Regolith-hosted rare earth genesis under humid climates in the Coastal Cordillera of the Central Andes

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dc.catalogadorpau
dc.contributor.authorBustos, Nicolas
dc.contributor.authorMarquardt R., Carlos
dc.contributor.authorRoquer, Tomas
dc.contributor.authorVergara, Paulina
dc.date.accessioned2025-04-04T14:43:07Z
dc.date.available2025-04-04T14:43:07Z
dc.date.issued2023
dc.description.abstractRegolith-hosted rare earth element deposits (RH-REE) have been recently found in Chile, nonetheless their ore formation controls, which include temperate to arid climate, intrusive rocks with weatherable REE minerals, and gentle slopes or pediplains, among others, differ from the most common deposits in Asia. This work addresses mineralization and exploration methods for RH-REE deposits across the Chilean Coastal Range. The studied prospect is associated with late Carboniferous I-type tonalitic intrusions. Mineralogical analysis (TIMA-X) indicates that allanite and monazite are the main REE-bearing minerals in the host rock. The regolith in the study area is up to 60 m deep and contains an exchangeable-REE concentration up to 2000 ppm, as determined by portable X-ray fluorescence (pXRF) and ICP-MS. We were able to recognize that REE-adsorption takes place both in preserved and partially eroded regoliths. Progressive weathering of these regoliths causes the pedolith/saprolith limit to be dynamic and accumulate REE due to the breakdown of allanite and monazite. Our data shows that the search for pediplains on suitable lithologies, mapping of regolith profiles, and their analysis via pXRF by quantifying yttrium, appears to be a suitable strategy for early exploration of RH-REE deposits in the Chilean Coastal Range.
dc.format.extent4 páginas
dc.fuente.origenORCID
dc.identifier.isbn9782839940450
dc.identifier.urihttps://sga2023.ch/wp-content/uploads/2023/08/SGA2023_session-4b.pdf
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/103125
dc.identifier.wosidWOS:001234935800096
dc.information.autorucEscuela de Ingeniería; Bustos, Nicolas; S/I; 245660
dc.information.autorucEscuela de Ingeniería; Marquardt R., Carlos; 0000-0002-8571-5931; 1012334
dc.information.autorucEscuela de Ingeniería; Roquer, Tomas; S/I; 186154
dc.language.isoen
dc.nota.accesocontenido parcial
dc.relation.ispartof17° Biennial Meeting of the Society for Geology Applied to Mineral Deposits (SGA) on Mineral Resources in a Changing World: Zurich, Suiza
dc.rightsacceso restringido
dc.subject.ddc620
dc.subject.deweyIngenieríaes_ES
dc.titleRegolith-hosted rare earth genesis under humid climates in the Coastal Cordillera of the Central Andes
dc.typecomunicación de congreso
dc.volumen2
sipa.codpersvinculados245660
sipa.codpersvinculados1012334
sipa.codpersvinculados186154
sipa.trazabilidadORCID;2025-03-03
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