Crustal Architecture of the Pyrenees - Archive ouverte HAL Accéder directement au contenu
Chapitre D'ouvrage Année : 2022

Crustal Architecture of the Pyrenees

Marc Calvet
Magali Delmas
Yanni Gunnell
Bernard Laumonier

Résumé

The Pyrenean orogen is the product of the N–S collision between Eurasia and Iberia and has involved at least 100 km of crustal shortening. Between the Aquitaine Basin in the north and the Ebro Basin in the south, the mountain belt varies in width from 75 to 150 km and is divided into a succession of five tectonostratigraphic belts known as the (i) Sub-Pyrenean Zone and (ii) North-Pyrenean Zone, where in both cases Alpine structures are north-vergent (European domain); and the (iii) Axial Zone, (iv) Nogueres Zone and (v) South-Pyrenean Zone, where Alpine structures are south-vergent (Iberian domain). Those two tectonic domains are separated by the North-Pyrenean Fault, a major crustal-scale discontinuity. This chapter describes these first-order structural units and their history of emplacement: pre-orogenic crustal extension and marine sedimentation (Triassic to Cenomanian), then convergence followed by collision in two successive stages during the late Cretaceous and Paleogene. The palaeogeography of the earlier Mesozoic topography (proto-Pyrenees) and of the main collisional orogen prevalent in mid Cenozoic time (syn-orogenic, or ancestral, Pyrenees) is sketched out. The chapter also provides a state-of-the-art reassessment of Pyrenean nappe-stack architecture based on evidence from the eastern Pyrenees, and discusses geophysical and structural data in relation to the present-day topography of the mountain range (i.e., the post-orogenic, or modern, Pyrenees).
Fichier non déposé

Dates et versions

hal-03996094 , version 1 (19-02-2023)

Licence

Identifiants

Citer

Marc Calvet, Magali Delmas, Yanni Gunnell, Bernard Laumonier. Crustal Architecture of the Pyrenees. Marc Calvet; Magali Delmas; Yanni Gunnell; Bernard Laumonier. Geology and Landscapes of the Eastern Pyrenees, 1, Springer International Publishing, pp.3-26, 2022, GeoGuide, 978-3-030-84266-6. ⟨10.1007/978-3-030-84266-6_1⟩. ⟨hal-03996094⟩
29 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More