Procedència i evolució dels sistemes sedimentaris de la conca de jaca (conca d'avantpaís sudpirinenca): interacció entre diverses àrees font en un context tectònic actiu
- Autores: Marta Roigé Taribó
- Directores de la Tesis: David Gómez-Gras (dir. tes.), Eduard Remacha Grau (codir. tes.)
- Lectura: En la Universitat Autònoma de Barcelona ( España ) en 2018
- Idioma: español
- Tribunal Calificador de la Tesis: Cai Puigdefàbregas Tomàs (presid.), Miguel Angel Caja Rodríguez (secret.), Pierre Labaume (voc.)
- Programa de doctorado: Programa de Doctorado en Geología por la Universidad Autónoma de Barcelona
- Materias:
- Enlaces
- Tesis en acceso abierto en: TESEO
- Resumen
Characterization of the sediment routing evolution in foreland basins gives insights on the tectonic and erosional history of the source areas. The Eocene to Miocene clastic systems of the South Pyrenean basin are a good natural laboratory to investigate paleoenvironment, source areas and sediment composition changes during the progressive evolution of a basin.
This thesis provides a multidisciplinary approach integrating sandstone petrography, clast point counting and detrital zircon U‐Pb geochronology, applied in the Jaca basin sedimentary systems. This methodology is performed in the last turbiditic deposits from the Hecho Group, whose stratigraphic evolution from Lutetian deep‐marine to deltaic and terrestrial environments during late Eocene‐Oligocene times records a major tectonic and drainage reorganization in the active Pyrenean pro‐wedge.
A main axially drained system sourced from eastern areas, located in the central Pyrenees, is here characterized during the Hecho Group turbidite sedimentation. However, the last turbiditic deposits from the basin, known as the Rapitán turbidite channel (Bartonian), record the first sediment input sourced from new northern source areas, created by the activity of Lakora/Eaux‐Chaudes thrust. The abandonment of the turbiditic sedimentation is replaced by deltaic to terrestrial environments (Belsué‐Atarés, Sabiñánigo and Campodarbe Formations), which record the interplay of axially fed systems, sourced from the central Pyrenees, with transverse fed systems derived from new northern source areas uplifted by the activity of the Gavarnie thrust. These new source areas are composed of Paleozoic and Mesozoic materials of the North Pyrenean Zone, and by the former turbiditic foreland basin deposits that are recycled into the alluvial fan systems. During Oligocene times tectonics controlled the replacement of the axially fed systems by the transverse fed systems, from north to south, and from east to west, according to the main direction of progradation of the deformation. This situation resulted in the displacement of the axially fed system towards the western margin of the basin.
The last stage of infill of the Jaca basin during Oligocene to early Miocene times consisted on the sedimentation of the alluvial deposits of the San Juan de la Peña fan (Bernués Formation), at the same time that alluvial sedimentation was initiated in the Ebro basin, by the Luna and Huesca fans which yielded to recycling of the former foreland deposits.
This thesis highlights the importance of integrating different provenance techniques in order to resolve ambiguous provenance signals which hinder the characterization of the sediment routing evolution, chiefly in active tectonic settings, where diverse source areas can occur.
