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Geochemistry and Mineralogy of Rare Earth Elements (REE) in Bauxitic Ores of the Catalan Coastal Range, NE Spain
Institute of Mineralogy, Technische Universität Bergakademie Freiberg, Germany;Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona (UB), Spain; Institute of Applied Mineralogy and Economic Geology (IML), RWTH Aachen University, Germany.
Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona (UB), Spain.ORCID-id: 0000-0001-8738-7305
Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona (UB), Spain;School of Environment and Technology (SET), University of Brighton, UK.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik. Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona (UB), Spain.ORCID-id: 0000-0002-1298-0320
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2018 (Engelska)Ingår i: Minerals, ISSN 2075-163X, E-ISSN 2075-163X, Vol. 8, nr 12, artikel-id 562Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Karst bauxite deposits are currently investigated as a new resource for rare earth elements (REE) in order to avoid present and future supply shortfalls of these critical metals. The present work focuses on the geochemistry and mineralogy of the REE in karst bauxite deposits of the Catalan Coastal Range (CCR), NE-Spain. It is revealed that the studied bauxitic ores have a dominant breccia and local ooido-pisoidic and pelitomorphic texture. The bauxitic ores are mostly composed of kaolinite and hematite, as well as of lesser amounts of boehmite, diaspore, rutile and calcite. The mineralogy and major element composition indicate incomplete bauxitization of an argillaceous precursor material possibly derived from the erosion of the Mesozoic Ebro massif paleo-high. The studied bauxites are characterized by ∑REE (including Sc, Y) between 286 and 820 ppm (av. 483 ppm) and light REE to heavy REE (LREE/HREE) ratios up to 10.6. REE are mainly concentrated in phosphate minerals, identified as monazite-(Ce) and xenotime-(Y) of detrital origin and unidentified REE-phosphates of a possible authigenic origin. REE remobilization presumably took place under acidic conditions, whereas REE entrapment in the form of precipitation of authigenic rare earth minerals from percolating solutions was related to neutral to slightly alkaline conditions. During the bauxitization process no significant REE fractionation took place and the REE distribution pattern of the bauxitic ores was governed by the REE budget of the precursor material. Finally, adsorption as a main REE scavenging mechanism in the studied CCR bauxite deposits should not be considered, since the presented data did not reveal significant REE contents in Fe-and Mn-oxyhydroxides and clay minerals.

Ort, förlag, år, upplaga, sidor
MDPI, 2018. Vol. 8, nr 12, artikel-id 562
Nyckelord [en]
karst bauxite, rare earth elements, monazite, xenotime, geochemistry, mineralogy, Catalonia, Spain
Nationell ämneskategori
Naturvetenskap Geologi
Forskningsämne
Tillämpad geokemi
Identifikatorer
URN: urn:nbn:se:ltu:diva-71980DOI: 10.3390/min8120562ISI: 000455073100022OAI: oai:DiVA.org:ltu-71980DiVA, id: diva2:1269277
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Validerad;2019;Nivå 2;2019-01-11 (marisr)

Tillgänglig från: 2018-12-10 Skapad: 2018-12-10 Senast uppdaterad: 2019-01-28Bibliografiskt granskad

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Reinhardt et al. 2018(9270 kB)6 nedladdningar
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Aiglsperger, Thomas

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Proenza, Joaquín A.Aiglsperger, ThomasTorró, Lisard
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