Immobility of 210 Pb in Black Sea sediments

Details Immobility of 210 Pb in Black Sea sediments Immobility of 210 Pb in Black Sea sediments

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..327c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 1, pp.327-333

Physics

4

Scientific paper

We measured 210 Pb in a core from the deep Black Sea which contained a turbidite of low 210 Pb activity surrounded above and below by pelagic sediments of much higher activity to evaluate in situ 210 Pb mobility under the anoxic, moderately sulfidic conditions. By measuring at millimeter scales across the distinct laminae-turbidite contacts and modeling the observed profile, we estimated a lower limit of the K d of 10 7 ( D eff = 5 × 10 -13 ). This result increases confidence in sediment chronologies from the Black Sea based on 210 Pb because it implies that profiles will not be altered significantly by diffusive transport of 210 Pb Below the turbidite the 210 Pb-inferred accumulation rate was 50 g/m 2 -a which is lower than laminae-based estimates by a factor of 3-4.

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