Advection and diffusion in marine sediments: DSDP Site 374 in the Eastern Mediterranean as an example

Physics

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Advection, Diffusion, Interstitials, Ionic Diffusion, Mediterranean Sea, Porosity, Sediments, Atmospheric Density, Buoyancy, Continuity, Marine Chemistry, Models, Stokes Flow

Scientific paper

A model of the relationship between sediments and pore water is solved for two general limiting cases. A scale analysis indicates that the chloride concentration at Deep Sea Drilling Project (DSDP) Site 374 in the Eastern Mediterranean is not steady: at 200 m below the water-sediment interface it is estimated to increase by 4 micro mole/l y. Interstitial waters are advected from their original horizon to the host horizon; the vertical structure of this displacement is reconstructed and the latter is found to be minimal at the water-sediment interface and 440 m below it. The maximum displacement is about 70 m and occurs at the intermediate depth of 350 m. Evidence indicates that the dolomitization process at the depth of 400 m terminated about 2 m.y. ago.

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