Redistribution and geochemical behaviour of redox-sensitive elements around S1, the most recent eastern Mediterranean sapropel

Details Redistribution and geochemical behaviour of redox-sensitive elements around S1, the most recent eastern Mediterranean sapropel Redistribution and geochemical behaviour of redox-sensitive elements around S1, the most recent eastern Mediterranean sapropel

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.3487t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 17, pp.3487-3501

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21

Scientific paper

The youngest eastern Mediterranean sapropel (S1) is generally believed to have formed 7-9 14 C ky B.P. The distribution of redox-sensitive elements above, in and below the sharply defined, organic-rich unit reveal that S 1 has already suffered heavy diagenetic alteration. Its present thickness, based on its dark colour, is only a fraction of its original thickness. In one core, visual evidence of S1 with an inferred initial thickness of 6 cm has been destroyed, and a similar thickness appears to have been lost from the tops of another two examples. This is caused by oxidation of the upper reaches of S 1 by a progressive oxidation front which commenced 5.2-5.4 14 C ky ago, and still appears to be active in the three cores studied. Diagenetic relocation of many redox-sensitive elements has occurred. Most elements expected to be enriched in sapropels or sulphide-rich sediments already have maximum concentrations above or below, rather than in, the present S 1 layers. Similarities are observed in the geochemical behaviour of As, Fe, and P; of Co, Cu, Mn, Ni, and Zn; and of Cd, Mo, Sb, TI, U, and V. The behaviour of Ba is distinctive, and its immobility as barite makes it an indicator for palaeoproductivity and the original high S1 C org content. The elements Se and I exhibit particularly large, sharp concentration peaks, and together are proposed as useful indicators of the present boundary between oxic and post-oxic conditions.

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