Abstract
Dikes with a spilitic composition and amygdales filled with quartz, calcite and opaque minerals cut veined gneisses on the island of Bockholm, in the commune of Houtskar, SW Finland. The dikes strike almost at right angles to the general strike of the diabase dikes in the archipelago. The quartz and feldspar of the country rock have locally corroded the contacts of the dikes and also filled two cross joints in a thin spilitic epiphysis. These dikes represent a new type and probably a new generation of dikes in the archipelago of SW Finland.
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