Cited by 192Crystallization and Solubility StudiesCalcium Carbonate Crystallization and InhibitionGeochemistry and Elemental Analysis

Fluid supersaturation and crystallization in porous media

Putnis, Andrew, Prieto, Manuel, Fernandez-Diaz, Lurdes·1995·Geological Magazine

Abstract

The relationship between the supersaturation at the point of crystallization and the rate at which supersaturation increases has been studied from nucleation experiments on barite BaSO 4, strontianite SrCO 3, witherite BaCO 3 and gypsum CaSO 4.2H 2 O. The crystallization experiments have been carried out by the counter-diifusion of cations and anions through a column of porous silica gel transport medium. Nucleation is suppressed in a finely-porous medium resulting in very high values of supersaturation before crystallization from the solution begins. This threshold supersaturation for nucleation depends on the solubility of the salt, the porosity of the medium and the supersaturation rate. Nucleation inhibitors were used to extend the range of supersaturation attainable. In all cases the experimental data fits the general expression: rate of change of supersaturation ∝ (threshold supersaturation)m. These results are compared to previous work from the field of chemical engineering on the relationship between supersaturation, volume and cooling rate in aqueous salt solutions. These experiments have important implications to supersaturation in natural fluids and subsequent crystallization in relation to geological problems including crystallization in low temperature sedimentary environments and fluid-rock ratios in hydrothermal mineral deposits.

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Crossref · 10.1017/s0016756800011389

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  • The decrease in crystal sizes was expected due to the lower solubilities of Mn-rich carbonates in comparison to Ca-rich carbonates, i.e., the less soluble Mn-rich phases were more metastable; consequently, they crystallized at a higher supersaturation.

    “This decrease in crystal sizes was expected due to the lower solubilities of Mn-rich carbonates in comparison to Ca-rich carbonates, i.e., the less soluble Mn-rich phases were more metastable; consequently, they crystallized at a higher supersaturation [24].”

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Authors
Putnis, A., Prieto, M., & Fernandez-Diaz, L.
Affiliations
University of Cambridge (GB)
Venue
Geological Magazine
Published
1995-01
Volume
132
Issue
1
Pages
1-13
ISSN
  • 0016-7568 (ISSN-L)
  • 1469-5081
OpenAlex
W2159360168
Cited by
192
References
50
Citations by year
2026: 4 · 2025: 7 · 2024: 6 · 2023: 5 · 2022: 6 · 2021: 13 · 2020: 7 · 2019: 9 · 2018: 7 · 2017: 6 · 2016: 8 · 2015: 6 · 2014: 12 · 2013: 10 · 2012: 7
FWCI
1.99
Type
journal article
Language
en
Open access
closed
Locations
Geological Magazine (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
crystallization, porous media, nucleation, counter-diffusion, silica gel column, barite, strontianite, witherite, gypsum, porosity, cooling rate, hydrothermal deposits

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