Palaeogeography of the late aquitanian-early Burdigalian basin in the western Betic Internal Zone

• Published in: Geobios
• Main Authors: Sanz de Galdeano, Carlos, Serrano, Francisco, López-Garrido, A. C., Martín Pérez, José Antonio
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 1993
• Subjects: Betic internal zone; Burdigalian; Planktonic foraminifera; Nannoplankton; Zone bétique interne; Burdigalien; Foraminifères planctoniques; Nannoplancton; Zona interna Bética; Burdigaliense; Foraminíferos planctónicos; Nanoplancton; Découverte
• Online Access: http://hdl.handle.net/10261/31446; https://doi.org/10.1016/S0016-6995(93)80005-C

13 páginas, 7 figuras, 1 tabla. [EN] The discovery of new outcrops of transgressive sediments in the western Betic Internal Zone belonging to the UpperAquitanian-Lower Burdigalian (Blow's N.4?, N.5 and N.6 zones of planktonic foraminifera and CN-1C calcareous nannoplankton of Okada & Bukry) shows that the basin was very large and was not restricted to the frontal part of the Internal Zone. This basin was formed in a distensive environment where marine sediments rich in siliceous materials accumulated at a depth of several hundred metres. It was tectonically controlled by faults at present showing an approximately N90 direction, which delimited several subsiding areas, between which some reliefs emerged. Sedimentation was interrupted by the tectonic superposition of the Campo de Gibraltar Complex during the Early Burdigalian. The evolution of the basin took place in the context of the important events occurring at this time in the western Mediterranean, particularly the uppermost Aquitanian-Burdigalian distension and the westward displacement of the Betic-Rifian Internal zone. [FR] La découverte de nouveaux affleurements de sédiments de l'Aquitanien supérieur-Burdigalien inférieur, transgressifs dans la partie occidentale de la Zone Interne Bétique (Zones de foraminifères planctoniques N.4?, N.5 et N.6 de Blow et zone CN-1C de nannoplancton calcaire de Okada & Bukry), montre que le bassin de l'Aquitanien supérieur-Burdigalien inférieur avait une large extension et ne se limitait pas au front de la zone interne. Ce bassin s'est formé en contexte distensif, recevant des sédiments marins, de plusieurs centaines de mètres de profondeur, riches en matériel siliceux. Il a été tectoniquement contrôlé par des failles avec une direction actuelle N90 approximativement, qui ont formé plusieurs sillons subsidents, parmi lesquels quelques reliefs pouvaient émerger. La superposition tectonique du matériel allochtone du Complexe du Campo de Gibraltar pendant le Burdigalien inférieur a interrompu la sédimentation. ...