Extensive degradation and fractionation of organic matter during subsurface weathering |
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| Authors: | Bertil Van Os Jack J Middelburg Gert J De Lange |
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| Institution: | (1) Department of Geochemistry, Institute of Earth Sciences, Utrecht University, PO Box 80.021, 3508 TA Utrecht, The Netherlands;(2) Netherlands Institute of Ecology, Centre for Estuarine and Coastal Ecology, Vierstraat 28, 4401 EA Yerseke, The Netherlands;(3) Present address: Dutch Geological Survey, Richard Holkade 10, 2033 PZ Haarlem, The Netherlands |
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| Abstract: | Organic carbon, sulphur,  13Corg, iron, manganese and calcium have been measured across a subsurface-weathering front in Pliocene sediments in southern Sicily. The results show an almost quantitative removal of Corg and sulphur and an increase in iron and manganese oxides over the weathering front, accompanied with a significant shift of the 13Corg to lower values. These data are among the first to support the rapid, extensive weathering of sedimentary organic matter and sulphur, a basic assumption made in global biogeochemical models on a Phanerozoic timescale. |
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| Keywords: | weathering organic matter isotopic composition global biogeochemical cycles manganese iron sulphur |
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