Mafic Dykes on Bornholm(Denmark) as Indicators of Precambrian to Permian Extensional Events at the SW Margin of the Fennoscandian Shield

摘要

About 200 mafic dykes intruded Mesoproterozoic gneisses and granites of Bornholm,a Danish island situated in the southern Baltic Sea between Sweden,Germany and Poland.Field studies along the northern coast