IN SITU AFM STUDY OF THE DISSOLUTION AND RECRYSTALLIZATION BEHAVIOUR OF POLISHED AND STRESSED CALCITE SURFACES
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dc.contributor.author | Bisschop J. | |
dc.contributor.author | Dysthe D.K. | |
dc.contributor.author | Putnis C.V. | |
dc.contributor.author | Jamtveit B. | |
dc.date.accessioned | 2024-08-22T05:32:28Z | |
dc.date.available | 2024-08-22T05:32:28Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=12091860 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2006, 70, 7, 1728-1738 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/44698 | |
dc.description.abstract | We investigated the dissolution behaviour of polished calcite surfaces in situ using a fluid-cell atomic force microscope. Polished calcite surfaces enabled us to study the effects of applied surface stress and crystallographic orientation on calcite dissolution pattern formation. Thin-sections of Iceland spar single-crystals polished either parallel or with a 5? miscut angle to {101?4} cleavage planes were studied. Compressive surface stresses of up to 50 MPa were applied to some of the thin-section samples by means of elastic concave bending. Experiments were carried out in semi-stagnant deionized water under mainly transport limited dissolution conditions. Samples polished parallel to {101?4} cleavage planes dissolved by the formation of etch-pits originating from polishing defects. The dissolution behaviour of 5? miscut surfaces was relatively unaffected by polishing defects, since no etch-pits developed in these samples. Dissolution of the miscut samples led to stepped or rippled surface patterns on the nanometer scale that coarsened during the first 30-40 min of the experiments. Possible reasons for the pattern-coarsening were: (i) progressive bunching of retreating dissolution steps and (ii) surface energy driven recrystallization (Ostwald ripening) under transport limited dissolution conditions. A flat polished miscut surface in calcite may recrystallize into a hill-and-valley structure in a (near-)saturated solution so as to lower its total surface free energy in spite of a larger surface area. No clear effect of applied stress on dissolution pattern formation has been observed. ? 2006 Elsevier Inc. All rights reserved. | |
dc.subject | CALCITE | |
dc.subject | DISSOLUTION | |
dc.subject | RECRYSTALLIZATION | |
dc.title | IN SITU AFM STUDY OF THE DISSOLUTION AND RECRYSTALLIZATION BEHAVIOUR OF POLISHED AND STRESSED CALCITE SURFACES | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2005.12.013 |
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