A MECHANISM OF MINERAL REPLACEMENT: ISOTOPE TRACING IN THE MODEL SYSTEM KCL-KBR-H2O
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dc.contributor.author | Putnis C.V. | |
dc.contributor.author | Mezger K. | |
dc.date.accessioned | 2022-03-21T07:44:15Z | |
dc.date.available | 2022-03-21T07:44:15Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=12090531 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2004, 68, 13, 2839-2848 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36503 | |
dc.description.abstract | The solid solution-aqueous solution system KCl-KBr-H2O is used as a model system to determine the mechanism of the replacement process of one crystalline phase by another. A single crystal of KBr was allowed to react with a saturated KCl solution enriched in 40K and the resulting new product phases were analyzed for changes in both anion and K isotope composition, using SEM, EDX, microprobe analysis, mass spectrometry and X-ray diffraction. The results show that the new product, K(Cl,Br), contains elements derived from both the original fluid and solid phases, indicating that both anions and K isotopes are exchanged during the replacement reaction. The interface between the advancing reaction front and the original parent crystal is sharp on a micron scale, showing no reaction profile that could indicate a solid state diffusion mechanism. Macroscopically the new phase is turbid due to the development of porosity that is consistent with a net volume deficit replacement reaction and this porosity may act as an indication that a replacement process has taken place. Single crystal X-ray diffraction patterns show the preservation of the crystallographic orientation during the replacement process. The replacement mechanism is interpreted as a result of a coupled process of dissolution and recrystallization occurring at the fluid-crystal interface. | |
dc.title | A MECHANISM OF MINERAL REPLACEMENT: ISOTOPE TRACING IN THE MODEL SYSTEM KCL-KBR-H2O | |
dc.type | Статья |
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