DEHYDROXYLATION OF FE3+, MG-RICH DIOCTAHEDRAL MICAS: (II) CATION MIGRATION
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dc.contributor.author | Muller F. | |
dc.contributor.author | Drits V.A. | |
dc.contributor.author | Tsipursky S.I. | |
dc.contributor.author | Plancon A. | |
dc.date.accessioned | 2021-01-29T07:14:09Z | |
dc.date.available | 2021-01-29T07:14:09Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=13836763 | |
dc.identifier.citation | Clay Minerals, 2000, 35, 3, 505-514 | |
dc.identifier.issn | 0009-8558 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24033 | |
dc.description.abstract | The quantitative interpretation of the reflection intensities of the SAED patterns of glauconites reveals the mechanism of migration of the octahedral sheet cations during heating up to 750°C. It confirms that Mg2+ has a greater ability than Fe3+ to migrate from cis- to trans-sites, as previously found by means of XRD pattern modelling. For samples heated to 650°C, the two formerly vacant trans-sites in the base-centred unit-cell become occupied, but differently, which leads to a primitive unit-cell, and the cis- sites remain filled almost entirely by Fe3+ only. The cation migration occurs through the nearest shared edges in the (010) and (310) directions. The samples heated to 750°C reveal a base-centred super-cell with A = 3 a and B = b. All Mg cations leave the cis sites to occupy completely four of the six available trans-sites of the super-cell. Migration also occurs through the shared edges in the (010) and (310) directions. The primitive unit-cell is not an intermediate step in the migration process leading to the super-cell. The existence of additional satellites in the SAED patterns of some crystals heated to 750°C corresponds to the existence of antiphase domains with a 3b/2 width and an antiphase shift of a/2. | |
dc.title | DEHYDROXYLATION OF FE3+, MG-RICH DIOCTAHEDRAL MICAS: (II) CATION MIGRATION | |
dc.type | Статья |
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