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

Geochimica et Cosmochimica Acta

By:
and
DOI: 10.1016/0016-7037(83)90098-4

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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.

Additional Publication Details

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