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Sökning: WFRF:(Proenza Joaquín) > Fibrous Platinum-Gr...

  • Aiglsperger, ThomasDepartment of Crystallography, Mineralogy, and Ore Deposits, University of Barcelona (författare)

Fibrous Platinum-Group Minerals in “Floating Chromitites” from the Loma Larga Ni-Laterite Deposit, Dominican Republic

  • Artikel/kapitelEngelska2016

Förlag, utgivningsår, omfång ...

  • 2016-11-30
  • Basel :MDPI,2016
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:ltu-67962
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67962URI
  • https://doi.org/10.3390/min6040126DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Proenza, Joaquín A.Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona (författare)
  • Longo, FranciscoFalcondo Glencore, Santo Domingo (författare)
  • Font-Bardia, MercéDepartament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona (författare)
  • Galí, SalvadorDepartament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona (författare)
  • Roqué, JosepDepartament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona (författare)
  • Baurier-Aymat, SandraDepartament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona (författare)
  • Department of Crystallography, Mineralogy, and Ore Deposits, University of BarcelonaDepartament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:MineralsBasel : MDPI6:42075-163X

Internetlänk

Hitta via bibliotek

  • Minerals (Sök värdpublikationen i LIBRIS)

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