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AAPG Bulletin, V.
Three-dimensional geologic imaging and tectonic control on stratigraphic architecture: Upper Cretaceous of the Tremp Basin (south-central Pyrenees, Spain)
1LMTG, Universite de Toulouse-CNRS-IRD-OMP, 14 Av. Edouard Belin, 31400 Toulouse, France; [email protected]
2Unite Mixte de Recherche 5212–CNRS: Modelisation et Imagerie en Geosciences–Pau (MIGP), Center Universitaire de la Recherche Scientifique-Institut Pluridisciplinaire de Recherche Appliquee (CURS-IPRA), Universite de Pau et des Pays de l'Adour, Avenue de l'Universite, Pau Cedex, France; [email protected]
3LMTG, Universite de Toulouse, CNRS, IRD, OMP, 14 Av. E. Belin, F-31400 Toulouse, France; [email protected]
In the Tremp Basin area (south Pyrenean foreland, Spain), the Campanian–Maastrichtian Orcau-Vell and Santa Engracia depositional sequences onlap the western termination of the Sant Corneli anticline. The precise mapping of the different systems tracts belonging to these depositional sequences, their spatial arrangement, and the structural control of the anticline on the sedimentation still remained unclear. To accurately interpret the geometry of the depositional sequences and to determine the factors influencing the sedimentation, we have developed a method that aims to build a three-dimensional (3-D) geological picture of this area. The originality of our approach is that the 3-D map, which consists of the volume and shape of all the systems tracts, has been produced mainly from the interpretation and combination of surface data, including a mosaic of aerial photographs at 50-cm (20-in.) pixel size and a digital elevation model at 10-m (33-ft) resolution. We have additionally constrained the model by integrating bedding dip and strike data and balanced cross sections. With respect to the 2-D, the 3-D visualization and field observations reveal the structural control at different scales of the lateral propagation of a fault-propagation fold (Sant Corneli anticline) on the stratigraphic architecture. The Orcau-Vell depositional sequence was controlled by the rise of the base level and was characterized by differences in the sedimentation rates. The emplacement of a north-south–trending gravitational normal fault, located at the western tip of the Sant Corneli anticline, was coeval with the emplacement of the Santa Engracia depositional sequence. This fault resulted from the westward propagation of the Sant Corneli anticline, generating a local slope and a depression that channeled the turbidites and the Gilbert-type delta deposits of the Santa Engracia depositional sequence. Uplift of the Sant Corneli anticline may have subsequently stopped, and the area subsided, inducing a rapid rise of the base level.
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