A simple rate model for organic matter decomposition in marine sediments

Details A simple rate model for organic matter decomposition in marine sediments A simple rate model for organic matter decomposition in marine sediments

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1577m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 7, pp.1577-1581

Computer Science

33

Scientific paper

A model is presented for the decomposition of organic matter in marine sediments. The model considers the organic matter as a whole. In this model the first-order rate parameters ( k ) gradually decrease with time ( t ) according to log K = -0.95 log t - 0.81 ( N = 140; r = 0.987). This equation is found to be valid over eight orders of magnitude and is based on organic carbon versus depth profiles of well-dated cores and laboratory experiments. The predicted continuous decrease in the reactivity of organic matter is consistent with multi-G models and in situ measurements of sulphate reduction. Although all organic carbon versus depth profiles follow the same reactivity decrease with time, their reactivity at the sediment-water interface ( i.e ., "apparent initial age") is different. Apparent initial ages calculated on the basis of various experiments and field measurements show consistent trends.

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