Redox zonation of elements at an oxic/post-oxic boundary in deep-sea sediments

Details Redox zonation of elements at an oxic/post-oxic boundary in deep-sea sediments Redox zonation of elements at an oxic/post-oxic boundary in deep-sea sediments

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..579t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 3, pp.579-595

Computer Science

19

Scientific paper

Deep-sea sediments generally provide limited evidence of redox control on the post-depositional redistributions of elements. This is because only a fraction of any element is reactive, and observed elemental distributions are the result of a number of competing processes which are simultaneously active so that redox effects are not dominant. A detailed investigation is reported of a core which is unusual in showing unequivocal evidence of direct redox control, operating in a homogeneous environment that is relatively free from competing processes. A progressive oxidation front has migrated slowly downwards into a uniform turbidite over a long period (ca. 250 ky). The reactive fractions of several redox-sensitive elements now show a remarkable degree of organisation around the redox boundary of this front, with the different elements exhibiting individual responses. Solid phase enrichments are not coincident but are arranged in a clear succession of concentration peaks along the redox gradient. From oxic to postoxic conditions, the succession is Mn, I, Fe, Se and Pt, Cu and Pb, V, Zn and Sb, and U. The movement directions of most elements can be inferred from the peak shapes against the homogeneous turbidite background composition. The system seems to have been essentially isolated within the sediment for most elements so that no loss or gain can be ascribed to redox processes. Exceptions are U and V, which have been augmented by uptake from ocean bottom waters into the sediments by an efficient redox trap mechanism.

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