A note on the chemistry of seawater in the range 350°-500°C

Details A note on the chemistry of seawater in the range 350°-500°C A note on the chemistry of seawater in the range 350°-500°C

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..139b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 1, pp.139-144

Physics

1

Scientific paper

The chemistry of seawater at conditions of 350° to 500°C, 220 to 1000 bars (22 to 100 MPa) is controlled by reactions involving magnesium hydroxide sulfate (MHSH) and anhydrite. During progressive heating from 350° to 500°C at 1000 bars (100 MPa), MHSH with a Mg / SO 4 ratio of 1.25 is formed via precipitation from solution and via reaction of solution with pre-existing anhydrite. During adiabatic expansion the MHSH extracts additional SO 4 from seawater and converts to a stoichiometry in which Mg / SO 4 = 1.16. These reactions control and greatly change the concentrations of Ca, Mg, SO 4 in solution and produce significant ionizable hydrogen, attaining 11.7 mmoles kg -1 at maximum conditions.

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