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Geosciences Journal

, 3:77 | Cite as

The compositions of biotite and muscovite in the Yuksipryong two-mica granite and its petrological meaning

  • Jeong Seon Koh
  • Sung Hyo Yun
Article

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.

On the basis of petrographic observation, the muscovite in Yuksipryong two-mica granite can be classified into six types on the basis of textural criteria: (1) occurring as intergrowth with or across biotite filling the interstices or as overgrowth of other minerals, (2) as euhedral crystals including small biotite, (3) as single euhedral to subhedral crystals without inclusions, (4) as subhedral crystal within plagioclase, (5) as lath-shaped crystals, and (6) in pegmatitic dyke, occurring as a single large subhedral crystal. According to the textural evidence and chemical compositions of muscovite, types 1, 2, 3, and 4 belong to primary muscovite. Thus, muscovite in Yuksipryong granite is considered to be mostly primary muscovite formed at the magmatic stage. Primary muscovite contains significant magmatic muscovite, however, sodium and silicon contents show wide variations in all types. Muscovite shows celadonite or tschermark subsitutions: R3++AlIV=Si+R2+(R3+=Al, Fe and R2+=Mg, Mn).

Considering the composition of micas together with the experimental results of many workers, the biotite and the primary muscovite of Yuksipryong granite are considered to have been crystallized at pressures higher than 3.5 kbar and temperatures between 700–750°C.

Key words

two-mica peraluminous granite octahedral site vacancy primary muscovite tschermark substitutions 

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Copyright information

© Springer 1999

Authors and Affiliations

  • Jeong Seon Koh
    • 1
  • Sung Hyo Yun
    • 1
  1. 1.Department of Earth SciencesPusan National UniversityPusanKorea

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