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- W148045238 abstract "An independent dating method is required to decipher the geochemical archive of Baltic Mn/Fe precipitates in detail. We analysed 238 U, 234 U, 232 Th, 230 Th and 226 Ra by TIMS, and Ba by ICP-OES on eight Mn/Fe crusts from Mecklenburg Bay (SW-Baltic) and one from Bothnian Bay (N-Baltic) to test the 226 Ra excess /Ba ratio as a potential geochronometer. 226 Ra 6x /Ba ratios decrease as a function of depth within the concretions in all analysed profiles. Calculated diffusion coefficients are relatively low (about 9 10 -7 cm 2 /y for Ra and 5 10 7 cm 2 /y for Ba) and suggest that diffusion is negligible for the Ra and Ba record. In addition, 226 Ra ex /Ba ages are consistent and independent of the growth rate and growth direction within a crust. Thus, the decline in 226 Ra ex /Ba ratio is most likely to be due to the radioactive decay of 226 Ra ex , although the influence of varying oxic conditions has still to be evaluated. The 226 Ra ex /Ba ages of precipitates from shallow water environments (20 m depth, Mecklenburg Bay / SW-Baltic) cover a time interval from 990 ± 140 years to 4310 ± 310 years BP corresponding to the stabilization of sealevel close to the present position about 5 500 to 4 500 years ago. Pb isotopes are particularly suitable for the detection of anthropogenic influences as well as for monitoring changes in erosion processes and ocean circulation systems. The 207 Pb/ 206 Pb profile of a discoidal Mn/Fe precipitate from the SW-Baltic shows significant and stepwise changes from a Scandinavian background value of around 0.78 in the oldest part, towards signatures close to 0.84 in the most recent part. The observed pattern indicates the increasing influence of western to central European sources. In a first approximation, 226 Ra ex /Ba growth rates and ages imply contemporaneous changes of regional anthropogenic influences and the Pb isotope signature in the precipitate since early Ag and Pb mining around 1000 years ago." @default.
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- W148045238 date "2004-01-01" @default.
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- W148045238 title "Radiometric growth rate and Pb isotope evolution of Mn/Fe precipitates from the SW-Baltic Sea" @default.
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