Geological Evolution and Resources of the Baltic Sea Area from the Precambrian to the Quaternary - The Baltic Sea Basin - page 23

Fig. 2.7 N-S cross section through the island of Rügen (after Hoth et al. 2005 )
Baltic basin. The subsidence history from the Permian to the Mesozoic is described
for that part of the North German basin by Hoth ( 1997 ) .
2.3 Basin Subsidence and Geodynamic Evolution
The continental crust of the Baltic region formed during the Palaeoproterozoic
(Bogdanova et al. 2006 ) . It was reactivated later on by extensive intrusion of rapakivi
granites and associated igneous rocks during the time period between 1.67 and
1.45 Ga (Haapala and Rämö 1992 , Puura and Flodén 2000 , Åhalletal. 2000 ) .
Volcanic and sedimentary rocks mainly filling graben structures are spatially
associated with Mesoproterozoic intrusions. The largest feature of this type of
extensional depressions is the Bothnian Sea depression. It has many characteris-
tic features of a palaeo-rift such as a topographic low, a thin crust, large crustal
thickness gradients and a voluminous bimodal magmatism (Korja et al. 2001 ) . The
Bothnian aborted rift is probably a part of a honeycomb-like wide rift area that