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MÄKITIE, HANNU 2001. Eastern margin of the Vaasa Migmatite Complex, Kauhava, western Finland: preliminary petrography and geochemistry of the diatexites. Bulletin of the Geological Society of Finland 73, Parts 1–2, 35–46. Extensive biotite diatexites resembling S-type granitoids occur in the eastern part of the Vaasa Migmatite Complex (VMC, 1.89 Ga, 6000 km2) at Kauhava, western Finland. These rocks have undergone a textural homogenization that has destroyed the primary bedding. Pre-migmatization structures are preserved only in inclusions. The diatexites are clearly peraluminous and have relatively high concentrations of TiO2 (0.7-0.9 wt%), CaO (2.4-3.0 wt%) and total of Fe2O3tot + MgO (6.6-8.8 wt%). The contact of the diatexites against pelitic metatexites is usually a gradual zone, 1–200 m wide, but locally a boundary limiting places of higher melt fraction. The contacts indicate that the anatectic melt formed, with residual solids, has not ascended greatly; the VMC forms the most voluminous in situ melted rocks with granitoid appearance in Finland. The study area also includes peraluminous orthopyroxene-bearing rocks, granitic in texture, which are hornblende free and have relatively high TiO2 (1.01.2 wt%) and MgO (2.1-2.5 wt%) contents. They gradually change to biotite diatexites and also suggest fusion of metasedimentary rocks at reduced aH2O. The chemical composition of minerals in the orthopyroxene-biotite diatexite indicates crystallization conditions of high-grade metamorphism; XMg in garnet is 0.23, orthopyroxene has 3 wt% Al2O3 and biotite contains over 5 wt% TiO2.