P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif)
[EN] In the Cabo Ortegal Complex (NW Iberian Massif), a 20 km long and 700 m thick layer of eclogites constitutes one of the world's largest outcrops of this type of rocks. It belongs to the Upper Allochthon, a terrane that represents the remnants of a Cambrian peri-Gondwanan fore-arc basin tha...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/380712 |
| Acceso en línea: | http://hdl.handle.net/10261/380712 https://api.elsevier.com/content/abstract/scopus_id/85216376850 |
| Access Level: | acceso abierto |
| Palabra clave: | Variscan orogeny Cabo ortegal complex Eclogites LA-ICP-MS Thermodynamic modelling U[sbnd]Pb |
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P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif)Novo Fernández, IreneAlbert, RichardArenas, RicardoGil Ibarguchi, J. I.Sánchez Martínez, SoniaGerdes, AxelDíez Fernández, RubénBeranoaguirre de Miguel, AratzGarcía-Casco, AntonioVariscan orogenyCabo ortegal complexEclogitesLA-ICP-MSThermodynamic modellingU[sbnd]Pb[EN] In the Cabo Ortegal Complex (NW Iberian Massif), a 20 km long and 700 m thick layer of eclogites constitutes one of the world's largest outcrops of this type of rocks. It belongs to the Upper Allochthon, a terrane that represents the remnants of a Cambrian peri-Gondwanan fore-arc basin that was involved in the Variscan collision. In this layer, three types of eclogites are differentiated according to their mineralogy and bulk composition: the common, the ferrotitaniferous, and the Al-Mg-rich eclogites. This work studies the three types of eclogites via thermodynamic modelling. The ferric content of the bulk composition during the metamorphic peak is analyzed, the results demonstrating a strong influence on the metamorphic paragenesis in two of the three types. Isochemical equilibrium phase diagrams in the MnNCKFMASTHO system indicate metamorphic peak conditions of c. 23–25 kbar at c. 750–800 °C prior to a decompression up to c. 16–20 kbar. U[sbnd]Pb dating in zircon crystals (LA-ICP-MS) from an eclogite yields an age of c. 390 Ma for the high-P metamorphism. All this indicates deep subduction of the peri-Gondwanan realm at the onset of the Variscan Orogeny during Early Devonian. The results are used to discuss the stacking of units that constitute the Upper Allochthon and envisage the processes that contributed to their exhumation.This work was supported by the MCIN/AEI under the Spanish projects PID2020-112489-GB-C21 and PID2020-112489-GB-C22. I. Novo-Fernández is thankful to the Spanish Ministry of Sciences, Innovation and Universities which provided her with a ‘Margarita Salas’ postdoctoral contract funded by the European Union-NextGenerationEU and a ‘Juan de la Cierva’ postdoctoral contract (ref.: JDC2022-049113-I).Peer reviewedElsevierAgencia Estatal de Investigación (España)Ministerio de Ciencia, Innovación y Universidades (España)European CommissionDíez Fernández, Rubén [0000-0002-0379-7970]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Preprintinfo:eu-repo/semantics/submittedVersionapplication/pdfhttp://hdl.handle.net/10261/380712https://api.elsevier.com/content/abstract/scopus_id/85216376850reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI//PID2020-112489-GB-C21info:eu-repo/grantAgreement/AEI//PID2020-112489-GB-C22.1info:eu-repo/grantAgreement///JJDC2022-049113-Ihttps://doi.org/10.1016/j.lithos.2025.107952Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3807122026-05-22T06:33:51Z |
| dc.title.none.fl_str_mv |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) |
| title |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) |
| spellingShingle |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) Novo Fernández, Irene Variscan orogeny Cabo ortegal complex Eclogites LA-ICP-MS Thermodynamic modelling U[sbnd]Pb |
| title_short |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) |
| title_full |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) |
| title_fullStr |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) |
| title_full_unstemmed |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) |
| title_sort |
P-T evolution and refined U[sbnd]Pb geochronology of the giant eclogite layer of the Cabo Ortegal Complex (NW Iberian Massif) |
| dc.creator.none.fl_str_mv |
Novo Fernández, Irene Albert, Richard Arenas, Ricardo Gil Ibarguchi, J. I. Sánchez Martínez, Sonia Gerdes, Axel Díez Fernández, Rubén Beranoaguirre de Miguel, Aratz García-Casco, Antonio |
| author |
Novo Fernández, Irene |
| author_facet |
Novo Fernández, Irene Albert, Richard Arenas, Ricardo Gil Ibarguchi, J. I. Sánchez Martínez, Sonia Gerdes, Axel Díez Fernández, Rubén Beranoaguirre de Miguel, Aratz García-Casco, Antonio |
| author_role |
author |
| author2 |
Albert, Richard Arenas, Ricardo Gil Ibarguchi, J. I. Sánchez Martínez, Sonia Gerdes, Axel Díez Fernández, Rubén Beranoaguirre de Miguel, Aratz García-Casco, Antonio |
| author2_role |
author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Agencia Estatal de Investigación (España) Ministerio de Ciencia, Innovación y Universidades (España) European Commission Díez Fernández, Rubén [0000-0002-0379-7970] Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Variscan orogeny Cabo ortegal complex Eclogites LA-ICP-MS Thermodynamic modelling U[sbnd]Pb |
| topic |
Variscan orogeny Cabo ortegal complex Eclogites LA-ICP-MS Thermodynamic modelling U[sbnd]Pb |
| description |
[EN] In the Cabo Ortegal Complex (NW Iberian Massif), a 20 km long and 700 m thick layer of eclogites constitutes one of the world's largest outcrops of this type of rocks. It belongs to the Upper Allochthon, a terrane that represents the remnants of a Cambrian peri-Gondwanan fore-arc basin that was involved in the Variscan collision. In this layer, three types of eclogites are differentiated according to their mineralogy and bulk composition: the common, the ferrotitaniferous, and the Al-Mg-rich eclogites. This work studies the three types of eclogites via thermodynamic modelling. The ferric content of the bulk composition during the metamorphic peak is analyzed, the results demonstrating a strong influence on the metamorphic paragenesis in two of the three types. Isochemical equilibrium phase diagrams in the MnNCKFMASTHO system indicate metamorphic peak conditions of c. 23–25 kbar at c. 750–800 °C prior to a decompression up to c. 16–20 kbar. U[sbnd]Pb dating in zircon crystals (LA-ICP-MS) from an eclogite yields an age of c. 390 Ma for the high-P metamorphism. All this indicates deep subduction of the peri-Gondwanan realm at the onset of the Variscan Orogeny during Early Devonian. The results are used to discuss the stacking of units that constitute the Upper Allochthon and envisage the processes that contributed to their exhumation. |
| publishDate |
2025 |
| dc.date.none.fl_str_mv |
2025 2025 2025 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Preprint info:eu-repo/semantics/submittedVersion |
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article |
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submittedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/380712 https://api.elsevier.com/content/abstract/scopus_id/85216376850 |
| url |
http://hdl.handle.net/10261/380712 https://api.elsevier.com/content/abstract/scopus_id/85216376850 |
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Inglés |
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Inglés |
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#PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI//PID2020-112489-GB-C21 info:eu-repo/grantAgreement/AEI//PID2020-112489-GB-C22.1 info:eu-repo/grantAgreement///JJDC2022-049113-I https://doi.org/10.1016/j.lithos.2025.107952 Sí |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Elsevier |
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Elsevier |
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