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Título: | Cadomia origins: paired Ediacaran ophiolites from the Iberian Massif, the opening and closure record of peri-Gondwanan basins |
Autor: | Arenas, Ricardo CSIC ORCID ; Vérard, Christian; Albert, Richard; Rojo-Pérez, E; Sánchez Martínez, Sonia; Novo Fernández, Irene; Moreno Martín, Diana; Gerdes, Axel; García-Casco, Antoni; Díez Fernández, Rubén | Fecha de publicación: | 23-abr-2024 | Editor: | Geological Society of London | Citación: | Geological Society of London - Special Publications 542(1): 507-526 (2024) | Resumen: | [EN] The recent discovery of Ediacaran ophiolites in the SW Iberian Massif has made it possible to pinpoint the evolution of the Cadomian basement of Europe. The Calzadilla and Mérida ophiolites (gabbroic protoliths dated at c. 600 and 594 Ma, respectively) have geochemical characteristics typical of supra-subduction zone ophiolites. They are interpreted as originating during the initial opening of a forearc basin with boninitic magmatism (Calzadilla), followed by the formation of a back-arc basin with arc-tholeiites (Mérida). Widening of the back-arc led to the rifting and drifting of a section of the active continental margin (Cadomia). Closure of these oceanic domains initiated rapid contraction, culminating in the collision of Cadomia with Gondwana (c. 590–540 Ma). The application of a PANALESIS model to this palaeogeographic setting confirms the plausibility of Cadomian rifting and the likely opening of broad oceanic domains. It also confirms the final collision of Cadomia with Gondwana, although the synthetic and regional data disagree in the precise chronology of the convergence and collision of Cadomia with the West Africa Craton. This work shows that the evolution of the Cadomian basement is much more complex than traditionally considered. | Descripción: | Está incluido en el especial "Supercontinents, orogenesis and magmatism". | Versión del editor: | https://doi.org/10.1144/sp542-2022-328 | URI: | http://hdl.handle.net/10261/355475 | DOI: | 10.1144/sp542-2022-328 | ISSN: | 0305-8719 | E-ISSN: | 2041-4927 |
Aparece en las colecciones: | (IGME) Artículos (IGEO) Artículos (IACT) Artículos |
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Cadomia _origins_paired_2024.pdf | Preprint | 4,51 MB | Adobe PDF | Visualizar/Abrir |
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