Title :

A Deformed Wedge‐Top Basin Inverted During the Collapse of the Variscan Belt: The Permo‐Carboniferous Lorraine Basin (NE France)

Author(s) :

Hemelsdaël, R. [Auteur]
GeoRessources
Averbuch, Olivier [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Beccaletto, Laurent [Auteur]
Bureau de Recherches Géologiques et Minières [BRGM]
Izart, A. [Auteur]
Chercheur indépendant
Marc, Stéphane [Auteur]
Bureau de Recherches Géologiques et Minières [BRGM]
Capar, Laure [Auteur]
Bureau de Recherches Géologiques et Minières [BRGM]
Michels, R. [Auteur]
GeoRessources

Journal title :

TECTONICS

Pages :

1-27

Publisher :

American Geophysical Union (AGU)

Publication date :

2023-11

ISSN :

0278-7407

HAL domain(s) :

Planète et Univers [physics]

English abstract : [en]

A new structural model is presented for the Permo‐Carboniferous Lorraine Basin (NE France), a major intramountain basin that developed during the latest stages of the Variscan orogeny (ca. 315–270 Ma). Digitalized well ...
Show more >A new structural model is presented for the Permo‐Carboniferous Lorraine Basin (NE France), a major intramountain basin that developed during the latest stages of the Variscan orogeny (ca. 315–270 Ma). Digitalized well logs and reprocessed seismic data were used to decipher the kinematic evolution of this basin located along the Rhenohercynian orogenic suture zone. The basin was initiated during the late collision stage (Early to Middle Pennsylvanian) in a wedge‐top position upon the Saxothuringian retro‐wedge. The syn‐orogenic sequence is delimited to the north by the major SE‐verging Metz Thrust, which is part of the backthrust system that propagated during Middle Pennsylvanian (Late Westphalian). Seismic data provide evidence of negative tectonic inversion, allowing the formation of syn‐rift depocenters (Late Pennsylvanian‐Early Permian) above the former anticlines. Erosion of these anticlines results in a major unconformity marking the onset of post‐orogenic collapse. The late Early Permian shortening (Saalian phase) is suggested to reactivate former thrusts and normal faults, thus generating late uplift of the basin. The post‐orogenic phase is complex and diachronous at basin scale, and both compression and extension can be recorded in the same area over a short period (<10 Myr). The Late Carboniferous negative tectonic inversion along the Rhenohercynian suture zone is proposed to result from the lithospheric delamination of the Variscan orogenic roots. The associated upwelling of asthenospheric material is recorded by intense magmatic activity, and can be, in turn, considered as the main trigger for the subsequent thermal subsidence of the Mesozoic Paris Basin.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Popular science :

Non

ANR Project :

Isite LUE

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL