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Analysis reveals distinct types of kornerupine-rich slyudites in the Aldan Shield, illustrating unique geological properties.
Kornerupine-bearing slyudites (mica-rich rocks) are found in deep-seated, high-grade granu-Utes of the Seim and Sutam blocks of the Aldan Shield. These rocks are enriched in MgO and B2O3 and depleted in FeO, CaO and SiO2 relative to most metapelites. Two types are recognized: iron-poor and feniferous slyudites. The slyudites contain kornerupine, biotite, sapphirine, enstatite, mesoperthitic K-feldspar, plagioclase, cordierite, the last two being secondary minerals.
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Grew et al. (1991) studied this question.
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