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The geochemistry of basalt-sea-water interactions: evidence from Deception Island, Antarctica, and Reykjanes, Iceland

Published online by Cambridge University Press:  05 July 2018

H. Elderfield ,
E. Gunnlaugsson ,
S. J. Wakefield  and
P. T. Williams
H. Elderfield
Affiliation:
Department of Earth Sciences, The University of Leeds, Leeds LS2 9JT, Gt. Britain
E. Gunnlaugsson
Affiliation:
Department of Earth Sciences, The University of Leeds, Leeds LS2 9JT, Gt. Britain
S. J. Wakefield
Affiliation:
Department of Earth Sciences, The University of Leeds, Leeds LS2 9JT, Gt. Britain
P. T. Williams
Affiliation:
Department of Earth Sciences, The University of Leeds, Leeds LS2 9JT, Gt. Britain
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Summary

Sea-water from Deception Island was found to contain 0·55–1·48 mg Mn 1−1 and 10·2-64·3 mg Si 1−1. Reaction of Deception Island basalt and sea-water at 190 °C and 500 bars simulated the measured water composition but leaching experiments suggest that much of the Mn etc. may derive from local volcanic ash. Mn and Mg in thermal waters at Reykjanes have concentrations compatible with equilibrium with components of montmorillonite present as an alteration mineral of average composition . However, Fe is controlled by equilibrium with sulphides. Flux calculations based on these and other data place upper limits on hydrothermal Mn input to the oceans of 5–36×1011 g yr−1 and Mn accumulation in metalliferous sediments of 2–9×1011 g yr−1.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 318 , June 1977 , pp. 217 - 226
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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