Resumen de Evolución sedimentaria reciente de dos sistemas turbidíticos del área de Motril (NE Alborán). Parte II: sistema turbidítico de Sacratif
Fernando Pérez Belzuz, Belén Alonso Martínez
The morphology, the sedimentary architecture and the recent sedimentary evolution of the Sacratif Turbidite System has been studied trough the analysis of ultra-high resolution seismic profiles (TOPAS) and swath bathymetry (EM-12). This turbidite tystem, which is classified as a "canyon-fed turbidite system", is active during the Plio-Quaternary. The youngest architectural elements of this turbidite system are two channel-levee complexes with big straight to sinuous channels which pass down-basin towards a channelized lobe. Channel-levee complexes are fed by two big canyons, the Eastern Canyon which is deeply incised in the inner shelf and the Western Canyon which is located near the mouth of the Cuadalfeo River. Three phases has been stabilised in the recent sedimentary evolution of the Sacratif Turbidite System: (1) Widespread erosion and generation of sandy lens bodies; (2) Agradation of channel-levee complexes and distributary channels; (3) Widespread erosion and formation of a sandy lens body. The geological characteristics of canyons feeding this system (deeply incised, proximity to river mouth, tectonic activity) allows the trigger of high-energy channelized gravity flows during the Holocene sealevel rise and highstand.
