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2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

Paper No. 312-5
Presentation Time: 9:00 AM-6:30 PM

OPTICALLY STIMULATED LUMINESCENCE AND QUATERNARY STRATIGRAPHY OF MARINE TERRACES BETWEEN TRABZON AND RIZE, EASTERN BLACK SEA BASIN, TURKEY: PRELIMINARY RESULTS


SOFTA, Mustafa1, SPENCER, Joel Q.G.2, EMRE, Tahir3, SÖZBILIR, Hasan3 and TURAN, Mehmet4, (1)Department of Geology, Dokuz Eylul University, Izmir, 35397, Turkey; Department of Geology, Kansas State University, Manhattan, KS 66506, (2)Department of Geology, Kansas State University, Manhattan, KS 66506, (3)Department of Geology, Dokuz Eylul University, Izmir, 35397, Turkey, (4)Department of Geology, Karadeniz Technical University, Trabzon, 61080, Turkey, joelspen@ksu.edu

The coastal region of the Pontides in northeastern Turkey preserves a rich history of Quaternary marine terraces. The emerged sequence of marine terraces between the cities of Trabzon and Rize, Turkey, lie on the northern zone of the Eastern Pontides orogenic belt in a context of plate collision. The sequence of paleoshorelines is impressive, with individual shorelines increasing in altitude from a few meters up to hundred meters across the study region.

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.

Session No. 312--Booth# 399

T189. New Applications of Geochronologic Techniques to Quaternary and Archaeological Settings (Posters)
Wednesday, 4 November 2015: 9:00 AM-6:30 PM
Exhibit Hall (Baltimore Convention Center)
Geological Society of America Abstracts with Programs. Vol. 47, No. 7, p.792
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