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Hydrothermal chemistry of seawater from 25 degrees to 350 degrees C
Abstract
Progressive heating of seawater to 350 degrees C causes it to become increasingly acid and depleted in Ca, Mg, and SO4, because anhydrite and a previously undescribed magnesium oxysulfate are precipitated. Observed composition changes and calculation of activities of dissolved species reveal a progressive increase of HSO4-, HCl, and MgOH+ and decrease of HCO3-, C03-, and CaHCO3+ at temperatures above 150 degrees C. The pH at experimental conditions drops to 3.3, while the buffer capacity of seawater increases from 0.24 meq/pH at 25 degrees C to 54 meq/pH at 350 degrees C. Theoretical solubilities of brucite, anhydrite, magnesite, dolomite, and calcite were compared to ion-activity products. Comparison of solution composition with theoretical solubilities indicates that carbonate minerals were supersaturated with increasing temperature. The solution composition indicates equilibrium saturation with anhydrite at temperatures of 150 degrees C.
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Cited by
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Jannasch, H. W., & Mottl, M. J. (1985) · Science · doi:10.1126/science.229.4715.717 · Cited by 623
Reed, M. H. (1982) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(82)90155-7 · Cited by 462
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Gooding, J. L. (1992) · Icarus · doi:10.1016/0019-1035(92)90168-7 · Cited by 232
Gunnarsson, I., Aradóttir, E. S., Oelkers, E. H., Clark, D. E., Arnarson, M. Þ., Sigfússon, B., Snæbjörnsdóttir, S. Ó., Matter, J. M., Stute, M., Júlíusson, B. M., et al. (2018) · International Journal of Greenhouse Gas Control · doi:10.1016/j.ijggc.2018.08.014 · Cited by 196
Metadata
- Authors
- Bischoff, J. L., & Seyfried, W. E.
- Venue
- American Journal of Science
- Publisher
- American Journal of Science (AJS)
- Published
- 1978-06-01
- Volume
- 278
- Issue
- 6
- Pages
- 838-860
- ISSN
- 0002-9599 (ISSN-L)
- OpenAlex
- W1970620897
- Cited by
- 341
- References
- 0
- FWCI
- 15.43
- Type
- journal article
- Language
- en
- Open access
- closed
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- Bischoff, J. L., & Seyfried, W. E. (1978). Hydrothermal chemistry of seawater from 25 degrees to 350 degrees C. American Journal of Science. https://doi.org/10.2475/ajs.278.6.838
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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