Vai al contenuto principale

Mimicking Alpine thrusts by passive deformation of synsedimentary normal faults: a record of the Jurassic extension of the European Margin (Mont Fort nappe, Pennine Alps)

Pubblicato: Mercoledì 3 marzo 2021

Webinar di Geologia - Giovedì 11 Marzo 2021 alle ore 16.00 si terrà il webinar (via webex):

Mimicking Alpine thrusts by passive deformation of synsedimentary normal faults: a record of the Jurassic extension of the European Margin (Mont Fort nappe, Pennine Alps)

Jean-Luc Epard

(Université de Lausanne)

Abstract: In the Alps of western Switzerland, the European rifted margin is traditionally represented as being affected by normal faults that delimit basins separated by horsts. These define the different paleogeographic domains. During the alpine orogeny, the basins are reversed to form nappes, but the behavior of the former normal faults remains controversial. Examples of synsedimentary normal faults preserved under conditions of increasing metamorphism show that at least part of these ancient faults are not reactivated and deform passively during alpine orogeny. A recent study in the Middle Penninic nappes (the Mont-Fort nappe) showed that a contact considered as thrust separating two distinct tectonic units was in fact a synsedimentary fault passively folded by subsequent ductile deformations.

Ultimo aggiornamento: 03/03/2021 10:17
Non cliccare qui!