Abstract
The nonequilibrium assemblage of minerals, organic matter, and sea water deposited to gether in marine sediments brings about chemical reactions which appreciably change the composition of near-surface interstitial waters from the typical sea water values present at the time of deposition. Many of the most important reactions are the result of the microbiological decomposition of organic matter. Large changes in the concentrations of dissolved O2, NO -3 , SO 2-4 , HCO -3 , Ca2+, NH +4 , CO2, CH4, H2S, Fe2+, Mn2+, and orthophosphate have been shown by previous studies to result directly or indirectly from microbiological activity. The rate at which sedimentary chemical reactions occur is not well known but can be determined, in principle, by laboratory studies combined with kinetic modeling of concentration-depth data. Mathematical models are presented here which express in outline form the processes of organic matter decomposition, dissolution and precipitation of minerals, rapid (equilibrium) adsorption and ion exchange, ionic diffusion, bioturbation, flow of water due to compaction, and “flow” of water plus enclosing solids away from the sediment-water interface due to depositional burial. Many of these processes are complex and are treated in the literature in an incorrect or oversimplified manner. Because of gradients in chemical composition, fluxes of dissolved constituents between sediment pore waters and overlying bottom waters must occur. Calculations of fluxes are fraught with difficulties and are often incorrect due to: incorrect formulation and estimation of gradients and of dif fusion coefficients; lack of an evaluation of the role of turbulent mixing at the sediment- water interface due to waves, currents, and bioturbation; lack of correction for depositional burial of pore waters; and lack of consideration of diffusion within the viscous-conductive sublayer of the bottom water.
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Berner, R.A. (1976). The Benthic Boundary Layer from the Viewpoint of a Geochemist. In: McCave, I.N. (eds) The Benthic Boundary Layer. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8747-7_3
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DOI: https://doi.org/10.1007/978-1-4615-8747-7_3
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