The Holocene Tordera Delta System - On/Offshore Sedimentary Sequences and Evolution

The Tordera River delta system is located on the NE coast of the Iberian Peninsula. It is a coarse-sand delta originated from the erosion of the granitoids in the Catalan Litoral mountain range system. The Tordera delta has originated in a Mediterranean fluvial regime and with the influence of coastal drift currents from the SW. The sediments carried by the Tordera, together with the contributions from local streams has originated the different sand bodies present in the Blanes inner shelf. From new marine seismic data we have described the internal structure of these sand bodies as well as defined three seismic sequences which are Ph, Sd2 and Sd3. At the same time, the seismic profiles have provided additional support to the correlation of these sequences with the sedimentary deltaic sequences, as well as detail to the evolution of these sand bodies during the last sea level rise. The samples obtained though vibrocores and dredges have allowed the sedimentary characterisation of the sand bodies and their correlation to the deltaic sequences (absolute and relative aging) as well as the absence of sedimentary drift transport from the NE.