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Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic)
Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, .ORCID iD: 0000-0002-1298-0320
Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona.
Department of Applied Geological Sciences and Geophysics, University of Leoben.
Department of Earth and Environmental Sciences, George Washington University, .
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2015 (English)In: Mineralium Deposita, ISSN 0026-4598, E-ISSN 1432-1866, Vol. 50, no 1, p. 105-123Article in journal (Refereed) Published
Abstract [en]

Two Ni-laterite profiles from the Loma Caribe peridotite (Dominican Republic) have been investigated for their platinum group element (PGE) geochemistry and mineralogy. One profile (Loma Peguera) is characterized by PGE-enriched (up to 3.5 ppm total PGE) chromitite bodies incorporated within the saprolite, whereas the second profile is chromitite-free (Loma Caribe). Total PGE contents of both profiles slightly increase from parent rocks (36 and 30 ppb, respectively) to saprolite (∼50 ppb) and reach highest levels within the limonite zone (640 and 264 ppb, respectively). Chondrite-normalized PGE patterns of saprolite and limonite reveal rather flat shapes with positive peaks of Ru and Pd. Three types of platinum group minerals (PGM) were found by using an innovative hydroseparation technique: (i) primary PGM inclusions in fresh Cr-spinel (laurite and bowieite), (ii) secondary PGM (e.g., Ru-Fe-Os-Ir compounds) from weathering of preexisting PGM (e.g., serpentinization and/or laterization), and (iii) PGM precipitated after PGE mobilization within the laterite (neoformation). Our results provide evidence that (i) PGM occurrence and PGE enrichment in the laterite profiles is independent of chromitite incorporation; (ii) PGE enrichment is residual on the profile scale; and (iii) PGE are mobile on a local scale leading to in situ growth of PGM within limonite, probably by bioreduction and/or electrochemical metal accretion.

Place, publisher, year, edition, pages
2015. Vol. 50, no 1, p. 105-123
National Category
Geology Geochemistry
Research subject
Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-68078DOI: 10.1007/s00126-014-0520-9OAI: oai:DiVA.org:ltu-68078DiVA, id: diva2:1193534
Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-05-21Bibliographically approved

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