Geological, geochemical and mineralogical characteristics of REE-bearing Las Mercedes bauxite deposit, Dominican Republic

Torró, Lisard; Proenza, Joaquín A.; Aiglsperger, Thomas; Bover‐Arnal, Telm; Villanova-de-Benavent, Cristina; Rodríguez-García, D.; Ramírez, Australia; Rodríguez, Jesús; Mosquea, L.A.; Salas, R.

doi:10.1016/j.oregeorev.2017.06.017

Cited by 41 publications

(27 citation statements)

References 48 publications

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“…On the other hand, weathering has been proven an efficient process for concentrating certain CE. The present study illustrates this point, and economic concentrations of CE have been found in other weathering profiles, soils and laterites worldwide [8,10,11,[74][75][76][77]. In fact, it is well known that the mineral structures of aluminophosphates of the alunite supergroup, such as florencite or goyazite, can concentrate REE at economic grades in lateritised carbonatites and karstic bauxites [74,78,79].…”

Section: Weathered Phosphates As Non-conventional Source Of Critical supporting

confidence: 78%

Critical Elements in Supergene Phosphates: The Example of the Weathering Profile at the Gavà Neolithic Mines, Catalonia, Spain

et al. 2019

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The essential role of Critical Elements (CE) in 21st century economy has led to an increasing demand of these metals and promotes the exploration of non-conventional deposits such as weathering profiles. The present work is focused on the study of a weathering profile located at the Archaeological Park of the Gavà Neolithic Mines, Barcelona, Catalonia, Spain. In the Gavà deposit, acid and oxidising meteoric fluids generated intense weathering during the early Pleistocene, affecting series of Llandoverian black shales and associated syn-sedimentary phosphates. The circulation of these acid fluids at deeper levels of the profile generated supergene vein-like mineralisations comprised of secondary phosphates (e.g., variscite, perhamite, crandallite, phosphosiderite) and sulphates (e.g., jarosite, alunite). This supergene mineralisation is significantly enriched in certain CE (e.g., Ga, Sc, REE, In, Co and Sb) that were mobilised from host rock components and later hosted in the crystal lattice of supergene minerals. Weathering processes and corresponding supergene enrichment of CE at the Gavà deposit could be used as an example to determine exploration guidelines of CE in weathering profiles and associated supergene phosphates worldwide.

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Section: Weathered Phosphates As Non-conventional Source Of Critical supporting

confidence: 78%

Critical Elements in Supergene Phosphates: The Example of the Weathering Profile at the Gavà Neolithic Mines, Catalonia, Spain

et al. 2019

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“…3. Also, many bauxite ore deposits in the World are different from Grebnik's primarily due to their major gibbsite composition, with or without diaspore and boehmite constituents as major or minor (BÁRDOSSY, 1982;ZARASVANDI et al, 2008;MESHRAM & RANDIVE, 2011;JADHAVI et al, 2012;YUSTE et al, 2015;TORRÓ et al, 2017).…”

Section: Comparison With Some Other Bauxite Ore Depositsmentioning

confidence: 99%

Mineralogical and crystallographic characteristics of bauxites from some Grebnik’s (Metohija, Serbia) ore deposits

Cvetković¹,

Tančić²

2019

Geol An Balk Poluos

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Five typical bauxite samples from three ore deposits from the wider area of Grebnik Mt. (Metohija, Serbia) were examined with the optical microscopic, X-ray powder diffraction (XRPD) and chemical methods. The occurrences in bauxites were studied and described and the presence of major minerals was determined: diaspore, boehmite and hematite; minor minerals: quartz, goethite, rutile, kaolinite and hydro-hematite; as well as anatase, brookite, magnetite and chromite, which occur only sporadically. According to the quantity of main Al-bearers, three types of bauxite ore were recognized: diaspore, boehmite and boehmite-diaspore. Unit cell dimensions of major minerals were determined, mostly with values within reference data. However, all of the studied hematites have smaller a 0 and V 0 values, most probably due to the substitution of Fe 3+ by Al 3+. All samples are further classi ied as iron-rich and ferritic bauxites. It was found that there were changes in origin conditions between major Al-hydroxides minerals and hematite, as well as between the diaspore and boehmite. Determined chemical compositions put this raw material into high-quality raw materials for obtaining the electro corundum and alumina. The synthesis of the obtained data indicate that Grebnik's bauxites have some unique characteristics, more or less different from most of the World's known bauxite ore deposits.

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“…However, REE fractionations and redistributions have been reported from various bauxite deposits due to evolution of geochemical systems in various mechanisms and conditions such as mobilization of REE, supergene processes, surficial weathering, diagenetic processes, presence of REEbearing mineral phases, pH of solutions and/or depositional environment, and existence of organic and/or non-organic complexing ligands (Mondillo et al, 2011;Abedini and Calagari, 2013;Mongelli et al, 2014Mongelli et al, , 2016Mongelli et al, , 2017Liu et al, 2016;Buccione et al, 2016;Hou et al, 2017;Khosravi et al, 2017;Long et al, 2017;Radusinovic et al, 2017;Torró et al, 2017;Yuste et al, 2017;Chen et al, 2018). Generally, these Fig.…”

Section: Introductionmentioning

confidence: 99%

Ree mobility and tetrad effects in bauxites an example from the Kanisheeteh deposit, NW Iran

Abedini¹

2019

Acta Geodynamica Et Geomaterialia

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The Kanisheeteh bauxite deposit (NW Iran) is located on the Irano-Himalaya karst bauxite belt and was developed as stratiform horizon along the contact of the Permian and Triassic Formations. Based on absolute weathering index (AWI), HREE were leached out, whereas LREE suffered both leaching and fixation during bauxitization. The non-CHARAC characteristic of Y/Ho ratios can be attributed to geochemically known phenomenon as the "tetrad effect". The simultaneous convex and concave curves of the tetrad effect were observed in the chondritenormalized REE patterns of the bauxite ores. The correlation between the sizes of T 4 and AWI% values revealed two separate populations. The first one is characterized by a wide variation in sizes of T 4 and very narrow AWI% values, and is thought to be related to acidic zone of the profile. In contrast, the second one is marked by a narrow variation in sizes of T 4 and wide variation in AWI% values, and is conceived to be affiliated to alkaline zone of the profile. In this research, the tetrad effect proved to be capable of clarifying the geochemical characteristics of the deposit and can be applied as a good geochemical index to investigate the prevailed paleoconditions of depositional environments.

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Geological, geochemical and mineralogical characteristics of REE-bearing Las Mercedes bauxite deposit, Dominican Republic

Cited by 41 publications

References 48 publications

Critical Elements in Supergene Phosphates: The Example of the Weathering Profile at the Gavà Neolithic Mines, Catalonia, Spain

Critical Elements in Supergene Phosphates: The Example of the Weathering Profile at the Gavà Neolithic Mines, Catalonia, Spain

Mineralogical and crystallographic characteristics of bauxites from some Grebnik’s (Metohija, Serbia) ore deposits

Ree mobility and tetrad effects in bauxites an example from the Kanisheeteh deposit, NW Iran

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