P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?

Aguilar Gil, Carmen María; Liesa Torre-Marín, Montserrat; Stípská, Pavla; Schulmann, Karel; Muñoz, J. A.; Casas Tuset, Josep Maria

P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?

Structural, petrological and textural studies are combined with phase equilibria modelling of metapelites from different structural levels of the Roc de Frausa Massif in the Eastern Pyrenees. The pre‐Variscan lithological succession is divided into the Upper, Intermediate and Lower series by two ort...

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Autores:	Aguilar Gil, Carmen María, Liesa Torre-Marín, Montserrat, Stípská, Pavla, Schulmann, Karel, Muñoz, J. A., Casas Tuset, Josep Maria
Tipo de recurso:	artículo
Estado:	Versión aceptada para publicación
Fecha de publicación:	2014
País:	España
Institución:	Universidad de Barcelona
Repositorio:	Dipòsit Digital de la UB
OAI Identifier:	oai:diposit.ub.edu:2445/181638
Acceso en línea:	https://hdl.handle.net/2445/181638
Access Level:	acceso abierto
Palabra clave:	Petrologia Geologia estructural Pirineus Orientals (França) Petrology Structural geology Pyrénées-Orientales (France)

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spelling	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?Aguilar Gil, Carmen MaríaLiesa Torre-Marín, MontserratStípská, PavlaSchulmann, KarelMuñoz, J. A.Casas Tuset, Josep MariaPetrologiaGeologia estructuralPirineus Orientals (França)PetrologyStructural geologyPyrénées-Orientales (France)Structural, petrological and textural studies are combined with phase equilibria modelling of metapelites from different structural levels of the Roc de Frausa Massif in the Eastern Pyrenees. The pre‐Variscan lithological succession is divided into the Upper, Intermediate and Lower series by two orthogneiss sheets and intruded by Variscan igneous rocks. Structural analysis reveals two phases of Variscan deformation. D1 is marked by tight to isoclinal small‐scale folds and an associated flat‐lying foliation (S1) that affects the whole crustal section. D2 structures are characterized by tight upright folds facing to the NW with steep NE-SW axial planes. D2 heterogeneously reworks the D1 fabrics, leading to an almost complete transposition into a sub‐vertical foliation (S2) in the high‐grade metamorphic domain. All structures are affected by late open to tight, steeply inclined south‐verging NW-SE folds (F3) compatible with steep greenschist facies dextral shear zones of probable Alpine age. In the micaschists of the Upper series, andalusite and sillimanite grew during the formation of the S1 foliation indicating heating from 580 to 640 °C associated with an increase in pressure. Subsequent static growth of cordierite points to post‐D1 decompression. In the Intermediate series, a sillimanite-biotite-muscovite‐bearing assemblage that is parallel to the S1 fabric is statically overgrown by cordierite and K‐feldspar. This sequence points to ~1 kbar of post‐D1 decompression at 630-650 °C. The Intermediate series is intruded by a gabbro-diorite stock that has an aureole marked by widespread migmatization. In the aureole, the migmatitic S1 foliation is defined by the assemblage biotite-sillimanite-K‐feldspar-garnet. The microstructural relationships and garnet zoning are compatible with the D1 pressure peak at ~7.5 kbar and ~750 °C. Late‐ to post‐S2 cordierite growth implies that F2 folds and the associated S2 axial planar leucosomes developed during nearly isothermal decompression to 5 kbar at suprasolidus conditions. Almost complete consumption of garnet and late cordierite growth points to post‐D2 equilibration at <4 kbar and <750 °C. The early metamorphic history associated with the S1 fabric is interpreted as a result of horizontal middle crustal flow associated with progressive heating and possible burial. The upright F2 folding and S2 foliation are associated with a pressure decrease coeval with the intrusion of mafic magma at mid‐crustal levels. The D2 tectono‐metamorphic evolution may be explained by a crustal‐scale doming associated with emplacement of mafic magmas into the core of the dome.John Wiley & Sons2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/181638Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1111/jmg.12120Journal of Metamorphic Geology, 2014, vol. 33, num. 3, p. 273-294https://doi.org/10.1111/jmg.12120(c) John Wiley & Sons, 2014info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1816382026-05-27T06:46:51Z
dc.title.none.fl_str_mv	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?
title	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?
spellingShingle	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming? Aguilar Gil, Carmen María Petrologia Geologia estructural Pirineus Orientals (França) Petrology Structural geology Pyrénées-Orientales (France)
title_short	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?
title_full	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?
