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http://hdl.handle.net/2445/160531
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DC Field | Value | Language |
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dc.contributor.author | Villanova de Benavent, Cristina | - |
dc.contributor.author | Nieto, Fernando | - |
dc.contributor.author | Viti, Cecilia | - |
dc.contributor.author | Proenza Fernández, Joaquín Antonio | - |
dc.contributor.author | Galí Medina, Salvador, 1949- | - |
dc.contributor.author | Roqué, Josep | - |
dc.date.accessioned | 2020-05-15T12:02:52Z | - |
dc.date.available | 2020-05-15T12:02:52Z | - |
dc.date.issued | 2016-05-01 | - |
dc.identifier.issn | 0003-004X | - |
dc.identifier.uri | http://hdl.handle.net/2445/160531 | - |
dc.description.abstract | Ni-bearing magnesium phyllosilicates (garnierites) are significant Ni ores in Ni-laterites worldwide. The present paper reports a detailed TEM investigation of garnierites from the Falcondo Ni-laterite deposit (Dominican Republic). Different types of garnierites have been recognized, usually consisting of mixtures between serpentine and talc-like phases that display a wide range of textures at the nano meter scale. In particular, chrysotile tubes, polygonal serpentine, and lizardite lamellae are intergrown with less crystalline, talc-like lamellae. Samples consisting uniquely of talc-like and of sepiolite-falcondoite were also observed, occurring as distinctive thin lamellae and long ribbon-shaped fibers, respectively. HRTEM imaging indicates that serpentine is replaced by the talc-like phase, whereas TEM-AEM data show preferential concentration of Ni in the talc-like phase. We suggest, therefore, that the crystallization of Ni-bearing phyllosilicates is associated with an increase in the silica activity of the system, promoting the replacement of the Ni-poor serpentine by the Ni-enriched talc-like phase. These results have interesting implications in material science, as garnierites are natural analogs of Ni-bearing phyllosilicate-supported synthetic catalysts. Finally, SAED and HRTEM suggest that the Ni-bearing talc-like phase corresponds to a variety of talc with extra water, showing larger d(001) than talc (i.e., 9.2-9.7 angstrom), described as 'kerolite'-'pimelite' in clay mineral literature. | - |
dc.format.extent | 40 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Mineralogical Society of America | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.2138/am-2016-5518 | - |
dc.relation.ispartof | American Mineralogist, 2016, vol. 101, num. 6, p. 1460-1473 | - |
dc.relation.uri | https://doi.org/10.2138/am-2016-5518 | - |
dc.rights | (c) Mineralogical Society of America, 2016 | - |
dc.source | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) | - |
dc.subject.classification | Níquel | - |
dc.subject.classification | Mineralogia | - |
dc.subject.classification | República Dominicana | - |
dc.subject.other | Nickel | - |
dc.subject.other | Mineralogy | - |
dc.subject.other | Dominican Republic | - |
dc.title | Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): Mineralogy, nanotextures, and formation mechanisms by HRTEM and AEM | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 675058 | - |
dc.date.updated | 2020-05-15T12:02:52Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
Files in This Item:
File | Description | Size | Format | |
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675058.pdf | 4.08 MB | Adobe PDF | View/Open |
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