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DC Field | Value | Language |
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dc.contributor.author | Pujol Solà, Núria | - |
dc.contributor.author | Casas Tuset, Josep Maria | - |
dc.contributor.author | Proenza Fernández, Joaquín Antonio | - |
dc.contributor.author | Blanco-Quintero, Idael Francisco | - |
dc.contributor.author | Druguet, Elena | - |
dc.contributor.author | Liesa Torre-Marín, Montserrat | - |
dc.contributor.author | Roman-Alpiste, Manuel Jesús | - |
dc.contributor.author | Álvaro, José Javier | - |
dc.date.accessioned | 2022-12-22T11:39:43Z | - |
dc.date.available | 2022-12-22T11:39:43Z | - |
dc.date.issued | 2022 | - |
dc.identifier.issn | 1695-6133 | - |
dc.identifier.uri | http://hdl.handle.net/2445/191734 | - |
dc.description.abstract | This study presents a new geochemical, petrological, and geochronological U-Pb dataset from Ediacaran metabasites of the Canigó and Cap de Creus massifs, Eastern Pyrenees. The rocks are composed of calcic amphibole + plagioclase + chlorite + epidote ± quartz plus titanite + apatite + ilmenite ± biotite ± rutile as accessory phases and show relict igneous textures. Peak pressure-temperature determinations share common conditions, ranging 452-482ºC and 5.2-7.7kbar. These intermediate P-T conditions suggest Barrovian-type metamorphism, most likely related to a collisional setting. The metabasites correspond to evolved basaltic rocks (Mg#<0.55) with moderate TiO2 content (up to 2.08wt.%) and relatively low Cr (43-416ppm). The rocks are moderately enriched in light rare earth elements (LREE) relative to heavy rare earth elements (HREE) (average (La/Lu)n of 2.7) and the N-MORB normalized multi-element patterns show negative slopes, with prominent negative Nb anomalies ((Nb/La)NMORB=0.33-0.78). These variations are akin to island arc tholeiites generated in back-arc basins and to other metabasites described in the Eastern Pyrenees with a putative Ediacaran age, and they differ from the Ordovician tholeiitic metabasites from the Canigó massif, which derived from a contaminated E-MORB source. The positive ƐNd(T) values (0.82-3.05) of the studied metabasites preclude a notable contribution from an older continental crust. U-Pb dating (LA-ICP-MS) of one chlorite-rich schist sample in contact with the metabasites from the Canigó massif yielded a main peak at ca. 632Ma. We argue that the Cadomian metabasites from the Pyrenees formed during back-arc extension in the continental margin of Gondwana and were later affected by (probably early Variscan) medium-P metamorphism before the HT-LP metamorphism classically described in the Pyrenees. | - |
dc.format.extent | 30 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | (UB). (ICTJA). (IDEA). (UAB). (CSIC) | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1344/GeologicaActa2022.20.17 | - |
dc.relation.ispartof | Geologica Acta, 2022, vol. 20, p. 1-26 | - |
dc.relation.uri | https://doi.org/10.1344/GeologicaActa2022.20.17 | - |
dc.rights | cc-by-sa (c) Pujol Solà, Núria et al., 2022 | - |
dc.rights.uri | https://creativecommons.org/licenses/by-sa/4.0/ | - |
dc.source | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) | - |
dc.subject.classification | Geoquímica | - |
dc.subject.classification | Geocronologia | - |
dc.subject.classification | Petrologia | - |
dc.subject.classification | Pirineus | - |
dc.subject.other | Geochemistry | - |
dc.subject.other | Geochronology | - |
dc.subject.other | Petrology | - |
dc.subject.other | Pyrenees | - |
dc.title | Cadomian metabasites of the Eastern Pyrenees revisited | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 727554 | - |
dc.date.updated | 2022-12-22T11:39:43Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) |
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File | Description | Size | Format | |
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727554.pdf | 7.71 MB | Adobe PDF | View/Open |
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