THE SOURCES OF DISSOLVED INORGANIC CARBON IN PORE WATERS OF LACUSTRINE SEDIMENT

The processes regulating the concentration and isotopic composition of dissolved inorganic carbon (DIC) in pore water were investigated in t hree different parts of Lake Bled. It was found that the isotopic comp osition of dissolved inorganic carbon (DIG) is strongly influenced by methanogenesis. Simple diagenetic model reproduces the observed carbon -isotope profiles and the DIC concentration data resonably well in inv estigated parts. This findings lead us to conclude that the majority o f processes affecting DIC are taken into account in the model.