Cadomian volcanosedimentary complexes across the Ediacaran–Cambrian transition of the Eastern Pyrenees, southwestern Europe

Maxime Padel 1 J. Javier Alvaro 2 Josep Maria Casas 3 Sébastien Clausen 4 Marc Poujol 5 Teresa Sánchez-García 6
1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 instituto de geosciencias
3 Departament de Dinàmica de la Terra i de l’Oceà-Institut de recerca Geomodels
4 Evo-Eco-Paléo - Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198
5 GR - Géosciences Rennes
6 IGME - Instituto Geológico y Minero de España
Abstract : The volcanism hosted by the Ediacaran–Terreneuvian Canaveilles Group of the Eastern Pyrenees displays two distinct geochemical affinities: (1) metabasites of the Nyer and Olette formations reflect the emplacement of a tholeiitic magmatism linked to extensional conditions, whereas (2) subsequent felsic and calc-alkaline magmatic rocks marking the top of the Olette Formation and forming the overlying Fabert and Finestrelles members represent Cadomian magmatic events. Based on U–Pb zircon dating constraints, palaeotopographic relationships linked to onlap geometries and distance from vent sources, three volcanosedimentary edifices can be distinguished, the so-called Tregurà (ca. 565–552 Ma), Cap de Creus (ca. 558 Ma) and Coll d’Ares (ca. 542–532 Ma) edifices. The top of their palaeoreliefs recorded locally the nucleation of centres of microbial carbonate productivity (Puig Sec Member) linked to synsedimentary tilting and karstification. Throughout West Gondwana, the presence of carbonate production across the Ediacaran–Cambrian transition is exclusively located in back-arc settings (Central-Iberian Zone) and areas far from the Cadomian subduction trench and devoid of significant terrigenous input, such as those reported in the Eastern Pyrenees and the neighbouring Montagne Noire.
Keywords : Stratigraphy Carbonate production Volcanism Geochemistry LA-ICP-MS U–Pb dating West Gondwana
Type de document :
Article dans une revue
International Journal of Earth Sciences, Springer Verlag, 2018, 107 (5), pp.1579-1601. 〈10.1007/s00531-017-1559-5〉
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Soumis le : vendredi 6 juillet 2018 - 08:42:40
Dernière modification le : mercredi 5 décembre 2018 - 17:42:06
Document(s) archivé(s) le : dimanche 7 octobre 2018 - 12:03:01

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Maxime Padel, J. Javier Alvaro, Josep Maria Casas, Sébastien Clausen, Marc Poujol, et al.. Cadomian volcanosedimentary complexes across the Ediacaran–Cambrian transition of the Eastern Pyrenees, southwestern Europe. International Journal of Earth Sciences, Springer Verlag, 2018, 107 (5), pp.1579-1601. 〈10.1007/s00531-017-1559-5〉. 〈insu-01644354〉

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