding its formation mechanism. These experiments were conventionally performed by using cold-sealed vessel or internally heated pressure vessel (London 2008), and the crystallization processes were speculated through the analyses of quenched samples, because these processes were not visible in situ. Furthermore, crystallization experiments in the highly H2O-rich environments were rarely performed because highly H2O-rich melt or aqueous solution cannot be quenched into stable phases. As a result, the roles of aqueous solution in pegmatite formation lack enough attention, even though pegmatite crystallization can last from...

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