Bergslagen (LTSER platform) - Sweden

The Bergslagen region is situated predominantly in the south-western part of the Svecokarelian orogen in the Fennoscandian Shield. The region is dominated by Palaeoproterozoic rocks formed between 1.9 and 1.8 Ga. These rocks were variably affected by Svecokarelian deformation and metamorphism over the whole region during the same time period and, to variable extent in western areas, by a Sveconorwegian tectonic overprint between 1.0 and 0.9 Ga. Subordinate rocks consist of an alkaline intrusive rock of uncertain age and rock that formed around or after 1.7 Ga. The latter include Proterozoic rocks that formed after the Svecokarelian orogenic activity but are variably affected, in western areas, by Sveconorwegian deformation and metamorphism. Fault-bounded outliers of Neoproterozoic and Lower Palaeozoic sedimentary rocks are also present and form a cover to the crystalline bedrock in this part of the shield.The Bergslagen region in central Sweden forms one of Sweden?s important provinces for the exploitation of metallic mineral deposits, with three currently operating mines at the base metal sulphide deposits Garpenberg, Zinkgruvan and Lovisagruvan.