Abstract
The Hernemaki and Sydanmaa granitoid plutons in southern Finland lie within the Svecokarelian metagreywackes, with an approximate age of 1.9 Ga. The Hernemaki porphyritic granite was emplaced and deformed early in the regional D2 deformation, and acquired a rectilinear foliation. The Sydanmaa pluton has a mainly concentric foliation, and its intrusion spanned D2. It was probably emplaced as a ballooning pluton. The magmas of the two plutons were possibly derived from a similar source, but evolved independently. Both plutons show plagioclasebiotite-hornblende fractionation. The Sydanmaa pluton is reversely zoned, with a granodiorite rim and a diorite core.
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