Flexural isostatic response of the Alps to increased Quaternary erosion recorded by foreland basin remnants, SE France - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Terra Nova Année : 2008

Flexural isostatic response of the Alps to increased Quaternary erosion recorded by foreland basin remnants, SE France

Résumé

We test the hypothesis that flexural isostatic compensation of the mass removed by enhanced Quaternary erosion is responsible for uplift of the Western European Alps and their forelands. We use two well-preserved and well-dated (1.8 Ma) abandonment surfaces of foreland basin remnants in SE France (the Chambaran and Valensole plateaux) as passive benchmarks for tilting of the foreland. Estimating their initial slope from morphometric scaling relationships, we determine bulk post-depositional tilting of 0.5–0.8% for these surfaces. The calculated isostatic response of the Alpine lithosphere to erosional unloading, using the method recently proposed by Champagnac et al. [Geology 35 (2007) 195–198], yields a predicted tilting of 0.3–0.4% in the considered areas, explaining approximately half of the determined post-depositional tilting. Such long-term deformation being insensitive to cyclic loading/unloading because of glaciations, we suspect the other half to be related to as yet undetermined long-wavelength and long-lived tectonic process(es).
Fichier principal
Vignette du fichier
Champagnac_etal_TN_final.pdf (5.34 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00286536 , version 1 (09-06-2008)

Identifiants

Citer

Jean-Daniel Champagnac, Pieter van Der Beek, Gaël Diraison, Samuel Dauphin. Flexural isostatic response of the Alps to increased Quaternary erosion recorded by foreland basin remnants, SE France. Terra Nova, 2008, 20 (3), pp.213-220. ⟨10.1111/j.1365-3121.2008.00809.x⟩. ⟨hal-00286536⟩
209 Consultations
358 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More