Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma

Magnetic susceptibility (MS) has been measured in Variscan granites from central Spain. They yield values in the order of 15 to 180µSI units for S- and I-type granites, indicating that both types belong to the ilmenite series. Only samples from magnetite-bearing leucogranites from the I-type La Pedr...

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Autores: Villaseca, Carlos, Ruiz-Martínez, V. C., Pérez-Soba, C.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/185308
Acesso em linha:http://hdl.handle.net/10261/185308
Access Level:acceso abierto
Palavra-chave:Magnetic susceptibility
Granite type
Biotite chemistry
Oxygen fugacity
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spelling Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magmaVillaseca, CarlosRuiz-Martínez, V. C.Pérez-Soba, C.Magnetic susceptibilityGranite typeBiotite chemistryOxygen fugacityMagnetic susceptibility (MS) has been measured in Variscan granites from central Spain. They yield values in the order of 15 to 180µSI units for S- and I-type granites, indicating that both types belong to the ilmenite series. Only samples from magnetite-bearing leucogranites from the I-type La Pedriza massif show high MS values, in the order of 500-1400µSI, reflecting the presence of this ferromagnetic mineral. Mineral chemistry of magmatic Fe-rich minerals (mainly biotite) suggests similar oxidation values for both granite types. MS values change in highly fractionated granites accordingly either with the presence of rare new Fe-oxide phases (some I-type leucogranites) or with the marked modal amount decrease of Fe-rich minerals (I- and S-type leucogranites). The redox state in highly fractionated granite melts is mostly controlled by magmatic processes that modify redox conditions inherited from the source region. Thus, the occurrence of magnetite or ilmenite in granites is primarily controlled by the oxidation state of the source material but also by the differentiation degree of the granite melt. The presence of magnetite in some Variscan I-type leucogranites might be a consequence of crystal fractionation processes in a more limited mafic mineral assemblage than in S-type granite melts.This work is included in the objectives and supported by the CGL2016- 78796 project of the Spanish MICINN and the Santander- UCM PR26/16-20294 project.Peer reviewedUniversidad de BarcelonaMinisterio de Economía y Competitividad (España)Banco SantanderUniversidad Complutense de MadridConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201920192017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/185308reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2016-78796http://dx.doi.org/10.1344/GeologicaActa2017.15.4.8Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1853082026-05-22T06:33:51Z
dc.title.none.fl_str_mv Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
title Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
spellingShingle Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
Villaseca, Carlos
Magnetic susceptibility
Granite type
Biotite chemistry
Oxygen fugacity
title_short Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
title_full Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
title_fullStr Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
title_full_unstemmed Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
title_sort Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma
dc.creator.none.fl_str_mv Villaseca, Carlos
Ruiz-Martínez, V. C.
Pérez-Soba, C.
author Villaseca, Carlos
author_facet Villaseca, Carlos
Ruiz-Martínez, V. C.
Pérez-Soba, C.
author_role author
author2 Ruiz-Martínez, V. C.
Pérez-Soba, C.
author2_role author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Banco Santander
Universidad Complutense de Madrid
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Magnetic susceptibility
Granite type
Biotite chemistry
Oxygen fugacity
topic Magnetic susceptibility
Granite type
Biotite chemistry
Oxygen fugacity
description Magnetic susceptibility (MS) has been measured in Variscan granites from central Spain. They yield values in the order of 15 to 180µSI units for S- and I-type granites, indicating that both types belong to the ilmenite series. Only samples from magnetite-bearing leucogranites from the I-type La Pedriza massif show high MS values, in the order of 500-1400µSI, reflecting the presence of this ferromagnetic mineral. Mineral chemistry of magmatic Fe-rich minerals (mainly biotite) suggests similar oxidation values for both granite types. MS values change in highly fractionated granites accordingly either with the presence of rare new Fe-oxide phases (some I-type leucogranites) or with the marked modal amount decrease of Fe-rich minerals (I- and S-type leucogranites). The redox state in highly fractionated granite melts is mostly controlled by magmatic processes that modify redox conditions inherited from the source region. Thus, the occurrence of magnetite or ilmenite in granites is primarily controlled by the oxidation state of the source material but also by the differentiation degree of the granite melt. The presence of magnetite in some Variscan I-type leucogranites might be a consequence of crystal fractionation processes in a more limited mafic mineral assemblage than in S-type granite melts.
publishDate 2017
dc.date.none.fl_str_mv 2017
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/185308
url http://hdl.handle.net/10261/185308
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2016-78796
http://dx.doi.org/10.1344/GeologicaActa2017.15.4.8
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidad de Barcelona
publisher.none.fl_str_mv Universidad de Barcelona
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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