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CO2 mineralization by olivine at hydrothermal conditions

Published online by Cambridge University Press:  05 July 2018

Jan Přikryl  and
Andri Stefánsson
Jan Přikryl*
Affiliation:
Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland
Andri Stefánsson
Affiliation:
Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland
*
* E-mail: jap5@hi.is
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Abstract

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The interaction of CO2-rich water with olivine was studied using geochemical reaction modelling in order to gain insight into the effects of temperature, acid supply (CO2) and extent of reaction on the secondary mineralogy, water chemistry and mass transfer. Olivine (Fo93) was dissolved at 150 and 250ºC and pCO2 of 2 and 20 bar in a closed system and an open system with secondary minerals allowed to precipitate. The progressive water–rock interaction resulted in increased solution pH, with gradual carbonate formation starting at pH 5 and various Mg-OH and Mg-Si minerals becoming dominant at pH>8. The major factor determining olivine alteration is the pH of the water. In turn, the pH value is determined by acid supply, reaction progress and temperature.

Keywords

CO2olivinereaction modellingwater–rock interaction
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 6 , November 2014 , pp. 1473 - 1477
Creative Commons
Creative Common License - CCCreative Common License - BY
© [2014] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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