Stratigraphy of Eocene Sediments in the Soutwest Thrace

Year 1991, Volume: 113 Issue: 113, 15 - 29, 01.06.1991

Muhsin Sümengen İsmail Terlemez

Abstract

The area concerned is situated in the Gelibolu peninsula, north of the Saros Bay and northwest of the Marmara sea sediments of Upper Cretaceous to Miocene age, having a variety of fades crop out SW of Thrace. During the present survey, the goal was to examine the stratigraphic features of the Eocene sediments in the region. The Tertiary basin is underlain by an ophiolitic complex emplaced prior to Maastrichtian and limestone of Maastrichtian to Palaeocene age. The base of the limestone is not exposed within the region. The Tertiary transgression began in the Early Eocene in the Gelibolu peninsula. Massive mudstones, sandstone sequences that become thicker and coarser upward, and channel fill sediments are the first products of this transgression (Karaağaç limanı formation). This sequence is overlain by deltaic sediments beginning with massive mudstones and becoming thicker and coarser upward (Koyun limanı formation). These sediments are conformably and transitionally overlain by interbedded mudstone and sandstone, cut by channel fill deposits (Rcitepe formation). This formation was formed by meandering rivers. The sea that progressed inward to the Gelibolu peninsula during the Early Eocene began to become shallower again at the beginning of Lutetian and as a result, the region as a whole became a positive area during the Middle Lutetian. During the Late Lutetian, a new transgression occurred in the entire region. The first product of this transgression was a limestone (Soğucak formation). This limestone which was deposited in a shallow sea environment is locally intercalated with sandstone and conglomerate. The sea became deeper from the beginning of Upper Eocene. Firstly, turbiditic sandstone, and mudstone interbedded hemipelagic mudstone (Gaziköy formation) with tuff, and carbonate mudstone and massive mudstone (Burgaz formation) were deposited. These units are products of flat basins. These are, in turn, overlain by sequences consisting of siltstone, mudstone, and conglomerate, which become thick bedded and coarser upward (Korudağ formation) and fining upward sequences (Keşan formation). These are submarine fan deposits of turbiditic origin. The basin became shallower again towards the end of Upper Eocene. During this period, rock units made up of mudstone, siltstone, sandstone, and conglomerate were deposited. This sequence deposited in a deltaic environment has been named differently, the Kanlıbent formation in the Gelibolu peninsula and the Yenimuhacir formation between Keşan and Tekirdağ, due to its diverse local features. The basin as a whole became a continent during the Oligocene (?) and alluvial deposits that consist of mudstone, sandstone, and conglomerate formed (Armuttepe formation).

Keywords

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