Articles | Volume 11, issue 6
https://doi.org/10.5194/se-11-2439-2020
https://doi.org/10.5194/se-11-2439-2020
Research article
 | 
11 Dec 2020
Research article |  | 11 Dec 2020

Understanding controls on hydrothermal dolomitisation: insights from 3D reactive transport modelling of geothermal convection

Rungroj Benjakul, Cathy Hollis, Hamish A. Robertson, Eric L. Sonnenthal, and Fiona F. Whitaker

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Cited articles

Abarca, E., Idiart, A., Grandia, F., Rodríguez-Morillas, N., Pellan, C., Zen, M., Aït-Ettajer, T., and Fontanelli, L.: 3D reactive transport modeling of porosity evolution in a carbonate reservoir through dolomitization, Chem. Geol., 513, 184–199, https://doi.org/10.1016/j.chemgeo.2019.03.017, 2019. 
Agemar, T., Schellschmidt, R., and Schulz, R.: Subsurface temperature distribution in Germany, Geothermics, 44, 65–77, https://doi.org/10.1016/j.geothermics.2012.07.002, 2012. 
Al-Aasm, I.: Origin and characterization of hydrothermal dolomite in the Western Canada Sedimentary Basin, J. Geochem. Explor., 78/79, 9–15, https://doi.org/10.1016/S0375-6742(03)00089-X, 2003. 
Al-Helal, A. B., Whitaker, F. F., and Xiao, Y.: Reactive transport modeling of brine reflux: dolomitization, anhydrite precipitation, and porosity evolution, J. Sediment. Res., 82, 196–215, https://doi.org/10.2110/jsr.2012.14, 2012. 
Armandine Les Landes, A., Guillon, T., Peter-Borie, M., Blaisonneau, A., Rachez, X., and Gentier, S.: Locating Geothermal Resources: Insights from 3D Stress and Flow Models at the Upper Rhine Graben Scale, Geofluids, 2019, 1–24, https://doi.org/10.1155/2019/8494539, 2019. 
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Short summary
Our reactive transport models show that high-temperature fault-controlled dolomite can form from mixed convection and act as a sink for Mg in the circulating seawaters. This provides new perspectives to enhance understanding of mechanisms and controls on dolomitisation, geometry, and spatial distribution of dolomite bodies within faulted and fractured systems, which has important implications for modelling of systems ranging from geothermal resources to ore formation and carbonate diagenesis.