Le Cénomanien supérieur-Turonien dans la zone centrale de la chaîne ibérique (Espagne): Une étape sédimentaire très particulière dans l'évolution de la plate-forme crétacée

Abstract

The Upper Cenomanian-Turonian of the Central area of the Iberian Range constitutes a single sedimentary stage bounded at its bottom and top by stratigraphic disconformities. The sedimentary stage is very different from those other stages of the Cretaceous of this region because: it is the most important transgressive event as it leaves the only pelagic deposits of the Cretaceous of this region; it is the quickest transression as the pelagic deposits even rest over continental facies; it means the most important paleogeographic change of the Cretaceous as it is the first time in which the Atlantic sea floods over the whole Iberian domain; the progradation of the platform occurs during the regression of this stage and it is the only one known in the stratigraphic record of the Iberian Range. This sedimentary evolution is explained by a fastsea level rise to the limit of the Middle Cenomanian to the Upper Cenomanian followed by a sea level decrease during the Turonian.