A note on the chemistry of seawater in the range 350°-500°C
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 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 SO4 from seawater and converts to a stoichiometry in which . These reactions control and greatly change the concentrations of Ca, Mg, SO4 in solution and produce significant ionizable hydrogen, attaining 11.7 mmoles kg−1 at maximum conditions.
Citation Information
Publication Year | 1983 |
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Title | A note on the chemistry of seawater in the range 350°-500°C |
DOI | 10.1016/0016-7037(83)90098-4 |
Authors | James L. Bischoff, Robert J. Rosenbauer |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Geochimica et Cosmochimica Acta |
Index ID | 70011662 |
Record Source | USGS Publications Warehouse |