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Geochemistry of platinum-group elements (PGE) in Cerro Matoso and Planeta Rica Ni-laterite deposits, northern Colombia

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doi: 10.18268/BSGM2020v72n3a201219
Authors:Tobón, Mónica; Weber, Marion; Proenza, Joaquín A.; Aiglsperger, Thomas; Betancur, Sebastián; Farré-de-Pablo, Júlia; Ramírez, Carlos; Pujol-Solà, Núria
Author Affiliations:Primary:
Universidad Nacional de Colombia, Departamento de Materiales y Minerals, Medellin, Colombia
Other:
Pontifical Catholic University of Peru, Peru
Recursos del Caribe, United States
Universitat de Barcelona, Spain
Lulea University of Technology, Sweden
Volume Title:Mineral deposits of Latin America and the Caribbean
Volume Authors:Proenza, Joaquín Antonio, editor; Torró, Lisard; Nelson, Carl E.
Source:Mineral deposits of Latin America and the Caribbean, edited by Joaquín Antonio Proenza, Lisard Torró and Carl E. Nelson. Boletín de la Sociedad Geológica Mexicana, 72(3). Publisher: Sociedad Geológica Mexicana, Mexico, D.F., Mexico. ISSN: 0366-1784
Publication Date:2020
Note:In English with English and Spanish summaries. 68 refs.; illus., incl. geol. sketch maps, sects., 2 tables
Summary:Platinum-group elements (PGE) are included among the so-called critical metals, and are essential metals for the technological industry. However, there are very few deposits in the world from which these metals can be extracted. The present work investigates three Ni-laterite profiles (hydrous Mg silicate type) formed over the ultramafic rocks of Cerro Matoso and Planeta Rica in Colombia. The main goal is to determine their PGE concentration and distribution, as well as to identify the carrier phases of these noble metals. The highest PGE contents in Cerro Matoso and Planeta Rica are concentrated in the limonite horizon (141-272 ppb), showing a strong decrease towards the saprolite and the underlying serpentinized peridotite (parent rock; < 50 ppb). The highest concentrations correspond to Pt>Ru>Pd and the lowest to Rh<Os<Ir. Such distribution indicates that PGE are mobilized in different proportions by the laterization processes. The high affinity between PGE and Fe favors the formation of PGE-Fe mineral alloys such as the Pt-IrFe-Ni minerals hosted by Fe-oxyhydroxide found in the limonite-saprolite transition zone in Planeta Rica. In addition, in the same zone, nanoparticles of Pt (< 1 µm) were found within framboidal pyrite. Both types of platinum group minerals (PGM) are secondary in origin. In the case of Pt-IrFe-Ni alloys, this interpretation is supported by their morphology and chemical composition, which is comparable with PGE-Fe-Ni alloys found in laterites of Dominican Republic. In the case of Pt nanoparticle, textural relations suggest the neoformation of PGM adhered to the porous edges of altered pyrite. Cerro Matoso and Planeta Rica should be considered as unconventional PGE deposits, if adequate recovery processes can be applied for their recovery as by-products during Ni (+Co) production.
Subjects:Accretion; Allochthons; Alloys; Andean Orogeny; Byproducts; Cenozoic; Concentration; Continental margin; Copper ores; Discontinuities; Eh; Enrichment; Eocene; Framboidal texture; Heavy metals; Hydroxides; ICP mass spectra; Igneous rocks; Industry; Intrusions; Iron; Laterites; Limonite; Mass spectra; Metal ores; Metals; Mobility; Mobilization; Nickel ores; Oxides; Oxyhydroxides; Paleogene; Peridotites; Platinum group; Plutonic rocks; Precipitation; Pyrite; Pyrite ores; Recovery; Saprolite; Siderophile elements; Soils; Spectra; Sulfides; Suture zones; Tertiary; Textures; Transition zones; Ultramafics; Weathering; X-ray fluorescence spectra; Antilles; Caribbean region; Colombia; Dominican Republic; Greater Antilles; Hispaniola; Magdalena Valley; San Jorge Basin; South America; West Indies; Cerro Matoso Colombia; Planeta Rica Colombia; San Jacinto fold belt
Coordinates:N070000 N080000 W0750000 W0800000
Record ID:897043-6
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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