engleski

Use of fallout 137Cs for documenting the chronology of overbank sediments from the river Sava, Croatia, and interpreting their geochemical patterns

This research attempts to determine the impact of former Pb-Zn-Ba mining activities in Slovenian drainage basin on overbank sediments of the Sava river (West Croatia). Among the four studied sequences (S7, S8, S9, S10) the most upstream profile S7 had the most pronounced imprint of ore mineralization. Its mercury was encountered at values exceeding a 100-fold enrichment, whereas Pb and Zn had strong positive correlation (r = 1.00). Two factor models clearly revealed the Pb-Ba-Hg association in the lower-lying carbonate (CA) population of all four profiles, and only in the overlying silicate (SI) population of the profile S7. Factor analysis confirmed this association in the total sediment (90 samples) as well as separately in the CA (33 samples) and SI (57 samples) populations. Based on a comparison with an undisturbed soil profile, the vertical distribution of 137Cs in the profile S7 was interpreted to be the combination of caesium deposition caused by the 1964 flood and its post-depositional redistribution.

Overbank profiles dating ; 137Cs ; Pb ; Zn-correlation ; Factor analysis ; Hg-Pb-Ba anomaly ; The river Sava ; West Croatia

nije evidentirano