Delta formation at the southern entrance of Istanbul Strait (Marmara sea, Turkey): a new interpretation based on high-resolution seismic stratigraphy
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A detailed stratigraphic investigation based on high-resolution seismic profiles revealed that the delta at the southern entrance of the Istanbul Strait consists of three parasequence sets. The lowermost parasequence shows a sea-level stillstand at the beginning of the lowstand systems tract, possibly at 11,000±1,100 a b.p., whereas the upper two parasequences reflect deposition at lowstand and during the subsequent transgression. A maximum flooding surface may be developing on the delta at present. The delta is located on the eastern side of the Istanbul Strait canyon, with east–west prograding parasequences. The development of the delta is clearly associated with the Kurbağalı Stream on the east coast, and not with the Black Sea outflow through the strait. The geometry of the delta indicates a radial architecture arranged from northeast to southwest.
KeywordsTransgressive System Tract Accommodation Space Submarine Canyon Parasequence Lowstand System Tract
This study was supported by the Research Foundation of Istanbul University with Grants 75/15052003. We thank the Turkish Navy, Department of Navigation, Hydrography and Oceanography, and the personnel of the R/V T.C.G. çubuklu for their enthusiasm and care during seismic data collection.
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