Event stratigraphy of the upper Cretaceous to lower Eoceneudhemipelagic sequences of the Prebetic Zone (SE Spain):udRecord of the onset of tectonic convergence inuda passive continental margin

摘要

In the Eastern Prebetic Zone of SE Spain, upper Cretaceous to lower Eocene hemipelagic sequences deposited in the ancientudsouthern passive continental margin of Iberia are well exposed. The long-term stratigraphy of these sequences is punctuated by sixudregional tectonic events, which induced rapid changes in palaeogeography and regional tectonics. Each event configured a newudgenetic scenario for sedimentation, which lasted until the next tectonic reorganization and, in turn, controlled the deposition of anudevent bounded stratigraphic unit (EBSU). The ages of these events, determined chronobiostratigraphically, are: intra-Coniacian,udlate Santonian, “mid” Maastrichtian, latest Maastrichtian–earliest Danian, late Thanetian and intra-Ypresian. All the events, but theudfirst, are interpreted here as the result of contractional tectonic pulses, related to changes in intraplate stresses during the onset ofudAfrican–European convergence. Through correlations with both adjacent shallow marine carbonates (Prebetic platform) and basinudpelagites (Subbetic), along with other basins of Iberia and North Africa, the long-term evolution of the continental margin isudintegrated within the geodynamic framework of the western Tethys.