Cagatay M.N.(1), .Görür N.(2), Polonia A.(3), Demirbag E.(1), Sakinç M.(1) , Cormier M.H.(4), Capotondi L. (3), McHugh C(4), Emre O.(5), Eris K. (1)
1- ITU, MadenFakültesi,Turkey; 2- ITU, MadenFakültesi and TUBITAK Marmara Research Centre, Turhey 3- ISMAR-CNR Bologna, Italy 4- Lamont-Doherty earth Observatory, New York, USA 5-MTA Genel Müdürlügü, Ankara
Offshore and onshore stratigraphic studies, together with high-resolution shallow seismic reflection profiling and multibeam bathymetric mapping, were carried out in the western and central part of the Izmit Gulf. These studies indicate that the Izmit Gulf was a lacustrine environment as part of the Marmara lake during the late glaciation and early deglaciation until ~12 kyr BP, when the Marmara basin was inundated by the Mediterranean waters. Correlation of 14C-dated onshore and offshore stratigraphic units in the western Izmit Gulf indicates that generally coarse late glacial sediments overlie a marked erosion surface formed during the low water level of the Marmara Lake. These coarse sediments are succeeded by 10.4-7 kyr BP old transgressive and by late Holocene post-transgression mud units. The bathymetry and subbottom chirp profiles clearly show that the palaeoshoreline of this lake was located at -85 m, having been controlled by the bedrock sill depth of the Çanakkale Strait. Another palaeoshoreline observed 65 m on northern margin of the Western Izmit and Karamürsel basins was probably formed during the Younger Dryas sea-level stillstand. The shelf areas during about this time were colonized by bioherms, which were subsequently drowned and disappeared after further rise of the sea level. The presence of a 65 m marine paleoshoreline in the Karamürsel basin indicate that the sill restricting this basin to the west was much deeper than its present 55 m level and placed further south. The Gölcük basin restricted by a 38 m sill to its west, was probably not flooded by marine waters until ~9 kyr BP.
Marine geology (Print) 202 , pp. 159–173
Marmara Sea, Izmit Gulf, sea level changes, late glacial Holocen, sediment cores
Polonia Alina, Capotondi Lucilla
ID: 48806
Year: 2003
Type: Articolo in rivista
Creation: 2009-06-16 00:00:00.000
Last update: 2009-06-16 00:00:00.000
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CNR OAI-PMH: oai:it.cnr:prodotti:48806