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

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.

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Acknowledgements

The authors are indebted to Bernard Laumonier by his invaluable discussions in the field, and to Profs. Jürgen von Raumer and Holger Paulick by their useful and constructive revisions. Funding for this research was yielded by RGF program of the French Geological Survey (BRGM) and projects CGL2013-48877-P and CGL2015-66335-C2-1-R from Spanish MINECO.

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Correspondence to J. Javier Álvaro.

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Padel, M., Álvaro, J.J., Casas, J.M. et al. Cadomian volcanosedimentary complexes across the Ediacaran–Cambrian transition of the Eastern Pyrenees, southwestern Europe. Int J Earth Sci (Geol Rundsch) 107, 1579–1601 (2018). https://doi.org/10.1007/s00531-017-1559-5

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Keywords

  • Stratigraphy
  • Carbonate production
  • Volcanism
  • Geochemistry
  • LA-ICP-MS U–Pb dating
  • West Gondwana