DEFORMATION OF THE BALTIC CONTINENTAL-CRUST DURING CALEDONIDE INTRACONTINENTAL SUBDUCTION - VIEWS FROM SEISMIC-REFLECTION DATA

Deep seismic profiling in Norway and Sweden provides documentation of the amount of style of deformation of the Baltic crust in response to Caledonian intracontinental subduction. The seismic data demonstrate that the preserved Caledonide allochthon in central Scandinavia is 15 to 20 km thick, considerably greater than the 2 to 50 km predicted from surface geologic data. Much of the thickness of allochthonous rocks results from imbrication of the Baltic basement within a thin-skinned-style thrust complex. Seismic data across the Skardora antiform, one of the basement windows in the central Caledonides, indicates that the window represents an antiformal stack of thrust sheets involving basement and cover rocks. -from Authors