A detailed study of the late Early-Middle Aptian carbonate platforms in the western Galve subbasin (Maestrat basin, E Iberian Chain; E Spain) was made to identify the basic accretional unit. This basic building block corresponds to a high-order depositional sequence bounded by maximum regressive surfaces, and develops at three different sea-level stages: early transgressive, late transgressive and regressive. During these sea-level eustatic fluctuations, deposition of six different lithofacies assemblages occurs along four specific sedimentary environments: platform, platform margin, slope and basin. The early transgressive pulse is represented by an orbitoline-rich level linked to the seawater eutrophication. The late transgressive pulse is characterized by a building-up episode dominated by rudists, corals, orbitolines and ammonites. The increase in hydrodynamic energy-conditions, associated with the subsequent regression, resulted in debris flow deposition. The carbonate platform studied is interpreted as a flat topped non rimmed shelf.
© 2001-2024 Fundación Dialnet · Todos los derechos reservados