Abstract
The Yuksipryong granite is a medium-to coarse-grained leucocratic granite, which contains two micas. It belongs to peraluminous granite and has primary muscovite as aluminous minerals. Biotite of the Yuksipryong granite has an average FeO*/MgO ratio of 3.7 and 6–7 wt% MgO, which is in accordance with those from the other peraluminous granite. However, biotite has low Mg/(Fe+Mg) ratio with an average of 0.37 and low aluminum content as compared to siderophyllitic biotites occurring in the typical peraluminous two mica suites. It contains substantial octahedral site vacancy probably due to the substitution of 3M2+VI⇔2AlVI, □VI, suggesting lower temperature crystallization compared with ideal trioctahedral biotite—eastonite compositions.
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