2026-06-28T20:29:23Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1178162025-09-18T14:34:01Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Novo Fernández, Irene author Pujol Solà, Núria author Arenas Martín, Ricardo author Díez Fernández, Rubén author Proenza Fernández, Joaquin Antonio author Rojo Pérez, Esther author Cambeses, A. author Sánchez Martínez, Sonia author Iglesias Ruiz, Gabriel author Garcia Casco, Antonio 2025-02-04T19:09:18Z 2025-02-04T19:09:18Z 2024 Novo-Fernández, I., Pujol-Solà, N., Arenas, R., Díez Fernández, R., Proenza, J. A., Rojo-Pérez, E., Cambeses, A., Sánchez Martínez, S., Iglesias, G., & Garcia-Casco, A. (2025). From onset of Cadomian subduction to forearc-arc-continent collision: Insights from the Neoproterozoic Calzadilla Metaophiolite (Sw iberia). International Geology Review, 67(3), 257-284 0020-6814 10.1080/00206814.2024.2389566 https://hdl.handle.net/20.500.14352/117816 1938-2839 https://doi.org/10.1080/00206814.2024.2389566 https://www.tandfonline.com/doi/full/10.1080/00206814.2024.2389566?af=R The Cadomian basement of SW Iberian Massif appears in the so-called Ossa-Morena Complex, which contains several allochthonous terranes that are key for deciphering the evolution of the Gondwana margin during the Neoproterozoic. In this context, the Calzadilla Ophiolite represents the remnants of an oceanic Ediacaran lithosphere formed by a boninitic mafic crust that overlies a serpentinized ultramafic section, the latter being the biggest outcrop of Cadomian serpentinites in Europe. In this work, the petrological and geochemical nature of the mantle section is analysed, as well as the tectonothermal evolution of both, the mafic crust and the ultramafic section. The algebraic analysis of whole rock geochemistry of the serpentinites indicates that the protolith corresponds to harzburgite. The geochemical fingerprint of the serpentinites, as well as the primary spinel crystals composition, shows that peridotites underwent high degrees of partial melting (up to 16%) in a forearc setting. Thermodynamic modelling and average PT methods were applied to serpentinites and mafic dykes from the ultramafic section as well as to amphibolites from the mafic section, both of which experienced progradation up to 4–5 kbar and 525–575°C. According to the data, the protoliths of the Calzadilla Ophiolite were formed in a peri-Gondwanan arc system developed during the subduction of oceanic crust below Gondwana. The roll-back of the subducting slab would induce the opening of the forearc basin at c. 602 Ma, protolith age of amphibolites from crustal section, with an extensive partial melting of the mantle wedge and the formation of boninitic-affinity magmas that constitute the mafic section of the Calzadilla Ophiolite. Metasomatism and serpentinization of the mantle wedge would occur via melt- and fluid–rock interactions. A compression-dominated stage at c. 540 led to the emplacement of the Calzadilla Ophiolite onto the Cadomian magmatic arc, with the development of the amphibolite-facies metamorphic imprint. eng From onset of Cadomian subduction to forearc-arc-continent collision: Insights from the Neoproterozoic Calzadilla Metaophiolite (SW Iberia) journal article 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URL https://docta.ucm.es/bitstreams/36e511fe-f8a0-417b-9a67-14ec2157e169/download File MD5 3e574d39b9ac45eb29c3cc0ad23ecb3d 22653721 application/pdf From onset of Cadomian subduction to forearc-arc-continent.pdf URL https://docta.ucm.es/bitstreams/54a64248-8e52-4b22-b8aa-db8e6d237387/download File MD5 b3389d6663a5e8ebcc28100525097b75 122973 text/plain From onset of Cadomian subduction to forearc-arc-continent.pdf.txt