The Permo-Carboniferous Saar-Nahe Basin, south-west Germany and north-east France: basin formation and deformation in a strike-slip regime
Abstract
The Permo-Carboniferous Saar-Nahe Basin in south-west Germany and north-east France formed at the boundary between the Rhenohercynian and Saxothuringian zones within the Variscan orogen, where non-marine sediments were deposited in a narrow, structurally controlled basin. The basin has an asymmetrical geometry perpendicular to the South Hunsrück Fault. However, there is a lack of growth of the sediment pile into the fault, and isopach maps show the depocentre always located adjacent to the South Hunsrück Fault, but migrating towards the north-east with time. This pattern is typical of a strike-slip basin, indicating that the South Hunsrück Fault was a dextral strike-slip fault during sedimentation. Tectonic subsidence curves indicate that, during the Middle Devonian to Early Carboniferous, the basin subsided due to thermal relaxation of the lithosphere. A change to very rapid subsidence at the start of the Westphalian continued until late in the Autunian. This was due to mechanical subsidence associated with strike-slip movement on the South Hunsrück Fault. Towards the end of subsidence in the Saar-Nahe Basin, the Grenzlager volcanics introduced a thermal pulse into the crust, leading to thermal cooling and relaxation of the lithosphere.
- Publication:
-
International Journal of Earth Sciences
- Pub Date:
- 1995
- DOI:
- 10.1007/BF00260442
- Bibcode:
- 1995IJEaS..84..293K