Magnetic mineralogy of Variscan granites from northern Portugal

Northern Portugal is characterized by the occurrence of numerous W hydrothermal deposits spatially associated with granites. The primary goal of this work is to establish a relationship between the magnetic behavior of the granites and the redox conditions during magma genesis, as this can influence...

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Autores: Cruz, Claudia, Sant'Ovaia, H., Noronha, Fernando
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:235152
Acceso en línea:https://ddd.uab.cat/record/235152
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2020.18.5
Access Level:acceso abierto
Palabra clave:Magnetic mineralogy
Variscan granites
Post-d3 biotite granites
Central iberian zone
W-mo mineralizations
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spelling Magnetic mineralogy of Variscan granites from northern Portugalan approach to their petrogenesis and metallogenic potentialCruz, ClaudiaSant'Ovaia, H.Noronha, FernandoMagnetic mineralogyVariscan granitesPost-d3 biotite granitesCentral iberian zoneW-mo mineralizationsNorthern Portugal is characterized by the occurrence of numerous W hydrothermal deposits spatially associated with granites. The primary goal of this work is to establish a relationship between the magnetic behavior of the granites and the redox conditions during magma genesis, as this can influence the occurrence of mineralizations, namely of W (Mo). To this end, the magnetic mineralogy of the granites of the Lamas de Olo Pluton, a posttectonic pluton in northern Portugal, with associated W (Mo) occurrences was characterized and compared with the magnetic mineralogy of other post-tectonic Variscan plutons. This pluton is composed of different biotite granites: Lamas de Olo, Alto dos Cabeços and Barragem. To better characterize its magnetic behavior, different analytical techniques that complement previous magnetic susceptibility studies were performed. The magnetic mineralogy of Lamas de Olo Pluton was then compared with other post-tectonic Variscan plutons such as the Vila Pouca de Aguiar, Peneda-Gerês and Lavadores-Madalena plutons. The presence of magnetite in some of these granites is important because it points to melt-oxidized conditions not commonly found in Iberian Variscan granites. Our study shows that granite areas where magnetite and/or magnetite/ilmenite coexist are important targets for W (Mo) mineralizations. The results indicate that a few plutons have granites with a complex redox history which leads to the formation of magnetite and ilmenite. 22020-01-0120202020-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/235152https://dx.doi.org/urn:doi:10.1344/GeologicaActa2020.18.5reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2351522026-06-06T12:50:31Z
dc.title.none.fl_str_mv Magnetic mineralogy of Variscan granites from northern Portugal
an approach to their petrogenesis and metallogenic potential
title Magnetic mineralogy of Variscan granites from northern Portugal
spellingShingle Magnetic mineralogy of Variscan granites from northern Portugal
Cruz, Claudia
Magnetic mineralogy
Variscan granites
Post-d3 biotite granites
Central iberian zone
W-mo mineralizations
title_short Magnetic mineralogy of Variscan granites from northern Portugal
title_full Magnetic mineralogy of Variscan granites from northern Portugal
title_fullStr Magnetic mineralogy of Variscan granites from northern Portugal
title_full_unstemmed Magnetic mineralogy of Variscan granites from northern Portugal
title_sort Magnetic mineralogy of Variscan granites from northern Portugal
dc.creator.none.fl_str_mv Cruz, Claudia
Sant'Ovaia, H.
Noronha, Fernando
author Cruz, Claudia
author_facet Cruz, Claudia
Sant'Ovaia, H.
Noronha, Fernando
author_role author
author2 Sant'Ovaia, H.
Noronha, Fernando
author2_role author
author
dc.subject.none.fl_str_mv Magnetic mineralogy
Variscan granites
Post-d3 biotite granites
Central iberian zone
W-mo mineralizations
topic Magnetic mineralogy
Variscan granites
Post-d3 biotite granites
Central iberian zone
W-mo mineralizations
description Northern Portugal is characterized by the occurrence of numerous W hydrothermal deposits spatially associated with granites. The primary goal of this work is to establish a relationship between the magnetic behavior of the granites and the redox conditions during magma genesis, as this can influence the occurrence of mineralizations, namely of W (Mo). To this end, the magnetic mineralogy of the granites of the Lamas de Olo Pluton, a posttectonic pluton in northern Portugal, with associated W (Mo) occurrences was characterized and compared with the magnetic mineralogy of other post-tectonic Variscan plutons. This pluton is composed of different biotite granites: Lamas de Olo, Alto dos Cabeços and Barragem. To better characterize its magnetic behavior, different analytical techniques that complement previous magnetic susceptibility studies were performed. The magnetic mineralogy of Lamas de Olo Pluton was then compared with other post-tectonic Variscan plutons such as the Vila Pouca de Aguiar, Peneda-Gerês and Lavadores-Madalena plutons. The presence of magnetite in some of these granites is important because it points to melt-oxidized conditions not commonly found in Iberian Variscan granites. Our study shows that granite areas where magnetite and/or magnetite/ilmenite coexist are important targets for W (Mo) mineralizations. The results indicate that a few plutons have granites with a complex redox history which leads to the formation of magnetite and ilmenite.
publishDate 2020
dc.date.none.fl_str_mv 2
2020-01-01
2020
2020-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/235152
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2020.18.5
url https://ddd.uab.cat/record/235152
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2020.18.5
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
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eu_rights_str_mv openAccess
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instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
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