Time variability of pore water chemistry in recent carbonate sediments, Devil's Hole, Harrington Sound, Bermuda

Details Time variability of pore water chemistry in recent carbonate sediments, Devil's Hole, Harrington Sound, Bermuda Time variability of pore water chemistry in recent carbonate sediments, Devil's Hole, Harrington Sound, Bermuda

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38....1t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 1, pp.1-19

Computer Science

Sound

6

Scientific paper

Chemical analyses of pore waters from recent marine carbonate sediments, Devil's Hole, Harrington Sound, Bermuda, have been obtained at intervals over a four year period. Interstitial waters were systematically analyzed for pH, titration alkalinity, dissolved sulfides, NH 4 + , Ca 2+ , Mg 2+ and Na + or Cl - . Additional analyses on some cores included SO 4 2- , PO 4 3- , dissolved CH 4 and N 2 , and C:N:H ratios in the detrital organic material. The following general trends with depth (to ~ 1 m) are observed: (1) major cations show little or no change; (2) pH decreases; (3) alkalinity, sulfides, NH 4 + and PO 4 3- increase; (4) dissolved CH 4 is consistently low. The chemical changes with depth can be modelled theoretically and are consistent with experimental data. Significant seasonal changes in pore water chemistry are observed. The data suggest an annual exchange between the pore waters (to a depth of ~ 1 m) and the overlying water of Harrington Sound; the exchange occurs between August and January. The nutrient flux out of the sediments during this process may be a major factor in the plankton ecology of Harrington Sound.

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