title_fullStr	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?
title_full_unstemmed	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?
title_sort	P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?
dc.creator.none.fl_str_mv	Aguilar Gil, Carmen María Liesa Torre-Marín, Montserrat Stípská, Pavla Schulmann, Karel Muñoz, J. A. Casas Tuset, Josep Maria
author	Aguilar Gil, Carmen María
author_facet	Aguilar Gil, Carmen María Liesa Torre-Marín, Montserrat Stípská, Pavla Schulmann, Karel Muñoz, J. A. Casas Tuset, Josep Maria
author_role	author
author2	Liesa Torre-Marín, Montserrat Stípská, Pavla Schulmann, Karel Muñoz, J. A. Casas Tuset, Josep Maria
author2_role	author author author author author
dc.subject.none.fl_str_mv	Petrologia Geologia estructural Pirineus Orientals (França) Petrology Structural geology Pyrénées-Orientales (France)
topic	Petrologia Geologia estructural Pirineus Orientals (França) Petrology Structural geology Pyrénées-Orientales (France)
description	Structural, petrological and textural studies are combined with phase equilibria modelling of metapelites from different structural levels of the Roc de Frausa Massif in the Eastern Pyrenees. The pre‐Variscan lithological succession is divided into the Upper, Intermediate and Lower series by two orthogneiss sheets and intruded by Variscan igneous rocks. Structural analysis reveals two phases of Variscan deformation. D1 is marked by tight to isoclinal small‐scale folds and an associated flat‐lying foliation (S1) that affects the whole crustal section. D2 structures are characterized by tight upright folds facing to the NW with steep NE-SW axial planes. D2 heterogeneously reworks the D1 fabrics, leading to an almost complete transposition into a sub‐vertical foliation (S2) in the high‐grade metamorphic domain. All structures are affected by late open to tight, steeply inclined south‐verging NW-SE folds (F3) compatible with steep greenschist facies dextral shear zones of probable Alpine age. In the micaschists of the Upper series, andalusite and sillimanite grew during the formation of the S1 foliation indicating heating from 580 to 640 °C associated with an increase in pressure. Subsequent static growth of cordierite points to post‐D1 decompression. In the Intermediate series, a sillimanite-biotite-muscovite‐bearing assemblage that is parallel to the S1 fabric is statically overgrown by cordierite and K‐feldspar. This sequence points to ~1 kbar of post‐D1 decompression at 630-650 °C. The Intermediate series is intruded by a gabbro-diorite stock that has an aureole marked by widespread migmatization. In the aureole, the migmatitic S1 foliation is defined by the assemblage biotite-sillimanite-K‐feldspar-garnet. The microstructural relationships and garnet zoning are compatible with the D1 pressure peak at ~7.5 kbar and ~750 °C. Late‐ to post‐S2 cordierite growth implies that F2 folds and the associated S2 axial planar leucosomes developed during nearly isothermal decompression to 5 kbar at suprasolidus conditions. Almost complete consumption of garnet and late cordierite growth points to post‐D2 equilibration at <4 kbar and <750 °C. The early metamorphic history associated with the S1 fabric is interpreted as a result of horizontal middle crustal flow associated with progressive heating and possible burial. The upright F2 folding and S2 foliation are associated with a pressure decrease coeval with the intrusion of mafic magma at mid‐crustal levels. The D2 tectono‐metamorphic evolution may be explained by a crustal‐scale doming associated with emplacement of mafic magmas into the core of the dome.
publishDate	2014
dc.date.none.fl_str_mv	2014
dc.type.none.fl_str_mv	info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion
format	article
status_str	acceptedVersion
dc.identifier.none.fl_str_mv	https://hdl.handle.net/2445/181638
url	https://hdl.handle.net/2445/181638
dc.language.none.fl_str_mv	Inglés
language_invalid_str_mv	Inglés
dc.relation.none.fl_str_mv	Versió postprint del document publicat a: https://doi.org/10.1111/jmg.12120 Journal of Metamorphic Geology, 2014, vol. 33, num. 3, p. 273-294 https://doi.org/10.1111/jmg.12120
dc.rights.none.fl_str_mv	(c) John Wiley & Sons, 2014 info:eu-repo/semantics/openAccess
rights_invalid_str_mv	(c) John Wiley & Sons, 2014
eu_rights_str_mv	openAccess
dc.format.none.fl_str_mv	application/pdf
dc.publisher.none.fl_str_mv	John Wiley & Sons
publisher.none.fl_str_mv	John Wiley & Sons
dc.source.none.fl_str_mv	Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) reponame:Dipòsit Digital de la UB instname:Universidad de Barcelona
instname_str	Universidad de Barcelona
reponame_str	Dipòsit Digital de la UB
collection	Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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P-T-t-d evolution of orogenic middle crust of the Roc de Frausa Massif (Eastern Pyrenees): a result of horizontal crustal flow and Carboniferous doming?

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