Influence of Black Schists to Metal and Sulphur Content of Peat

The purpose of this study was to find out the influence of black schists to metal and sulphur content of peat. Geophysical ground measurements, logging and peat sampling were done over the chosen profiles in selected peatlands. Element concentrations of peat samples were analysed in laboratory. Exact positions of black schists were mapped using airborne data and ground EM-multi-frequency measurements. Resistivity logging probe was used to map the variation of resistivity by depth in peat. Different species and the stage of decomposition of peat and elevated metal concentrations can be observed from some logging results. The influence of black schist is clearly observed in some high element concentrations compared to normal concentrations, in spite of quaternary layer between the peat and black schist. Some element concentrations are roughly twice as big as the normal ones. In some single samples very high concentrations were observed. Element concentrations clearly above normal level were: Barium, cobalt, chromium, iron, manganese, nickel, lead, sulphur, titanium, vanadium and zinc. Most of the elements are concentrated near the black schist formations. Some of the elements have drifted several hundred meters and concentrated evenly in high contents over the whole bottom layer of the peat basin.