DETERMINATION OF THE HOLOCENE SEDIMENTERY SUCCESSION OF THE EASTERN PART OF THE GULF OF SAROS BY HIGH RESOLUTION SEISMIC

Öz

This study was held on the Gulf of Saros, which located on the North Anatolian Fault Zone, is a tectonically active region. The aim of this study to present the character and distrubition of the sedimentary deposits at the eastern part of the Gulf of Saros by using seismic stratigraphical methods. Previous studies that characterize the interior of the gulf were not present sufficient data to determine the character of the sedimatery deposits of the inner part of the gulf. About 300 km seismic data were acquired by small boat at the inner side of the gulf during the 15- day. The data were interpreted in the sense of seismic stratigraphical properties of the gulf. 5 units were defined according to internal reflection differences and depositional conditions and named as U1a, U1b, U1c, U1d, U2. The main factor of the gulf, which controls depositional system, is North Anatolian Fault Zone. The northern shelf of the bay was affected by the rivers during the high-stand to low-stand period whereas the southern shelf was aerially exposed

Anahtar Kelimeler

• North Anatolian Fault Gulf of Saros, seismic stratigraphy, High resolution shallow seismic

SAROS KÖRFEZİ DOĞU KESİMİNİN YAKIN GEÇMİŞ DEPOLANMA ÖZELLİKLERİNİN YÜKSEK ÇÖZÜNÜRLÜKLÜ SIĞ SİSMİK VERİLER İLE BELİRLENMESİ

Öz

Çalışma Kuzey Anadolu Fay Zonunun üzerinde bulunan ve tektonik olarak aktif bir bölge olan Saros Körfezinde yapılmıştır. Bu çalışmanın amacı körfezin doğu kısmındaki çökel birimlerinin karakterini ve dağılımını sismik stratigrafik prensiplerle belirlemektir. Daha önceki çalışmalarda körfezin iç kısmını karakterize eden yeterli derecede veri seti bulunmadığından çalışma alanının depolanma özellikleri ayrıntılı olarak belirlenememiştir. Bu amaçla körfezde 15 günlük deniz çalışması süresince yaklaşık 300 km sismik veri toplanmıştır. Toplanan bu veriler sismik stratigrafik yorumlanmıştır. Çalışma sahasında içsel yansıma farklılıkları ve depolanma unsurlarına göre 5 sismik yansıma birimi tanımlanmış ve U1a, U1b, U1c, U1d, U2 olarak isimlendirilmiştir. Körfezin çökel depolanmasını kontrol eden ana faktörün Kuzey Anadolu Fay Zonu olduğu ve çalışma sahasının kuzeyinin son düşük deniz seviyesi boyunca nehirsel etkilere maruz kaldığı buna karşın güneyin aşınım alanı olduğu belirlenmiştir

Anahtar Kelimeler

• Kuzey Anadolu Fayı Saros Körfezi, Sismik stratigrafi, Yüksek çözünürlüklü sığ sismik

Kaynakça

1. Aksu, A.E., Hiscott., R. N., Yaltırak, C. 2016. Early Holocene age and provenance of a mid-shelf delta lobe south of the Strait of Bosphorus, Turkey, and its link to vigorous Black Sea outflow. Marine Geology 380, 113–137
2. Bard, E., Hamelin, B., Fairbanks, R.G. 1990. U-Th ages obtained by mass spectrometry in corals from Barbados: sea level during the past 130000 years. Nature 346:456– 458.
3. Barka, A. A., Kadinsky-Cade, K. 1988. Strike–slip fault geometry in Turkey and its influence on earthquake activity. Tectonics 7 (1), 663–684.
4. Çağatay, N., Algan, O., Sarı, E., Orhon, V. 1997 . Saros ve Gökova Körfezlerinde Sedimentlerin
5. TUBİTAK, YDAÇAG 435/G, İstanbul. [5] Çağatay, N., Görür, N., Alpar, B., Saatçılar, R., Akkök, R., Sakınç, M., Yüce, H., Yaltırak, C., Kuşçu, İ., 1998. Geological evolution of the Gulf of Saros, NE Aegean Sea. Geo Mar Lett 18, 1–9.
6. Fairbanks, R.G. 1989. A 17,000-year glacio-eustatic sealevel record: influence of glacial melting rates on the younger Dryas event anddeep- ocean circulation. Nature 342:637– 642.
7. Görür, N., Çağatay, M.N., Sakınç, M., Sümengen, M., Şentürk, K., Yaltırak, C., Tchapalyga, A., 1997. Origin of the Sea of Marmara as deducted from the Neogene to Quaternary paleogeographic evolution of its frame. Int Geol Rev 39, 342–352.
8. Hiscott, R.N., Aksu, A.E., Yasar, D., M.A., Kaminski,

9. Kostylev, V.E., MacDonald, J.C., Isler. F.I., Lord, A.R. 2002. Deltas south of the Bosphorus Strait record persistent Black Sea outflow to the Marmara Sea since *10 ka. Mar Geol 190:95–118.
10. P.J., [9] Kurt, H., Demirbağ, E., Kuşçu, I. 2000. Active submarine tectonism and formation of the Gulf of Saros, NE Aegean Sea, inferred from multi-channel seismic reflection data. Mar Geol 165, 13–26.
11. Lambeck, K., Yokoyama, Y., Purcell, T. 2002. Into and out of the Last Glacial Maximum: sea-level change during oxygen isotope stages 3 and 2. Quat. Sci. Rev. 21, 343–360.
12. McNeill, L.C., Mille, A., Minshull, T.A., Bull, J.M., Kenyon, N.H., Ivanov, M. 2004. Extension of the North Anatolian Fault into the North Aegean Trough: evidence for transtension, strain partitioning, and analogues for Sea of Marmara basin TC2016,doi:10.1029/2002TC0014 90.
13. : [12] Pfannenstiel, M. 1944. Diluviale Geologie des Mittelmeergebietes, die diluvialen Entwicklungstadien und die Urgeschichte von M., Terlemez,
14. I., Şentürk, K., Karaköse, C., Erkan, E., Ünay, E., Gürbüz, M,. Atalay, Z. 1987.Stratigraphy, sedimentology, and tectonics of the Tertiary sequences in Gelibolu Peninsula and southwestern Thrace. Bulletin of the Mineral Research and Exploration Institute of Turkey Technical Report 8128, Ankara (in Turkish).
15. Tüysüz, O., Barka, A.A., Yiğitbaş, E. 1998. Geology of the Saros Graben: its implications on the evolution of the North Anatolian Fault in the Ganos–Saros Region, NW Turkey. Tectonophysics 293, 105–126.
16. Ustaömer, T., Gökaşan, E., Tur, H., Görüm, T., Batuk, F., Kalafat, D., Alp, H., Ecevitoğlu, B., Birkan, H. 2008. Faulting,
17. Deposition in an Active Dextral Shear Zone, the Gulf of Saros and the NE Aegean Sea, NW Turkey. Geo-Marine Letters, 28, 171-193.
18. Yaltırak, C., Alpar, B., Yüce, H. 1998. Tectonic elements controlling the evolution of the Gulf of Saros (northeastern Aegean Sea, Turkey). Tectonophysics 300, 227–248.
19. Yaltırak, C., Alpar, B., 2002. Kinematics and evolution of the northern branch of the North Anatolian Fault (Ganos Fault) between the Sea of Marmara and the Gulf of Saros. Mar. Geol. 190, 351-366.