Cited by 31CO2 Sequestration and Geologic InteractionsCalcium Carbonate Crystallization and InhibitionGeochemistry and Elemental Analysis

Precipitation of Ordered Dolomite via Simultaneous Dissolution of Calcite and Magnesite: New Experimental Insights into an Old Precipitation Enigma

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Montes-Hernandez, G., Findling, N., Renard, F., Auzende, A.-L.·2014·Crystal Growth & Design

Abstract

In the present study, we demonstrate that ordered dolomite can be precipitated via simultaneous dissolution of calcite and magnesite under hydrothermal conditions (from 100 to 200 °C). The temperature and high-carbonate alkalinity have significantly copromoted the dolomite formation. For example, when high-purity water was initially used as interacting fluid, only a small proportion of disordered dolomite was identified at 200 °C from XRD patterns and FESEM observations. Conversely, a higher proportion of ordered dolomite, i.e., clear identification of superstructure ordering reflections in XRD patterns, was determined when high-carbonate alkalinity solution was initially used in our system at the same durations of reaction. For this latter case, the dolomite formation is favorable therefrom 100 °C and two kinetic steps were identified: (1) protodolomite formation after about 5 days of reaction, characterized by rounded submicrometric particles from FESEM observations and by the absence of superstructure ordering reflections at 22.02 (101), 35.32 (015), 43.80 (021), etc. 2θ in XRD patterns; (2) protodolomite to dolomite transformation, probably produced by a coupled dissolution–recrystallization process. Herein, the activation energy was estimated to be 29 kJ/mol by using a conventional Arrhenius linear equation. This study provides new experimental conditions to which dolomite could be formed in hydrothermal systems. Temperature and carbonate alkalinity are particularly key physicochemical parameters to promote dolomite precipitation in abiotic systems.

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Crossref · 10.1021/cg401548a

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  • Ordered dolomite can precipitate via simultaneous dissolution of calcite and magnesite under hydrothermal conditions from 100 to 200 °C.

    “Montes-Hernandez et al. [139] proved that ordered dolomite can precipitate via simultaneous dissolution of calcite and magnesite under hydrothermal conditions (from 100 to 200 °C) (CaCO3 + MgCO3) → CaMg(CO3)2.”
  • The transformation from protodolomite to dolomite is probably produced by a coupled dissolution-recrystallization process.

    “second, protodolomite to dolomite transformation, probably produced by a coupled dissolution-recrystallization process.”

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Authors
Montes-Hernandez, G., Findling, N., Renard, F., & Auzende, A.-L.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • Institut des Sciences de la Terre (FR)
  • University of Oslo (NO)
Corresponding author
Montes-Hernandez, G.
Venue
Crystal Growth & Design
Published
2014-01-22
Volume
14
Issue
2
Pages
671-677
ISSN
  • 1528-7483 (ISSN-L)
  • 1528-7505
OpenAlex
W2317048451
Cited by
31
References
21
Citations by year
2026: 6 · 2024: 4 · 2023: 3 · 2022: 2 · 2020: 2 · 2019: 5 · 2018: 3 · 2016: 4 · 2015: 2
FWCI
1.53
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Crystal Growth & Design (publishedVersion)
  • HAL (submittedVersion, other-oa)
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
protodolomite, calcite dissolution, hydrothermal precipitation, carbonate alkalinity, temperature effects, dissolution-recrystallization, activation energy

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