Review of the Ediacaran-Lower Ordovician (pre-Sardic) stratigraphic framework of the Eastern Pyrenees, southwestern Europe

Maxime Padel (1) , Sébastien Clausen (2) , José Javier Álvaro (3) , Josep Maria Casas (4)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 Université de Lille
3 UCM - Universidad Complutense de Madrid = Complutense University of Madrid [Madrid]
4 UB - Universitat de Barcelona

The Ediacaran-Lower Ordovician successions exposed in the Eastern Pyrenees are updated and revised based on recent U-Pb zircon radiometric ages, intertonguing relationships of carbonate-dominated strata, and onlapping patterns marking the top of volcano-sedimentary complexes. A stratigraphic comparison with neighbouring pre-Variscan outcrops from the Montagne Noire (southern French Massif Central) and Sardinia is related to i) the absence of Cadomian deformation close to the Ediacaran-Cambrian boundary interval; ii) the presence of an episodic, Cadomian-related, acidic-dominant volcanism related to carbonate production punctuating the Ediacaran-Cambrian transition, similar to that recorded in the northern Montagne Noire; and iii) the lack of Guzhangian (Cambrian Epoch 3) regressive shoal complexes present in the Montagne Noire and probably in Sardinia

Mots clés: Lithostratigraphy; Chronostratigraphy; Palaeogeography; Cambrian; NW Gondwana

Domaines: Planète et Univers [physics]; Sciences de la Terre; Stratigraphie; Planète et Univers [physics]; Sciences de la Terre

Maxime Padel, Sébastien Clausen, José Javier Álvaro, Josep Maria Casas. Review of the Ediacaran-Lower Ordovician (pre-Sardic) stratigraphic framework of the Eastern Pyrenees, southwestern Europe. Geologica Acta, 2018, ⟨10.1344/GeologicaActa2018.16.4.1⟩. ⟨hal-02309563⟩