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Fibrous Platinum-Gr...
Fibrous Platinum-Group Minerals in “Floating Chromitites” from the Loma Larga Ni-Laterite Deposit, Dominican Republic
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- Aiglsperger, Thomas (författare)
- Department of Crystallography, Mineralogy, and Ore Deposits, University of Barcelona
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- Proenza, Joaquín A. (författare)
- Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona
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- Longo, Francisco (författare)
- Falcondo Glencore, Santo Domingo
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- Font-Bardia, Mercé (författare)
- Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona
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- Galí, Salvador (författare)
- Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona
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- Roqué, Josep (författare)
- Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona
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- Baurier-Aymat, Sandra (författare)
- Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona
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(creator_code:org_t)
- 2016-11-30
- 2016
- Engelska.
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Ingår i: Minerals. - Basel : MDPI. - 2075-163X. ; 6:4
- Relaterad länk:
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https://www.mdpi.com...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
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- 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 _m) than they are wide (~100 nm). Back-scattered electron (BSE) images suggest that these nanofibers are platinum-group elements (PGE)-bearing and form <5 _m 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 _m 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- Tillämpad geokemi
- Applied Geochemistry
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- art (ämneskategori)
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