--> Abstract: 3D Reconstruction of an Oblique Fault and Fold System and Related Growth Strata: Ainsa Basin, Spanish Pyrenees, by Oscar Fernandez, Josep Anton Munoz, Pau Arbues, and Oriol Falivene; #90039 (2005)

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3D Reconstruction of an Oblique Fault and Fold System and Related Growth Strata: Ainsa Basin, Spanish Pyrenees

Oscar Fernandez1, Josep Anton Muñoz2, Pau Arbués3, and Oriol Falivene3
1 Midland Valley Exploration, Glasgow, United Kingdom
2 Universitat de Barcelona, Barcelona, Spain
3 University of Barcelona, Barcelona, Spain

The Eocene Ainsa Basin is affected by 4 main N-S trending anticlines: Mediano, Añisclo, Boltaña, and Olsón. Along-strike evolution of one of these folds (Mediano anticline) has revealed the importance of the 3D analysis of fold geometry and syn-tectonic strata to understand temporal fold evolution. The 3D reconstruction of the Ainsa Basin fault and fold system which is presented has been built from surface and subsurface data. Construction has been done from a purely 3D approach, implementing a new 3D-construction methodology. The results of this reconstruction reveal new aspects of the folds in this system which hadn't been previously recognized. Evolution of fold geometry along strike has been related to the change of fold style from detachment to fault-related folding, as well as the interference of E-W folding induced by basement unit underthrusting. 3D geometry of related growth strata constrains the temporal evolution of the N-S folding as well as the overimposed E-W folding. The three-dimensional geometry of the folds and their related syntectonic slope complex, provide new insights into the spatial and temporal relation between fold growth and turbidite deposition.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005