Cited by 296CO2 Sequestration and Geologic InteractionsGeochemistry and Elemental AnalysisHigh-pressure geophysics and materials

Olivine dissolution rates: A critical review

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Oelkers, Eric H., Declercq, Julien, Saldi, Giuseppe D., Gislason, Sigurdur R., Schott, Jacques·2018·Chemical Geology

Abstract

Abstract The dissolution rates of olivine have been considered by a plethora of studies in part due to its potential to aid in carbon storage and the ease in obtaining pure samples for laboratory experiments. Due to the relative simplicity of its dissolution mechanism, most of these studies provide mutually consistent results such that a comparison of their rates can provide insight into the reactivity of silicate minerals as a whole. Olivine dissolution is controlled by the breaking of octahedral M2+-oxygen bonds at or near the surface, liberating adjoining SiO44− tetrahedra to the aqueous fluid. Aqueous species that adsorb to these bonds apparently accelerate their destruction. For example, the absorption of H+, H2O and, at some conditions, selected aqueous organic species will increase olivine dissolution rates. Nevertheless, other factors can slow olivine dissolution rates. Notably, olivine dissolution rates are slowed by lowering the surface area exposed to the reactive aqueous fluid, by for example the presence and/or growth on these surfaces of either microbes or secondary phases. The degree to which secondary phases decelerate rates depends on their ability to limit access of the reactive aqueous fluids to the olivine surface. It seems likely that these surface area limiting processes are very significant in natural systems, lowering olivine surface reactivity in many environments compared to rates measured on cleaned surfaces in the laboratory. A survey of the literature suggests that the major factors influencing forsteritic olivine dissolution rates are 1) pH, 2) water activity, 3) temperature, and 4) mineral-fluid interfacial surface area. Evidence suggests that the effects of aqueous inorganic and organic species are relatively limited, and may be attributed at least in part to their influence on aqueous solution pH. Moreover, the observed decrease in rates due to the presence of secondary mineral coatings and/or the presence of microbes can be attributed to their ability to decrease olivine surface area directly exposed to the reactive aqueous fluid. As the reactivity of forsterite surfaces are spatially heterogeneous, its surface area normalized rates will tend to decrease as it dissolves even in the absence of a mineral or bacterial coating. Each of these factors limits and or influences the application of forsterite dissolution to 1) enhanced weathering efforts, 2) mineral carbonation, and 3) the low temperature generation of hydrogen or hydrocarbons via the oxidation of its divalent iron.

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Crossref · 10.1016/j.chemgeo.2018.10.008

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Research works printed but not linked: 2

  1. [6]6. Bailey, A. (1974) Effect of temperature on the reaction of silicates with aqueous solutions in the low temperature range. First International Symposium on Water-Rock interactions. 1976, Praha, 375-380.
  2. [182]182. Terry, B. and Monhemius, A.J. (1983) Acid dissolution of willemite (((Zn,Mn)2SiO4) and hemimorphite (Zn4Si2O7(OH)2H2O. Metall. Trans. 14-B, 335-346.

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Authors
Oelkers, E. H., Declercq, J., Saldi, G. D., Gislason, S. R., & Schott, J.
Affiliations
Centre National de la Recherche Scientifique (FR)
Venue
Chemical Geology
Publisher
Elsevier BV
Published
2018-11
Volume
500
Pages
1-19
ISSN
0009-2541 (ISSN-L)
OpenAlex
W2895951831
Cited by
296
References
203
Citations by year
2026: 47 · 2025: 59 · 2024: 50 · 2023: 45 · 2022: 41 · 2021: 29 · 2020: 15 · 2019: 10
FWCI
6.79
Type
journal article
Language
en
Open access
Locations
  • Chemical Geology (publishedVersion)
  • Helmholtz Centre for Ocean Research Kiel (GEOMAR) (acceptedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • European Commission (MC-ITN-317235, MC-RTN-35488)
  • Centre National de la Recherche Scientifique
  • Horizon 2020 (764760)
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
Keywords
olivine dissolution, forsterite, dissolution kinetics, mineral-fluid interface, surface area, pH effect, water activity, temperature effects, enhanced weathering, CO2 mineralization, hydrogen production, hydrocarbon generation, iron oxidation

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