Upper crustal differentiation processes and their role in 238U-230Th disequilibria at the San Pedro-Linzor volcanic chain (Central Andes)

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datacite.alternateIdentifier.citationJournal of South American Earth Sciences, 102, 2020
datacite.alternateIdentifier.doi10.1016/j.jsames.2020.102672
datacite.alternateIdentifier.issn0895-9811
datacite.creatorGodoy, Benigno E.
datacite.creatorMcGee, Lucy Emma
datacite.creatorGonzález-Maurel, Osvaldo
datacite.creatorRodríguez, Inés
datacite.creatorLe Roux, Petrus J.
datacite.creatorMorata, Diego
datacite.creatorMenzies, Andrew H.
datacite.date2020
datacite.rightsRegistro bibliográfico
datacite.subject238u Excess
datacite.subjectAmphibole Fractionation
datacite.subjectSan Pedro Linzor Volcanic Chain
datacite.subjectSubduction Zone Magmatism
datacite.subjectU-series Disequilibria
datacite.subjectDifferentiation
datacite.subjectDisequilibrium
datacite.subjectLava
datacite.subjectMagmatism
datacite.subjectStratovolcano
datacite.subjectThorium Isotope
datacite.subjectTrace Element
datacite.subjectUpper Crust
datacite.subjectAndes
datacite.subjectAntofagasta
datacite.subjectChile
datacite.subjectLinzor
datacite.subjectSan Pedro Volcano
datacite.titleUpper crustal differentiation processes and their role in 238U-230Th disequilibria at the San Pedro-Linzor volcanic chain (Central Andes)
dc.contributor.authorRODRIGUEZ ARANEDA, INES MARIA
dc.description.abstractU-series data are combined with major and trace element constraints to construct a detailed view of the magmatic system feeding the San Pedro-Linzor volcanic chain, aiding the understanding of how stratovolcanoes in extremely thick arc crust evolve. Lavas from the Quaternary San Pedro-Linzor volcanic chain (Central Andes) have (238U/230Th) ranging from 1.015 to 1.072, with 238U excess even in the less evolved (~57 wt% SiO<inf>2</inf>) analyzed lavas. Contrary to well-established trends between fluid mobile elements and 238U excess, (238U/230Th)<inf>0</inf> shows no systematic correlation with ratios indicative of fluid-driven melting (e.g. Ba/Hf and K/La). Moreover, the inverse correlation between (238U/232Th) with the amount of slab-derived fluid and the oxidation state of the mantle below Central Andes, which decreases eastwards, suggests that the main control of the 238U excess is not associated with hydration of the mantle wedge. Changes in (238U/232Th) and (230Th/232Th)<inf>0</inf> are observed with variations in SiO<inf>2</inf> and CaO + Al<inf>2</inf>O<inf>3</inf> contents, and 87Sr/86Sr and Dy/Dy* ratios of the lavas. These changes correspond to increasing (238U/232Th) with decreasing Dy/Dy* and CaO + Al<inf>2</inf>O<inf>3</inf> ratios, which is attributed to changes in crystallization of mineralogical phases within magmatic chambers during differentiation. Also, 230Th in-growth is produced during stagnation within magmatic chambers located below the San Pedro-Linzor volcanic chain. Finally, a positive correlation between (230Th/232Th)<inf>0</inf> and 87Sr/86Sr indicates an important role of crustal contamination, and of new mafic inputs during evolution of the volcanic chain with time. Our observations suggest that better constraints of all magmatic processes are needed to fully understand the U-series disequilibria recognized for the different volcanic structures developed within subduction-related tectonic environments. © 2020 Elsevier B.V., All rights reserved.
dc.description.ia_keywordvolcanic, chain, magmatic, pedro, linzor, lavas, central
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/4019
dc.language.isoen
dc.publisherElsevier BV
dc.relationinstname: ANID
dc.relationreponame: Repositorio Digital RI2.0
dc.rights.driverinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.sourceJournal of South American Earth Sciences
dc.subject.ia_oecd1nIngeniería y Tecnología
dc.subject.ia_oecd2nIngeniería Mecánica
dc.subject.ia_oecd3nIngeniería Mecánica
dc.type.driverinfo:eu-repo/semantics/article
dc.type.driverhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.type.openaireinfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
oaire.citationEdition2020
oaire.citationTitleJournal of South American Earth Sciences
oaire.citationVolume102
oaire.fundingReferenceCONICYT ANID FONDECYT 3160432 (Postdoctorado)
oaire.fundingReferenceCONICYT Beca Doctorado Nacional 21150403
oaire.fundingReferenceCONICYT ANID FONDAP 15090013
oaire.licenseConditionCopyright © Elsevier Ltd, 2020
oaire.resourceTypeArtículo
oaire.resourceType.enArticle
relation.isAuthorOfPublicatione44035a3-7fcd-4680-9741-5de2f7ab8255
relation.isAuthorOfPublication.latestForDiscoverye44035a3-7fcd-4680-9741-5de2f7ab8255
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uct.comunidadIngenieríaen_US
uct.departamentoDepartamento de Obras Civiles y Geología
uct.facultadFacultad de Ingeniería
uct.indizacionScience Citation Index Expanded - SCIE
uct.indizacionScopus
uct.indizacionGeoRef
uct.indizacionChemical Abstracts Service (CAS)
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