Coupled fluctuations in element release during dolomite dissolution
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...
| Main Authors: | , , |
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| Format: | Journal Article |
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Mineralogical Society
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/45442 |
| _version_ | 1848757285179883520 |
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| author | Putnis, Christine Ruiz-Agudo, E. Hövelmann, J. |
| author_facet | Putnis, Christine Ruiz-Agudo, E. Hövelmann, J. |
| author_sort | Putnis, Christine |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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 dissolution-precipitation mechanism. |
| first_indexed | 2025-11-14T09:25:40Z |
| format | Journal Article |
| id | curtin-20.500.11937-45442 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:25:40Z |
| publishDate | 2014 |
| publisher | Mineralogical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-454422017-09-13T14:22:51Z Coupled fluctuations in element release during dolomite dissolution Putnis, Christine Ruiz-Agudo, E. Hövelmann, J. 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 dissolution-precipitation mechanism. 2014 Journal Article http://hdl.handle.net/20.500.11937/45442 10.1180/minmag.2014.078.6.01 Mineralogical Society restricted |
| spellingShingle | Putnis, Christine Ruiz-Agudo, E. Hövelmann, J. Coupled fluctuations in element release during dolomite dissolution |
| title | Coupled fluctuations in element release during dolomite dissolution |
| title_full | Coupled fluctuations in element release during dolomite dissolution |
| title_fullStr | Coupled fluctuations in element release during dolomite dissolution |
| title_full_unstemmed | Coupled fluctuations in element release during dolomite dissolution |
| title_short | Coupled fluctuations in element release during dolomite dissolution |
| title_sort | coupled fluctuations in element release during dolomite dissolution |
| url | http://hdl.handle.net/20.500.11937/45442 |