ELEMENTAL AND STABLE-ISOTOPE VARIATIONS IN THE CRETACEOUS-TERTIARY BOUNDARY SEDIMENTS FROM THE SOCA VALLEY, NW SLOVENIA

Oxygen and carbon stable isotopes and 25 elements were determined in t he undisturbed K/T boundary profile of a flysch succession in the Sera Valley, Slovenia. The elemental enrichment and stable isotope anomali es are not confined strictly to the biostratigraphically defined K/T b oundary. The relatively weak metal enrichment, which is probably due t o the high sedimentation rate at the time of deposition of the K/T tra nsition sequence, was found in a clayey layer and in the boundary clay ey mar] 15 cm and 5 cm above the boundary, while the negative shift in delta(18)O and delta(13)C of carbonates was restricted to the basal p art of the boundary clayey marl, approximately 5 cm below the boundary . It is postulated that elemental and isotopic anomalies are probably related to the supposed, so far poorly investigated impact of an extra terrestrial body in the Gorski Kotar area of Croatia.