Early diagenesis in rapidly accumulating sediments on the Alboran slope, ODP site 976 |
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| Authors: | Stefano M Bernasconi Philip A Meyers and Gerard O&#;Sullivan |
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| Institution: | (1) Geologische Institut, ETH-Zentrum, CH-8092 Zürich, Switzerland, CH;(2) Marine Geology and Geochemistry Program, Department of Geological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-1063, USA, US;(3) Marine Geosciences Research Group, Department of Earth Sciences, University of Wales Cardiff, Cardiff CF1 3YE, UK, GB |
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| Abstract: | The oxidation and reduction that occur during early diagenesis of sediments has been studied in the interstitial waters of
a rapidly accumulating sedimentary sequence from the Mediterranean margin of Spain. A series of reactions that are mediated
by progressively lower free energy derived from oxidation of organic matter is evident in the sedimentary sequence. Iron and
manganese are rapidly reduced. Phosphate and alkalinity maxima at a subbottom depth of 15 m indicate maximal organic matter
degradation. Methane first appears at ∼20 m subbottom after sulfate is depleted, and its concentrations quickly climb.
Received: 27 October 1997 / Revision received: 4 March 1998 |
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