2:30 PM - 2:45 PM
[SGL36-12] Late Pleistocene and Holocene stratigraphy of the Gulf of Saros; new Chirp seismic data
Keywords:seismic stratigraphy, Chirp seismic, Aegean Sea
The deposits above the acoustic basement are divided into four distinctive seismic units. The bottommost unit U1d overlies the pre-Early Miocene basement, and accumulated from the onset of coastal transgression until the time of maximum transgression of the coast, with sediments onlap the underlying erosional truncation surface. The unit U1c comprises fluvial sigmoidal reflections with sediments downlap the underlying unit and show highstand - lowstand period. The unit U1b comprises marginal marine and fluvial sediments deposited during the lowstand period. Finally, the topmost unit U1a and its parallel inner reflections represent the last transgression.
Two different depositional characteristics have been defined in the gulf, as they are separated by an actual fault system. On the southern margin, the transgressive deposits of unit U1a lie directly above the pre-Early Miocene basement while fluvial sigmoidal deposits of the unit U1c and marginal marine and fluvial deposits of the unit U1b can be seen on the northern margin, and they form 30-ms (twt) thick sedimentation deposited under the control of northerly riverine inputs during highstand to lowstand periods. The stratigraphic setting in the gulf supports a dextral movement along the NNAT. The unit U1c is widely distributed in the middle of the studied area. Some buried channel geometries of the rivers, which transported the sediments of unit U1c, have been outlined at the northern sector. In addition, some characteristic sand deposits, equivalent with the unit U1d, were defined at the northern sector of the gulf. All these findings show that the northern margin is under the influence of river aggradation whilst the southern margin was an erosional platform during the last glacial maximum.