MICROSCOPIC EFFECTS OF CARBONATE, MANGANESE, AND STRONTIUM IONS ON CALCITE DISSOLUTION
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Lea A.S. | |
dc.contributor.author | Amonette J.E. | |
dc.contributor.author | Baer D.R. | |
dc.contributor.author | Liang Y. | |
dc.contributor.author | Colton N.G. | |
dc.date.accessioned | 2021-02-10T01:44:59Z | |
dc.date.available | 2021-02-10T01:44:59Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=548917 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2001, 65, 3, 369-379 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24587 | |
dc.description.abstract | Aqueous dissolution of the (1014) surface of calcite was observed at pH near 9 by using an atomic force microscope equipped with a fluid cell. The influences of carbonate (CO32-), strontium (Sr2+), and manganese (Mn2+) ion concentrations on the rates of step motion were measured. Carbonate ions were shown to have a step-specific effect on calcite dissolution. At low levels (<1 ) of co32-, the retreat rate of the more structurally open [441]+ steps was faster than the retreat rate of the structurally confined [441]- steps, leading to anisotropic dissolution. Increasing the CO32- level to as high as 900 μM decreased the rate of retreat of both steps, but the [441]+ step was slowed to a much greater extent changing the degree of dissolution anisotropy. This decrease in step velocity at high CO32- levels was attributed to a corresponding increase in the back reaction (i.e., precipitation) as the solution approached saturation with respect to calcite. Strontium cations were also shown to have a step-specific effect on calcite dissolution similar to that of CO32-. Manganese cations, on the other hand, slowed the rate of retreat of the [441]- step to a greater extent than Sr2+. The influence of impurity metal sorption on dissolution is examined in terms of sorption at kinks and the dissolution behavior is explained in terms of a terrace-ledge-kink site-blocking model. Evidence is given to support the hypothesis that ion-pairs formed in solution are the primary growth units for calcite. | |
dc.title | MICROSCOPIC EFFECTS OF CARBONATE, MANGANESE, AND STRONTIUM IONS ON CALCITE DISSOLUTION | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru