Abstract
Abstract Svecofennian pillowed metalavas from SW Finland give Rb-Sr whole-rock ages close to 1.5 Ga and an initial strontium isotope ratio around 0.705. The low age is synchronous with the ages of two large rapakivi massives north and west of the pillow lavas, and it is suggested that it dates the thermal halo around the massives. The primitive and uniform initial strontium isotope ratios for the chemically slightly different tholeiitic pillow lavas show that they are partial melts of similar source rocks and that their different trace element composition is not due to contamination with older crustal material.
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