The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana

In the Ossa Morena Domain of SW Iberia, the Calzadilla Ophiolite is formed by an ensemble of ultramafic and mafic rocks that seem to represent a fragment of an oceanic Moho transition zone. The ophiolite consists of a main sheet with a minimum thickness of c. 1000 m and several ultramafic slices tha...

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Authors: Arenas, Ricardo, Fernández-Suárez, Javier, Montero, Pilar, Díez Fernández, Rubén, Andonaegui, P., Sánchez Martínez, Sonia, Albert, Richard, Fuenlabrada, J.M., Matas, Jerónimo, Martín Parra, L.M., Rubio Pascual, Francisco Javier, Jiménez Díaz, Alberto, Pereira, M. Francisco
Format: article
Status:Versión aceptada para publicación
Publication Date:2018
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/186586
Online Access:http://hdl.handle.net/10261/186586
Access Level:Open access
Keyword:Ediacaran ophiolite
Boninites
Gondwanan fore-arc
SW Iberian Massif
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spelling The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of GondwanaArenas, RicardoFernández-Suárez, JavierMontero, PilarDíez Fernández, RubénAndonaegui, P.Sánchez Martínez, SoniaAlbert, RichardFuenlabrada, J.M.Matas, JerónimoMartín Parra, L.M.Rubio Pascual, Francisco JavierJiménez Díaz, AlbertoPereira, M. FranciscoEdiacaran ophioliteBoninitesGondwanan fore-arcSW Iberian MassifIn the Ossa Morena Domain of SW Iberia, the Calzadilla Ophiolite is formed by an ensemble of ultramafic and mafic rocks that seem to represent a fragment of an oceanic Moho transition zone. The ophiolite consists of a main sheet with a minimum thickness of c. 1000 m and several ultramafic slices that appear imbricated with Ediacaran siliciclastic rocks of the so called Serie Negra. The mafic rocks of the Calzadilla Ophiolite show an extreme depletion in some HFSE such as Nb, Zr, Th, Hf and Ta, low TiO2 contents and high MgO, which allow identifying them as magmatic types of boninitic affinity, such as those frequently associated with fore-arc settings. U-Pb zircon dating of the gabbroic rocks suggests that the igneous protoliths crystallised at c. 600 Ma and were extracted directly from the mantle, according to the juvenile isotopic sources revealed by the Hf isotopic composition of the dated zircons. At c. 540 Ma the U-Pb isotopic system was affected by a partial resetting event with moderate generation of new zircon. According to these data, it is considered that the Calzadilla Ophiolite was formed in a supra-subduction zone setting, very likely in a fore-arc domain, during a roll-back episode affecting the peri-Gondwanan subductive slab. The fore-arc domain was probably proximal to the West Africa Craton. It is very likely that the ductile deformation, metamorphism and tectonic imbrication of the Calzadilla Ophiolite and the Serie Negra occurred at c. 540 Ma, during an increase in the subduction rate and a significant decrease of the subduction angle of the oceanic slab. The information provided by the Calzadilla Ophiolite allows to better constrain the geodynamic evolution of the African margin of Gondwana.Financial support has been provided by the Spanish project CGL2016-76438-P (Ministerio de Economía, Industria y Competitividad).Peer reviewedElsevierMinisterio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201920192018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://hdl.handle.net/10261/186586reponame: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/CGL2016-76438-Phttps://doi.org/10.1016/j.gr.2018.01.015Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1865862026-05-22T06:33:51Z
dc.title.none.fl_str_mv The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
title The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
spellingShingle The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
Arenas, Ricardo
Ediacaran ophiolite
Boninites
Gondwanan fore-arc
SW Iberian Massif
title_short The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
title_full The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
title_fullStr The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
title_full_unstemmed The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
title_sort The Calzadilla Ophiolite (SW Iberia) and the Ediacaran fore-arc evolution of the African margin of Gondwana
dc.creator.none.fl_str_mv Arenas, Ricardo
Fernández-Suárez, Javier
Montero, Pilar
Díez Fernández, Rubén
Andonaegui, P.
Sánchez Martínez, Sonia
Albert, Richard
Fuenlabrada, J.M.
Matas, Jerónimo
Martín Parra, L.M.
Rubio Pascual, Francisco Javier
Jiménez Díaz, Alberto
Pereira, M. Francisco
author Arenas, Ricardo
author_facet Arenas, Ricardo
Fernández-Suárez, Javier
Montero, Pilar
Díez Fernández, Rubén
Andonaegui, P.
Sánchez Martínez, Sonia
Albert, Richard
Fuenlabrada, J.M.
Matas, Jerónimo
Martín Parra, L.M.
Rubio Pascual, Francisco Javier
Jiménez Díaz, Alberto
Pereira, M. Francisco
author_role author
author2 Fernández-Suárez, Javier
Montero, Pilar
Díez Fernández, Rubén
Andonaegui, P.
Sánchez Martínez, Sonia
Albert, Richard
Fuenlabrada, J.M.
Matas, Jerónimo
Martín Parra, L.M.
Rubio Pascual, Francisco Javier
Jiménez Díaz, Alberto
Pereira, M. Francisco
author2_role author
author
author
author
author
author
author
author
author
author
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 Ediacaran ophiolite
Boninites
Gondwanan fore-arc
SW Iberian Massif
topic Ediacaran ophiolite
Boninites
Gondwanan fore-arc
SW Iberian Massif
description In the Ossa Morena Domain of SW Iberia, the Calzadilla Ophiolite is formed by an ensemble of ultramafic and mafic rocks that seem to represent a fragment of an oceanic Moho transition zone. The ophiolite consists of a main sheet with a minimum thickness of c. 1000 m and several ultramafic slices that appear imbricated with Ediacaran siliciclastic rocks of the so called Serie Negra. The mafic rocks of the Calzadilla Ophiolite show an extreme depletion in some HFSE such as Nb, Zr, Th, Hf and Ta, low TiO2 contents and high MgO, which allow identifying them as magmatic types of boninitic affinity, such as those frequently associated with fore-arc settings. U-Pb zircon dating of the gabbroic rocks suggests that the igneous protoliths crystallised at c. 600 Ma and were extracted directly from the mantle, according to the juvenile isotopic sources revealed by the Hf isotopic composition of the dated zircons. At c. 540 Ma the U-Pb isotopic system was affected by a partial resetting event with moderate generation of new zircon. According to these data, it is considered that the Calzadilla Ophiolite was formed in a supra-subduction zone setting, very likely in a fore-arc domain, during a roll-back episode affecting the peri-Gondwanan subductive slab. The fore-arc domain was probably proximal to the West Africa Craton. It is very likely that the ductile deformation, metamorphism and tectonic imbrication of the Calzadilla Ophiolite and the Serie Negra occurred at c. 540 Ma, during an increase in the subduction rate and a significant decrease of the subduction angle of the oceanic slab. The information provided by the Calzadilla Ophiolite allows to better constrain the geodynamic evolution of the African margin of Gondwana.
publishDate 2018
dc.date.none.fl_str_mv 2018
2019
2019
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/10261/186586
url http://hdl.handle.net/10261/186586
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/CGL2016-76438-P
https://doi.org/10.1016/j.gr.2018.01.015
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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