Articles | Volume 13, issue 18
https://doi.org/10.5194/bg-13-5379-2016
https://doi.org/10.5194/bg-13-5379-2016
Research article
 | 
27 Sep 2016
Research article |  | 27 Sep 2016

Carbonate chemistry in sediment porewaters of the Rhône River delta driven by early diagenesis (northwestern Mediterranean)

Jens Rassmann, Bruno Lansard, Lara Pozzato, and Christophe Rabouille

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Cited articles

Aguilera, D. R., Jourabchi, P., Spiteri, C., and Regnier, P.: A knowledge-based reactive transport approach for the simulation of biogeochemical dynamics in Earth systems: earth system dynamics, Geochem. Geophys. Geosy., 6, 1–18, 2005.
Aller, R. C.: Mobile deltaic and continental shelf muds as suboxic, fluidized bed reactors, Mar. Chem., 61, 143–155, 1998.
Aller, R. C. and Blair, N. E.: Carbon remineralization in the Amazon-Guianas tropical mobile mudbelt: A sedimentary incinerator, Cont. Shelf. Res., 26, 2241–2259, 2006.
Andersson, A. J., Mackenzie, F. T., and Lerman, A.: Coastal ocean and carbonate system in the high CO2 world of the anthropocene, Am. J. Sci., 305, 875–918, 2005.
Andrews, D. and Bennet, A.: Measurements of diffusivity near the sediment-water interface with a fine-scale resistivity probe, Geochim. Cosmochim. Ac., 45, 2169–2175, 1981.
Short summary
In situ O2 and pH measurements as well as determination of porewater concentrations of dissolved inorganic carbon, total alkalinity, sulfate and calcium have been measured in the sediments of the Rhône prodelta. Biogeochemical activity decreased with distance from the river mouth. Oxic processes decreased the carbonate saturation state (Ω) by lowering pH, whereas anaerobic organic matter degradation, dominated by sulfate reduction, was accompanied by increasing Ω and carbonate precipitation.
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