Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study

The Nevado-Filábride metamorphic complex (Betic Cordillera, Spain) exhibits a succession of Paleozoic and Mesozoic metasediments, orthogneisses and metabasites. The complex has been divided into three tectono-metamorphic units, from bottom to top: the Ragua, Calar-Alto and Bédar-Macael units. The pe...

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Autores: Santamaría-López, Ángel, Lanari, Pierre, Sanz de Galdeano, Carlos
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/204846
Acceso en línea:http://hdl.handle.net/10261/204846
Access Level:acceso abierto
Palabra clave:Nevado-Filábride complex
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spelling Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological studySantamaría-López, ÁngelLanari, PierreSanz de Galdeano, CarlosNevado-Filábride complexThe Nevado-Filábride metamorphic complex (Betic Cordillera, Spain) exhibits a succession of Paleozoic and Mesozoic metasediments, orthogneisses and metabasites. The complex has been divided into three tectono-metamorphic units, from bottom to top: the Ragua, Calar-Alto and Bédar-Macael units. The petrochronological evolution of the complex is not well constrained as P-T-t conditions differ between authors mainly because of the investigated rock types and the thermobarometric and geochronological techniques applied. Five garnet-bearing mica-schists from various areas of the complex were investigated for constraining and comparing the shape of the P-T paths recorded by the three units. Quantitative compositional mapping of garnet and K-white mica was combined with iterative thermodynamic models. The resulting P-T trajectories suggest that the units experienced similar clockwise P-T trajectories during Alpine metamorphism. The three units reached high-pressure and low-temperature conditions of ~2.0 GPa and ~520 °C in the Bédar-Macael unit; ~2.0–2.2 GPa and ~470–490 °C in the Calar-Alto unit; and ~2.2 GPa and ~480 °C in the Ragua unit. All samples recorded a temperature increase of ~130 °C during exhumation as shown by the successive stages of white mica re-equilibrations. Heating during exhumation was probably triggered by the hot hanging wall over the Nevado-Filábride complex. The garnet rims reflect a high-temperature and low-pressure stage which was dated at ~13 Ma using allanite U-Th-Pb geochronology (LA-ICP-MS). Following the temperature peak, exhumation continued associated to cooling. Similarities in the shapes of P-T path throughout the units suggest a continuous metamorphic sequence rather a tectonically divided complex.This study was supported by the Ministerio de Economía y Competitividad(Spain)(ProjectCGL 2012-31872), and by the project DAMAGE (AEI/FEDER CGL 201680687-R).Elsevier BVMinisterio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020192020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/204846reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.tecto.2019.06.028Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2048462026-05-22T06:33:51Z
dc.title.none.fl_str_mv Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
title Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
spellingShingle Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
Santamaría-López, Ángel
Nevado-Filábride complex
title_short Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
title_full Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
title_fullStr Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
title_full_unstemmed Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
title_sort Deciphering the tectono-metamorphic evolution of the Nevado-Filábride complex (Betic Cordillera, Spain) – A petrochronological study
dc.creator.none.fl_str_mv Santamaría-López, Ángel
Lanari, Pierre
Sanz de Galdeano, Carlos
author Santamaría-López, Ángel
author_facet Santamaría-López, Ángel
Lanari, Pierre
Sanz de Galdeano, Carlos
author_role author
author2 Lanari, Pierre
Sanz de Galdeano, Carlos
author2_role author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Nevado-Filábride complex
topic Nevado-Filábride complex
description The Nevado-Filábride metamorphic complex (Betic Cordillera, Spain) exhibits a succession of Paleozoic and Mesozoic metasediments, orthogneisses and metabasites. The complex has been divided into three tectono-metamorphic units, from bottom to top: the Ragua, Calar-Alto and Bédar-Macael units. The petrochronological evolution of the complex is not well constrained as P-T-t conditions differ between authors mainly because of the investigated rock types and the thermobarometric and geochronological techniques applied. Five garnet-bearing mica-schists from various areas of the complex were investigated for constraining and comparing the shape of the P-T paths recorded by the three units. Quantitative compositional mapping of garnet and K-white mica was combined with iterative thermodynamic models. The resulting P-T trajectories suggest that the units experienced similar clockwise P-T trajectories during Alpine metamorphism. The three units reached high-pressure and low-temperature conditions of ~2.0 GPa and ~520 °C in the Bédar-Macael unit; ~2.0–2.2 GPa and ~470–490 °C in the Calar-Alto unit; and ~2.2 GPa and ~480 °C in the Ragua unit. All samples recorded a temperature increase of ~130 °C during exhumation as shown by the successive stages of white mica re-equilibrations. Heating during exhumation was probably triggered by the hot hanging wall over the Nevado-Filábride complex. The garnet rims reflect a high-temperature and low-pressure stage which was dated at ~13 Ma using allanite U-Th-Pb geochronology (LA-ICP-MS). Following the temperature peak, exhumation continued associated to cooling. Similarities in the shapes of P-T path throughout the units suggest a continuous metamorphic sequence rather a tectonically divided complex.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/204846
url http://hdl.handle.net/10261/204846
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.tecto.2019.06.028
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
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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