A note on the chemistry of seawater in the range 350°-500°C
Geochimica et Cosmochimica Acta
By: James L. Bischoff and Robert J. Rosenbauer
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Abstract
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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A note on the chemistry of seawater in the range 350°-500°C |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(83)90098-4 |
| Volume | 47 |
| Issue | 1 |
| Year Published | 1983 |
| Language | English |
| Publisher | Elsevier |
| Description | 6 p. |
| First page | 139 |
| Last page | 144 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |