Le Bassin lusitanien (Portugal) à l'Aptien supérieur–Albien : organisation séquentielle, proposition de corrélations, évolution

Abstract

The Lusitanian Basin (Portugal) during the late Aptian-Albian: sequential arrangement, proposal of correlations, evolution. Three transgressive-regressive 2nd-order cycles were identified in the Upper Aptian-Albian fluvial and marine deposits of the Lusitanian Basin. Its widespread nature, probably including eustatic origin, allows correlation between the southern package, with precise stratigraphic positioning, and the northern series with a poorly constrained age. The main unconformities can be related to the onset of an oceanic crust, in the western margin of Galicia during the Late Aptian, in the bay of Biscay during the Early Albian, and, to the northwest of the Galicia triple point, during the Middle to Late Albian transition, and, at the Albian-Cenomanian boundary, to a probable compressive event with Africa due to the