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dc.contributor.authorMoncinhatto, Thiago Ribas-
dc.contributor.authorHaag, Maurício Barcelos-
dc.contributor.authorHartmann, Gelvam André-
dc.contributor.authorSavian, Jairo Fransciso-
dc.contributor.authorPoletti, Wilbor-
dc.contributor.authorSommer, Carlos Augusto-
dc.contributor.authorCaselli, Alberto Tomás-
dc.contributor.authorFerreira da Trindade, Ricardo Iván-
dc.date.accessioned2020-05-28T12:14:44Z-
dc.date.available2020-05-28T12:14:44Z-
dc.date.issued2019-10-23-
dc.identifier.citationMoncinhatto, Thiago R., Haag, Maurício B., Hartmann, Gelvam A., Savian, Jairo F., Poletti, Wilbor y et al. (2019). Mineralogical control on the magnetic anisotropy of lavas and ignimbrites: a case study in the Caviahue-Copahue field (Argentina). Oxford University Press; Geophysical Journal International; 220 (2); 821-838es_ES
dc.identifier.issn0956-540Xes_ES
dc.identifier.issn1365-246Xes_ES
dc.identifier.urihttps://academic.oup.com/gji/article-abstract/220/2/821/5603748?redirectedFrom=fulltext-
dc.identifier.urihttps://rid.unrn.edu.ar/jspui/handle/20.500.12049/5127-
dc.description.abstractAnisotropy of magnetic susceptibility is a petrofabric tool used to estimate the alignment of minerals at the site-scale, the imbrication between the magnetic foliation and the emplacement surface being an indicator of flow direction. However, despite numerous studies examining the flow direction in pyroclastic deposits and lava flows, the effect of magnetic mineralogy and the domain state of ferromagnetic phases on the magnetic fabric remains poorly understood. This paper describes the magnetic mineralogy and its influence on the magnetic fabric of Plio-Pleistocene lava flows and ignimbrites of the Caviahue-Copahue Volcanic Complex in the Andean Southern Volcanic Zone, Argentina. Rock magnetism, anisotropy of magnetic susceptibility and anhysteretic remanent magnetization and petrographic observations were performed on 30 sites of the volcanic complex. Results revealed the extrusive and pyroclastic rocks present varied magnetic mineralogy, formed in different stages of the magmatic evolu- tion. Magnetic mineralogy variations strongly affect the anisotropy of magnetic susceptibility data in volcanic rocks and associated ignimbrites, providing ‘scattered’ fabrics when late Ti- rich titanomagnetite phases dominate the fabric, and ‘inverse’ or ‘intermediate’ fabrics when single-domain grains are present. ‘Normal’ fabrics are typically found when early crystallized pure magnetite is present. Our results highlight the complexity in the interpretation of magnetic anisotropy data in volcanic rocks and ignimbrites.es_ES
dc.format.extentp. 821–838es_ES
dc.format.mediumdigitales_ES
dc.language.isoenes_ES
dc.publisherOxford University Presses_ES
dc.titleMineralogical control on the magnetic anisotropy of lavas and ignimbrites: a case study in the Caviahue-Copahue field (Argentina)es_ES
dc.typeArticuloes_ES
dc.rights.licensehttps://creativecommons.org/licenses/by-nc-sa/4.0/es_ES
dc.description.filiationFil: Moncinhatto, Thiago R. Universidade de Sao Paulo. Instituto de Astronomia, Geofısica e Ciências Atmosféricas. São Paulo, Brazil.es_ES
dc.description.filiationFil: Haag, Maurício B. Universidade Federal do Rio Grande do Sul. Instituto de Geociências. Porto Alegre, Brazil.es_ES
dc.description.filiationFil: Hartmann, Gelvam A. Universidade Estadual de Campinas. Instituto de Geociências.Campinas. Brazil.es_ES
dc.description.filiationFil: Savian, Jairo F. Universidade Federal do Rio Grande do Sul. Instituto de Geociências. Porto Alegre, Brazil.es_ES
dc.description.filiationFil: Poletti, Wilbor. Universidade Federal dos Vales do Jequitinhonha e Mucuri. Instituto de Ciência e Tecnologia. Diamantina, Brazil.es_ES
dc.description.filiationFil: Sommer, Carlos A. Universidade Federal do Rio Grande do Sul. Instituto de Geociências. Porto Alegre, Brazil.es_ES
dc.description.filiationFil: Caselli, Alberto Tomás Universidad Nacional de Río Negro. Laboratorio de Estudio y Seguimiento de Volcanes Activos. Río Negro, Argentina.es_ES
dc.description.filiationFil: Trindade, Ricardo I. Universidade de Sao Paulo. Instituto de Astronomia, Geofısica e Ciências Atmosféricas. São Paulo, Brazil.es_ES
dc.subject.keywordAMSes_ES
dc.subject.keywordAARMes_ES
dc.subject.keywordMagnetic Mineralogyes_ES
dc.subject.keywordCaviahue-Copahue Volcanic Complexes_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.origin.lugarDesarrolloUniversidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.relation.journalissue220 (2)es_ES
dc.description.reviewtruees_ES
dc.description.resumenAnisotropy of magnetic susceptibility is a petrofabric tool used to estimate the alignment of minerals at the site-scale, the imbrication between the magnetic foliation and the emplacement surface being an indicator of flow direction. However, despite numerous studies examining the flow direction in pyroclastic deposits and lava flows, the effect of magnetic mineralogy and the domain state of ferromagnetic phases on the magnetic fabric remains poorly understood. This paper describes the magnetic mineralogy and its influence on the magnetic fabric of Plio-Pleistocene lava flows and ignimbrites of the Caviahue-Copahue Volcanic Complex in the Andean Southern Volcanic Zone, Argentina. Rock magnetism, anisotropy of magnetic susceptibility and anhysteretic remanent magnetization and petrographic observations were performed on 30 sites of the volcanic complex. Results revealed the extrusive and pyroclastic rocks present varied magnetic mineralogy, formed in different stages of the magmatic evolu- tion. Magnetic mineralogy variations strongly affect the anisotropy of magnetic susceptibility data in volcanic rocks and associated ignimbrites, providing ‘scattered’ fabrics when late Ti- rich titanomagnetite phases dominate the fabric, and ‘inverse’ or ‘intermediate’ fabrics when single-domain grains are present. ‘Normal’ fabrics are typically found when early crystallized pure magnetite is present. Our results highlight the complexity in the interpretation of magnetic anisotropy data in volcanic rocks and ignimbrites.es_ES
dc.identifier.doihttps://doi.org/10.1093/gji/ggz483-
dc.relation.journalTitleGeophysical Journal Internationales_ES
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