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The response of the French sedimentary basins to the Pyrenean and Alpine compressive phases: insights from the reprocessing and interpretation of regional seismic lines

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HAL Id: hal-00682441

https://hal-brgm.archives-ouvertes.fr/hal-00682441

Submitted on 26 Mar 2012

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The response of the French sedimentary basins to the Pyrenean and Alpine compressive phases: insights from

the reprocessing and interpretation of regional seismic lines

Laurent Beccaletto, Olivier Serrano, Renaud Couëffé, Laure Capar, Stéphane Marc

To cite this version:

Laurent Beccaletto, Olivier Serrano, Renaud Couëffé, Laure Capar, Stéphane Marc. The response

of the French sedimentary basins to the Pyrenean and Alpine compressive phases: insights from the

reprocessing and interpretation of regional seismic lines. 34th International Geological Congress, Aug

2012, Brisbane, Australia. �hal-00682441�

(2)

The response of the French sedimentary basins to the Pyrenean and Alpine compressive phases: insights from the reprocessing and interpretation of regional seismic lines

Laurent BECCALETTO

1

, Olivier SERRANO

1

, Renaud COUEFFE

1

, Laure CAPAR

1

, Stéphane MARC

1

1

BR GM-French Geological Survey , Geology Division, Orléans, France, Email l.beccaletto@brgm.fr

The French Geological Survey (BRGM) has recently launched the regional structural s eismic study of the 4 major French sedimentary basins (Paris Basin, Aquitaine basin, South-East basins, and Upper Rhine Graben).

69 regional transects, representing a total of about 7,100 km length, have been reprocessed and interpreted. The transects are made of hundreds seismic profiles recorded by the petroleum operators between the 60' and the 90'. Our paper specifically aim (1) to introduce the methodology used by the BRGM in the building and reprocessing of these regional seismic lines, and (2) to present the first results given by their interpretation.

We put the emphasis on the structural frame of the various basins, with a focus on their responses to

the Late Cretaceous -to-Eocene Pyrenean and Miocene Alpine compressive phases. The decollement

role of the salt diapirs is highlighted in the Aquitaine Basin. In the Paris Basin, the deformation is

characterized by the occurrence of short-wavelength f olds and asymmetrical anticlines, generally

related to the reverse reactiv ation of previous normal faults. The South-East basins are characterized

by low-angle thrusts rooted in the saliferous Triassic levels. As for the Upper Rhine Graben, it

exemplifies the relationships between the Alpine Jura thrusts and the strike-slip structures related to

the regional Eo-Oligocene rifting phase. We finally confirm the widespread genetic links between

inherited (e.g. late Variscan) and lat e Cretaceous to Cenozoic tectonic structures.

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