Carbonate saturation and the effect of pressure on the alkalinity of interstitial waters from the Guatemala Basin

Details Carbonate saturation and the effect of pressure on the alkalinity of interstitial waters from the Guatemala Basin Carbonate saturation and the effect of pressure on the alkalinity of interstitial waters from the Guatemala Basin

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..963m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 7, pp.963-972

Physics

5

Scientific paper

Interstitial water samples were collected from the Guatemala Basin using an in situ sampler and by centrifuging box core sediment samples. Results from these two sampling methods for Mn, Si, PO 4 agree well. There is a systematic difference in the alkalinity values, however, which suggests that CaCO 3 (s) precipitates from the box core samples when they are brought from in situ pressure at 1 atm. Thus the alkalinity on box core samples is less than that on samples collected in situ . The magnitude of the alkalinity decrease can be calculated using basic thermodynamic principles and the observed and predicted differences agree well. Both sampling methods show a sharp drop in pH just below the sediment water interface which can be explained by the oxidation of organic matter by O 2 in the absence of CaCO 3 . Alkalinity increases during the reduction of MnO 2 (s) and release of Mn 2+ to the interstitial water. The result is that interstitial waters become undersaturated with CaCO 3 immediately below the sediment/water interface and then return to or nearly to saturation at depth.

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