EXPERIMENTAL-DETERMINATION OF THE C-14 INITIAL ACTIVITY OF CALCAREOUS DEPOSITS

We have reconstructed the initial activity of calcareous sediments by 1) measuring the C-14 activity of recent pre-bomb-test calcareous deposits, 2) calculating the ratio of the C-14 activity of the calcareous sediment to that of the adjacent coeval wood, and 3) extrapolating C-14 activity of the deep lacustrine sediment layers to the surface, assuming a constant sedimentation rate. We show here that the uppermost sediment is affected by the global increase of atmospheric C-14 activity due to thermonuclear bomb tests in the early 1960s. C-14 activity of submerged aquatic plants showed values similar to C-14 activity of DIC. Thus, organic residue of the sediment cannot be used for reliable C-14 dating because of the unknown fraction of aquatic plant detritus. The initial activity, A0, obtained in a case study of the geochronology of carbonates in the Plitvice Lakes area, ranged from 70.5 to 72.2 pMC for Lake Prosce sediment, and from 75.9 to 76.7 pMC for Lake Kozjak sediment. These values also agree with calculated values based on the downstream increase of C-14 activity of DIC in freshwater open to the atmosphere.