Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Post-orogenic exhumation in the western Pyrenees; evidence for extension driven by pre-orogenic inheritance

Charlotte Fillon, Frederic Mouthereau, Sylvain Calassou, Raphael Pik, Nicolas Bellahsen, Cecile Gautheron, Daniel Stockli, Stephanie Brichau, Norman Daril, Margaux Mouchene and Peter Van der Beek
Post-orogenic exhumation in the western Pyrenees; evidence for extension driven by pre-orogenic inheritance
Journal of the Geological Society of London (November 2020) 178 (2)

Abstract

The drivers of the Pyrenean post-orogenic exhumation are debated including drainage migration, flexural rebound or tectonic reactivation. Here, we provide new low-temperature thermochronological data and inverse thermal modeling from both the hinterland and foreland of the western Pyrenees. Our new thermochronological ages range from 6.6 Ma to 61.4 Ma and reveal a late Miocene exhumation phase in several massifs. The contrasted thermal histories define a domain of focused exhumation in the western Pyrenees that coincides with the present-day extensional tectonics in a region to the north of the Axial Zone. Based on the inferred cooling rates and paleogradient estimates, we highlight an exhumation phase of approximately 1 mm/yr between 11 and 9 Ma in the Axial Zone, well above rates expected for a post-orogenic evolution. The thermal evolution inferred from three boreholes of the Aquitaine foreland basin reveals that sediments eroded from the hinterland did not accumulate in the piedmont region but were transported offshore in the Bay of Biscay. We infer that the significant approximately 10 Ma-post-orogenic exhumation event must be related to the modern normal faulting regime of the western Pyrenees, associated to contrasting crustal thickness and densities, inherited from the Mesozoic rift evolution of the northern Pyrenees. Supplementary material: https://doi.org/10.6084/m9.figshare.c.5212581


ISSN: 0016-7649
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 178
Serial Issue: 2
Title: Post-orogenic exhumation in the western Pyrenees; evidence for extension driven by pre-orogenic inheritance
Affiliation: Total EP, R&D Nexts, Pau, France
Published: 20201123
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 50
Accession Number: 2021-010076
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N42°00'00" - N44°00'00", W01°00'00" - E01°00'00"
Secondary Affiliation: Universite de Toulouse, FRA, FranceUniversite de Lorraine, FRA, FranceSorbonne Universite, FRA, FranceUniversite Paris-Saclay, FRA, FranceUniversity of Texas at Austin, USA, United StatesUniversite Grenoble Alpes, FRA, France
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202107
Close Modal

or Create an Account

Close Modal
Close Modal