Magnetoestratigrafía y evolución tectonosedimentaria de la cuenca de la Pobla de Segur (Formación Collegats, Zona Central Surpirenaica)

• Autores: E. Beamud, Lluís Cabrera Pérez, Miguel Garcés Crespo, Josep Anton Muñoz i de la Fuente
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 3, 1, 2001 (Ejemplar dedicado a: XIV Congreso Nacional de Sedimentología, IV Congreso del Cretácico de España), págs. 79-81
• Idioma: español
• Enlaces
  • Texto Completo Ejemplar
• Resumen

  • The continental conglomerates of the Collegats Fm. were for long considered a postorogenic unit as they fossilized an spectacular paleorelief. Nevertheless recent studies showed that these materials were also affected by compressional deformation. The chronostratigraphy of the Collegats Fm.

    was constrained to Middle-Upper Eocene to Oligocene based on few mammal fossil localities that yielded an MP17 (Late Eocene) mammal age for the middle part of the sequence. Thus a magnetostratigraphic study was carried out to solve the age uncertainties. Dating this conglomeratic succession is important as it represents the latest synorogenic depositional record of the South Pyrenean thrust and fold belt evolution. Moreover: a more precise dating of the development of main tectonic structures should make easier unraveling the kinematics of the late thrust emplacement in the South-Central Pyrenees.