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Coupled fluctuations in element release during dolomite dissolution
Published online by Cambridge University Press: 05 July 2018
Abstract
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Atomic force microscopy has been used to determine more precisely the mechanism of the initial stages of dolomite dissolution. Analysis of outflow solutions initially shows fluctuations of both Ca and Mg release with concentrations of Ca >> Mg. The dolomite surface dissolves congruently in the presence of slightly acidified water as confirmed by the regular spreading of characteristic rhombohedral etch pits. Direct in situ observations show that a new phase precipitates on the dissolving surface simultaneously. As the Ca and Mg release decreases with time, the precipitated phase can be seen to spread across the dolomite surface. These observations indicate that the apparent incongruent dissolution of dolomite is a two-step process involving stoichiometric dissolution with the release of Ca, Mg and CO3 ions to solution at the mineral–fluid interface coupled with precipitation of a new Mg-carbonate phase. The coupled element release confirms the interface-coupled dissolutionprecipitation mechanism.
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© [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
References
Arvidson, R.S., Collier, M., Davis, K.J., Vinson, M.D., Amonette, J.E. and Luttge, A. (2006) Magnesium inhibition of calcite dissolution kinetics. Geochimica et Cosmochimica Acta, 70, 583–594.CrossRefGoogle Scholar
Busenberg, E. and Plummer, L.N. (1982) The kinetics of dissolution of dolomite in CO2-H2O systems at 1.5 to 65ºC and 0 to 1 atm PCO2
. American Journal of Science, 282, 45–78.CrossRefGoogle Scholar
Gautelier, M., Oelkers, E.H. and Schott, J. (1999) An experimental study of dolomite dissolution rates as a function of pH from –0.5 to 5 and temperature from 25 to 80ºC. Chemical Geology, 157, 13–26.CrossRefGoogle Scholar
Hellmann, R., Wirth, R., Daval, D., Barnes, J.P., Penisson, J.M., Tisserand, D., Epicier, T., Florin B. and Hervig, R.L. (2012) Unifying natural and laboratory chemical weathering with interfacial dissolution-reprecipitation: A study based on nanometer- scale chemistry of fluid-silicate interfaces. Chemical Geology, 294–295, 203–216.CrossRefGoogle Scholar
Hövelmann, J., Putnis, C.V., Ruiz-Agudo, E. and Austrheim, H. (2012) Direct nanoscale observations of CO2 sequestration during brucite [Mg(OH)2] dissolution. Environmental Science and Technology, 46, 5253–5260.CrossRefGoogle ScholarPubMed
Liang, Y., Baer, D.R., McCoy, J.M., Amonette, J.E. and LaFemina, J.P. (1996) Dissolution kinetics at the cal c i te-wat e r int erfa c e. Geochimica et Cosmochimica Acta, 60, 4883–4887.CrossRefGoogle Scholar
Lüttge, A., Winkler, U. and Lasaga, A.C. (2003) Interferometric study of the dolomite dissolution: a new conceptual model for mineral dissolution. Geochimica et Cosmochimica Acta, 67, 1099–1116.CrossRefGoogle Scholar
Mackenzie, F.T. and Andersson, A.J. (2013) The marine carbon system and ocean acidification during Phanerozoic time. Geochemical Perspectives, 2, 1–227.CrossRefGoogle Scholar
Morse, J.W. and Arvidson, R.S. (2002) The dissolution kinetics of major sedimentary carbonate minerals. Earth Science Reviews, 58, 51–84.CrossRefGoogle Scholar
Parkhurst, D.L. and Appelo, C.A.J. (1999) Users guide to PHREEQC (version 2) – a computer program for speciation, batch reaction, one-dimensional transport, and inverse geochemical calculations.
U.S. Geological Survey Water-Resources Investigation Report, 99–4259.Google Scholar
Pokrovsky, O.S. and Schott, J. (2001) Kinetics and mechanism of dolomite dissolution in neutral to alkaline solutions revisited. American Journal of Science, 301, 597–626
CrossRefGoogle Scholar
Pokrovsky, O.S., Golubev, S.V. and Schott, J. (2005) Dissolution kinetics of calcite, dolomite and magnesite at 25ºC and 0 to 50 atm pCO2
. Chemical Geology, 217, 239–255.CrossRefGoogle Scholar
Putnis, A. (2009) Mineral replacement reactions. Pp. 87–124 in: Thermodynamics and Kinetics of Water– Rock Interactions (E.H. Oelkers and J. Schott, editors). Reviews in Mineralogy and Geochemistry, 70, Mineralogical Society of America, and the Geochemical Society, Chantilly, Virginia, USA.Google Scholar
Putnis, C.V. and Ruiz-Agudo, E. (2013) The mineral– water interface: where minerals react with the environment. Elements, 9, 177–182.CrossRefGoogle Scholar
Ruiz-Agudo, E. and Putnis, C.V. (2012) Direct observations of mineral–fluid reactions using atomic force microscopy: the specific example of calcite. Mineralogical Magazine, 76, 227–253.CrossRefGoogle Scholar
Ruiz-Agudo, E., Putnis, C.V., Rodriguez-Navarro, C. and Putnis, A. (2012) Mechanism of leached layer formation during chemical weathering of silicate minerals. Geology, 40, 947–950.CrossRefGoogle Scholar
Shiraki, R., Rock, P.A. and Casey, W.H. (2000) Dissolution kinetics of calcite in 0.1 M NaCl solution at room temperature: An atomic force microscopic (AFM) study. Aquatic Geochemistry, 6, 87–108.CrossRefGoogle Scholar
Urosevic, M., Rodriguez-Navarro C., Putnis, C.V., Cardell, C., Putnis, A. and Ruiz-Agudo, E. (2012) In situ nanoscale observations of the dissolution of {10
4} dolomite cleavage surfaces. Geochimica et Cosmochimica Acta, 80, 1–13.CrossRefGoogle Scholar
4} dolomite cleavage surfaces. Geochimica et Cosmochimica Acta, 80, 1–13.CrossRefGoogle Scholar
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