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http://hdl.handle.net/2445/151708
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DC Field | Value | Language |
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dc.contributor.author | Aiglsperger, Thomas Hans | - |
dc.contributor.author | Proenza Fernández, Joaquín Antonio | - |
dc.contributor.author | Longo, Francisco | - |
dc.contributor.author | Font Bardia, Ma. Mercedes | - |
dc.contributor.author | Galí Medina, Salvador, 1949- | - |
dc.contributor.author | Roqué, Josep | - |
dc.contributor.author | Baurier Aymat, Sandra | - |
dc.date.accessioned | 2020-03-02T17:33:01Z | - |
dc.date.available | 2020-03-02T17:33:01Z | - |
dc.date.issued | 2016-11-30 | - |
dc.identifier.issn | 2075-163X | - |
dc.identifier.uri | http://hdl.handle.net/2445/151708 | - |
dc.description.abstract | This contribution reports on the observation of enigmatic fibrous platinum-group minerals (PGM) found within a chromitite body included in limonite ("floating chromitite") from Ni-laterites in the Dominican Republic. Fibrous PGM have a Ru-Os-Ir-Fe dominated composition and are characterized by fibrous textures explained by grain-forming fibers which are significantly longer (1-5 µm) than they are wide (~100 nm). Back-scattered electron (BSE) images suggest that these nanofibers are platinum-group elements (PGE)-bearing and form <5 µm thick layers of bundles which are oriented orthogonal to grains' surfaces. Trace amounts of Si are most likely associated with PGE-bearing nanofibers. One characteristic fibrous PGM was studied in detail: XRD analyses point to ruthenian hexaferrum. However, the unpolished fibrous PGM shows numerous complex textures on its surface which are suggestive for neoformation processes: (i) features suggesting growth of PGE-bearing nanofibers; (ii) occurrence of PGM nanoparticles within film material (biofilm?) associated with PGE-bearing nanofibers; (iii) a Si-rich and crater-like texture hosting PGM nanoparticles and an Ir-rich accumulation of irregular shape; (iv) complex PGM nanoparticles with ragged morphologies, resembling sponge spicules and (v) oval forms (<1 µm in diameter) with included PGM nanoparticles, similar to those observed in experiments with PGE-reducing bacteria. Fibrous PGM found in the limonite may have formed due to supergene (bio-)weathering of fibrous Mg-silicates which were incorporated into desulphurized laurite during stages of serpentinization. | - |
dc.format.extent | 11 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | MDPI | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.3390/min6040126 | - |
dc.relation.ispartof | Minerals, 2016, vol. 6, num. 4, p. 126 | - |
dc.relation.uri | https://doi.org/10.3390/min6040126 | - |
dc.rights | cc-by (c) Aiglsperger, Thomas Hans et al., 2016 | - |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es | - |
dc.source | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) | - |
dc.subject.classification | Fibres tèxtils | - |
dc.subject.classification | República Dominicana | - |
dc.subject.classification | Meteorització química | - |
dc.subject.other | Textile fibers | - |
dc.subject.other | Dominican Republic | - |
dc.subject.other | Chemical weathering | - |
dc.title | Fibrous platinum-group minerals in 'floating chromitites' from the Loma Larga Ni-laterite deposit, Dominican Republic | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 665508 | - |
dc.date.updated | 2020-03-02T17:33:01Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
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File | Description | Size | Format | |
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665508.pdf | 6.87 MB | Adobe PDF | View/Open |
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