Optically Stimulated Luminescence to Date Coastal Dunes and a Possible Tsunami Layer on the Kavak Delta (Saros Gulf, NW Turkey)

Authors : AHMET EVREN ERGİNAL, NAFİYE GÜNEÇ KIYAK HASAN ÖZCAN

Pages : 465-474

View : 32 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Optically stimulated luminescence insert ignore into journalissuearticles values(OSL); dating was used to determine the timing of initial dune formation and reconstruct the evolution of coastal dunes that developed on the Kavak Delta, Saros Gulf, Turkey. Along a 500-m-long representative transect, dune sands were extracted from foredune, semistable insert ignore into journalissuearticles values(grey); dune, stable insert ignore into journalissuearticles values(dark); dune and dune-swamp boundary defined by a scarp 50-75 cm high. The data obtained showed that dune drift initiated 670 years ago. A pumice layer 15-20-cm-thick interbedded with marine clay and sand showed an OSL age of 340 years coinciding with underlying dune sand. XRF analysis showed that pumices were of similar composition to those erupted by plinian activity of Thera insert ignore into journalissuearticles values(Santorini); in 1628 BC. On the basis of OSL ages, these deposits, which are widely distributed on the western Anatolian coasts of Turkey, might have presumably transported landward along tide channels on the delta during a tsunami event that occurred in 1672 near Bozcaada and Kos islands according to tsunami history of the Aegean Sea.
Keywords : coastal dune, coastal geomorphology, dune boundary, OSL dating