OPTICALLY STIMULATED LUMINESCENCE AND QUATERNARY STRATIGRAPHY OF MARINE TERRACES BETWEEN TRABZON AND RIZE, EASTERN BLACK SEA BASIN, TURKEY: PRELIMINARY RESULTS
Until recently, the chronology of the marine terraces has been restricted to limited ESR dating of fossil shells within the terrace deposits, but some of these dates are considered to be underestimated, possibly as a result of fluvial reworking. To test and refine the limited existing chronology, quartz optically stimulated luminescence (OSL) dating methods are being used for the first time in this area to determine the ages of the terrace deposits.
Several OSL samples were collected from 3 marine terraces. The terrace deposits mainly consist of clays, silts, sands and gravels, and have heights ranging from 1 to 17 meters. The sediments in these deposits are mainly derived from basaltic, andesitic, and limestone geology, and have elipsoid, square and flat shapes. Field observation indicates that the marine terraces increase in height and thickness from west to east. Initial OSL results from 1 mm and 3 mm quartz aliquots demonstrate good luminescence characteristics. Preliminary equivalent dose analysis results ranging from 17.6 Gy to 64.3 Gy have been calculated using the Minimum Age Model (MAM). This study will present preliminary OSL dating results obtained from samples of Quaternary marine terrace formation.