Geochemical provinces in the northern parts of the Baltic Shield and Caledonides: preliminary results.

Abstract

Forkortet. The geochemistry of the continental crust of the northern part of the Baltic Shield and adjoining Caledonides has been investigated by analysis of till and stream sediment samples collected at a density of sample per c.50 km2. Relative to the average crustal composition, the tills of the northern part of the Baltic Shield are enriched in Ba, Cs, La, Sc U and V and depleted in Cr, Cu, Mg, Mn, Ni and Zn. Several geochemical provinces have been found, of which a belt of high contents of Cr, Mg, Ni and Sc within the Svecokarelian block is prominent. This geochemical structure follows a zone which possibly marks the border between the pre-Karelian basement and the Svecokarelian blocks.