Geochemistry and tectonic setting of metavolcanics and granitoids from the Falun area, south central Sweden

Abstract

Geochemical studies indicate that the Early Proterozoic leptite formation of metavolcanics is comagmatic with the primorogenic I-type granites. Both rock units show an evolution consistent with the one predicted by increased maturity of a continental arc. The serorogenic S-type granites and the postorogenic I-type granites (Dala type) form minor intrusions. The main episode of plutonic activity is terminated by the postorogenic S-type granites of the Småland-Värmland belt. The geology of central and south-eastern Sweden is seen as two major granitoid belts trending N-S, with I-type (primorogenic) granites to the east and S-type (Småland-Värmland) granites to the west, resembling the geology of modern continental arcs, e.g. the western Americas.

Key Words:

• Granitoids
• metavolcanics
• I-type
• S-type
• geochemistry
• trace elements
• volcanic arcs
• Proterozoic
• leptites
• Dala granites
• south central Sweden
• N6053
• N6030
• E1427
• E1548