tailieunhanh - Eocene-Oligocene succession at Kıyıköy (Midye) on the Black Sea coast in Thrace

A belt of Upper Eocene–Lower Oligocene marine sedimentary rocks extends from Kıyıköy on the Black Sea coast to Pınarhisar in the Thrace Basin, suggesting a marine connection between the Black Sea and the Thrace Basin during this period. The Cenozoic succession of this marine corridor was studied in the vicinity of Kıyıköy along two measured stratigraphic sections. The sequence lies unconformably over metamorphic basement rocks and consists of ~75 m of bioclastic limestone and sandstone of the Soğucak Formation, overlain by ~40 m of limestone, marl, mudstone, sandstone, and acidic tuff, which are assigned to the newly defined Servez Formation. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2020 29 139-153 http earth TÜBİTAK Research Article doi yer-1907-5 Eocene-Oligocene succession at Kıyıköy Midye on the Black Sea coast in Thrace 1 2 3 2 4 Aral I. OKAY Michael D. SIMMONS Ercan ÖZCAN Stephen STARKIE 5 6 Michael D. BIDGOOD Andrew . KYLANDER-CLARK 1 Eurasia Institute of Earth Sciences İstanbul Technical University İstanbul Turkey 2 Department of Geology Faculty of Mines İstanbul Technical University İstanbul Turkey 3 Halliburton Milton Park Abingdon United Kingdom 4 Datum Stratigraphic Associates Limited Chorltonville Manchester United Kingdom 5 GSS Geoscience Ltd. Oldmeldrum Aberdeenshire United Kingdom 6 Department of Earth Sciences University of California Santa Barbara Santa Barbara CA USA Received Accepted Published Online Final Version Abstract A belt of Upper Eocene Lower Oligocene marine sedimentary rocks extends from Kıyıköy on the Black Sea coast to Pınarhisar in the Thrace Basin suggesting a marine connection between the Black Sea and the Thrace Basin during this period. The Cenozoic succession of this marine corridor was studied in the vicinity of Kıyıköy along two measured stratigraphic sections. The sequence lies unconformably over metamorphic basement rocks and consists of 75 m of bioclastic limestone and sandstone of the Soğucak Formation overlain by 40 m of limestone marl mudstone sandstone and acidic tuff which are assigned to the newly defined Servez Formation. Larger benthic foraminifera indicate that the lower part of the succession is Late Eocene in age and nannoplankton from the upper part of the succession suggest an Early Oligocene age these age determinations are also supported by the Sr-isotope data. A U-Pb age from zircons from a tuff bed is Ma which falls on the Eocene Oligocene boundary. The Kıyıköy Upper Eocene Lower Oligocene sequence was deposited in shallow marine conditions below 50-m .