Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system)
So far, the nature and evolution of the lower crust under central Spain have been constrained mainly on the basis of a heterogeneous suite of granulite xenoliths from the Spanish Central System (SCS). In recent years, ultramafic volcanics from the Calatrava Volcanic Field (CVF) have also provided de...
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| Format: | Article |
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Elsevier
2023-05-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987122001785 |
| _version_ | 1797703359301419008 |
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| author | David Orejana Carlos Villaseca Marlina A. Elburg Enrique Merino-Martínez Javier García Serrano |
| author_facet | David Orejana Carlos Villaseca Marlina A. Elburg Enrique Merino-Martínez Javier García Serrano |
| author_sort | David Orejana |
| collection | DOAJ |
| description | So far, the nature and evolution of the lower crust under central Spain have been constrained mainly on the basis of a heterogeneous suite of granulite xenoliths from the Spanish Central System (SCS). In recent years, ultramafic volcanics from the Calatrava Volcanic Field (CVF) have also provided deep-seated crustal xenoliths which have not been studied in detail. Our data, combining mineral, whole-rock and isotopic geochemistry with U–Pb–Hf isotope ratios in zircons from the CVF and SCS xenoliths, highlight the felsic composition of the lower crust under central Iberia. A number of the Calatrava xenoliths represents Variscan igneous protoliths, which are a minor population in the SCS, and were likely formed by crystallisation of intermediate and felsic melts in the lower crust during the Variscan orogeny (leucodiorite protolith age of 314 ± 3 Ma and leucogranite protolith age of 308 ± 2.5 Ma). U–Pb data of metamorphic zircons show that granulite-facies metamorphism mainly occurred from 299 to 285 Ma in both areas. These ages are slightly younger than those of granitic intrusions that could be genetically related to the granulitic residue, which points to a main role of U–Pb isotope resetting in lower crustal zircons during HT or UHT conditions. The zircon U–Pb–Hf isotopic ratios support the idea that the lower crust in central Iberia consists mainly of Ordovician–Neoproterozoic metaigneous and metasedimentary rocks associated with the Cadomian continental arc of northern Gondwana. These rocks provide evidence of mixing between juvenile magmas and an enriched crustal component, ultimately extracted from an Eburnean crust. Other more evolved components present in detrital zircons are likely related to recycling of Archean crust derived from North Africa cratonic terranes. |
| first_indexed | 2024-03-12T05:04:25Z |
| format | Article |
| id | doaj.art-0acf79476fa44b1eb79c98ab8b4190ac |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T05:04:25Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-0acf79476fa44b1eb79c98ab8b4190ac2023-09-03T09:00:03ZengElsevierGeoscience Frontiers1674-98712023-05-01143101525Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system)David Orejana0Carlos Villaseca1Marlina A. Elburg2Enrique Merino-Martínez3Javier García Serrano4Departamento de Mineralogía y Petrología, Universidad Complutense de Madrid, Spain; Corresponding author at: Department of Mineralogy and Petrology, Complutense University of Madrid, Calle José Antonio Novais 12, 28040 Madrid, Spain.Departamento de Mineralogía y Petrología, Universidad Complutense de Madrid, Spain; Departamento de Dinámica Terrestre y Observación de la Tierra, Instituto de Geociencias IGEO (UCM, CSIC), Madrid, SpainDepartment of Geology, University of Johannesburg, South AfricaInstituto Geológico y Minero de España – Consejo Superior de Investigaciones Científicas, CN IGME – CSICDepartamento de Mineralogía y Petrología, Universidad Complutense de Madrid, SpainSo far, the nature and evolution of the lower crust under central Spain have been constrained mainly on the basis of a heterogeneous suite of granulite xenoliths from the Spanish Central System (SCS). In recent years, ultramafic volcanics from the Calatrava Volcanic Field (CVF) have also provided deep-seated crustal xenoliths which have not been studied in detail. Our data, combining mineral, whole-rock and isotopic geochemistry with U–Pb–Hf isotope ratios in zircons from the CVF and SCS xenoliths, highlight the felsic composition of the lower crust under central Iberia. A number of the Calatrava xenoliths represents Variscan igneous protoliths, which are a minor population in the SCS, and were likely formed by crystallisation of intermediate and felsic melts in the lower crust during the Variscan orogeny (leucodiorite protolith age of 314 ± 3 Ma and leucogranite protolith age of 308 ± 2.5 Ma). U–Pb data of metamorphic zircons show that granulite-facies metamorphism mainly occurred from 299 to 285 Ma in both areas. These ages are slightly younger than those of granitic intrusions that could be genetically related to the granulitic residue, which points to a main role of U–Pb isotope resetting in lower crustal zircons during HT or UHT conditions. The zircon U–Pb–Hf isotopic ratios support the idea that the lower crust in central Iberia consists mainly of Ordovician–Neoproterozoic metaigneous and metasedimentary rocks associated with the Cadomian continental arc of northern Gondwana. These rocks provide evidence of mixing between juvenile magmas and an enriched crustal component, ultimately extracted from an Eburnean crust. Other more evolved components present in detrital zircons are likely related to recycling of Archean crust derived from North Africa cratonic terranes.http://www.sciencedirect.com/science/article/pii/S1674987122001785Granulite xenolithsU–Pb geochronologyLu–Hf isotopesCalatrava Volcanic FieldSpanish central system |
| spellingShingle | David Orejana Carlos Villaseca Marlina A. Elburg Enrique Merino-Martínez Javier García Serrano Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system) Geoscience Frontiers Granulite xenoliths U–Pb geochronology Lu–Hf isotopes Calatrava Volcanic Field Spanish central system |
| title | Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system) |
| title_full | Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system) |
| title_fullStr | Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system) |
| title_full_unstemmed | Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system) |
| title_short | Nature and evolution of the lower crust under central Spain: Inferences from granulite xenoliths (Calatrava Volcanic Field-Spanish central system) |
| title_sort | nature and evolution of the lower crust under central spain inferences from granulite xenoliths calatrava volcanic field spanish central system |
| topic | Granulite xenoliths U–Pb geochronology Lu–Hf isotopes Calatrava Volcanic Field Spanish central system |
| url | http://www.sciencedirect.com/science/article/pii/S1674987122001785 |
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