Late Quaternary evolution of the Çanakkale Strait region (Dardanelles, NW Turkey): implications of a major erosional event for the postglacial Mediterranean-Marmara Sea connection |
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| Authors: | Erkan Göka?an Hüseyin Tur Mustafa Ergin Tolga Görüm Fatma Gül Batuk Nurcan Sa?c? Timur Ustaömer Ozan Emem Hakan Alp |
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| Institution: | (1) Natural Sciences Research Center, Yıldız Technical University, Beşiktaş, 34349 İstanbul, Turkey;(2) Present address: Department of Earth Systems Analysis, International Institute for Geo-information Science and Earth Observation (ITC), P.O. Box 6, 7500 AA Enschede, The Netherlands;(3) Department of Geophysical Engineering, İstanbul University, Avcılar, 34850 İstanbul, Turkey;(4) Department of Geological Engineering, Ankara University, Tandoğan, 06100 Ankara, Turkey;(5) Present address: Geological Research Center for Fluvial, Lacustrine and Marine Environments (AGDEJAM), Ankara University, 06100 Ankara, Turkey;(6) Department of Geodesy and Photogrammetric Engineering, Yıldız Technical University, Davutpaşa, 34210 İstanbul, Turkey;(7) Department of Geophysical Engineering, Institute of Science, İstanbul University, Beyazit, 34452 İstanbul, Turkey;(8) Department of Geology, İstanbul University, Avcılar, 34850 İstanbul, Turkey |
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| Abstract: | Seismic and bathymetric data from the Çanakkale Strait and its extensions onto the shelves of the Marmara and Aegean seas indicate that the strait was formed mainly by an erosional event. Four seismic units are observed on seismic profiles. The lower two of these (units 4 and 3) constitute the basement of a regionally widespread erosional unconformity (ravinement), which developed during marine isotope stage 2 (MIS 2). The two upper units (units 2 and 1), which overlie the ravinement surface, form a higher-order sequence. Sequence stratigraphic analysis indicates that units 2 and 1 deposited as lowstand and highstand systems tracts respectively, since the end of MIS 2. The transgressive systems tract is represented by a major erosional event which occurred throughout the Çanakkale sill area when the Mediterranean-Marmara Sea connection and, hence, the Çanakkale Strait was formed. The existence of the erosive ?arköy Canyon along the shelf edge of the southern Marmara Sea demonstrates that the flow direction causing the erosion was from south to north, thus proving that it was produced by Mediterranean water flowing over the sill into the Marmara Sea basin. |
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