Numerical 3D Restoration of Eocene Features Across the Central Pyrenees (Campo-Ainsa Area)

J. Babault¹, M. de Urreiztieta², D. Rouby¹, E. Remacha³, O. Oms³, and H. Eichenseer^2
1Geosciences Rennes, CNRS, Campus de Beaulieu Rennes, Cedex, France
²ELF Exploration & Production, CSTJF Avenue Larribau, Pau, Cedex, France
³Dpt. de Geologia (Fac. Ciencies), Universitat Autonoma de Barcelona, Bellaterra, Spain

The construction and restoration of the 3D geometrical model of the studied area, between the Campo and Ainsa (Central Pyrenees), provided (1) a validation of the geometrical consistency of the interpretation of the seismic dataset, (2) a quantification the finite displacement and rotation fields. The numerical results are consistent with available paleomagnetic data.

From this 3D numerical study, we propose a new structural framework for the area. We suggest that most of the regional shortening (80%) and differential rotations between the Mediano anticline and Foradada area (20^o) is accommodated by Los Molinos thrust. The latter is showing a right lateral strike slip component of at least 7 km +/–2 and corresponds, to a lateral ramp of the South-Central Pyrenean Unit (sensu Seguret, 1972).

AAPG Search and Discovery Article #90904©2001 AAPG Pacific Section Meeting, Universal City, California