Oskar Vidal Royo1, Josep Anton Muñoz1, and Hemin A. Koyi2
1Geodynamics and Geophysics - University of Barcelona, Geomodels - Geodynamics and Basin Analysis Group, Barcelona, Spain
2Department of Earth Sciences - University of Uppsala, Solid Earth Geology, Uppsala, Sweden
Pico del Águila Anticline is located in the central External Sierras (Jaca-Ainsa Basins, Southern Pyrenees, Spain). These ones constitute the frontal unit of Southern Pyrenees, being structured in a complex of imbricated thrust sheets detaching on evaporitic-dolomitic Triassic facies, and displaced southwards over the Tertiary sediments of the Ebro foreland basin. Central External Sierras are characterized by a set of anticlines which, as Pico del Águila, present a N-S structural trend, perpendicular to the E-W general trend in Pyrenees. The aim of this work is to determine the 3D geometry of Pico del Águila, in order to establish its geodynamic evolution as well as to provide a basis to evaluate its importance as an analogous reservoir for natural resources. Due to the coexistence of both E-W and N-S structural trends, the presence of syntectonic sedimentary prisms at both sides, as well as the superb outcrop conditions and high preservation of the structure, Pico del Águila anticline becomes a magnificent example to apply diverse tools in 3D geological reconstruction. Consequently, different modeling techniques were applied, shedding light in new aspects of the Pico del Águila evolution. 3D reconstruction of field geometries and analog modeling experiences have been integrated and validated to obtain a unique consistent model of evolution. The 3D geometry of the fold, the fracture distribution due to bending between E-W and N-S coeval structures, and the reconstruction of the synfolding sedimentary prisms have been pointed out by the 3D structural modeling. The analog modeling experiences have reproduced the structural style of the area and have also showed that frictional changes in the detachment level are able to generate perpendicular-to-shortening structures without rotation needed.
AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas