Revised Chrono-biostratigraphy of Lower Miocene deposits of the Eastern Mediterranean (SW Turkey), based on calcareous nannofossils

Gülin Yavuzlar,Enis Kemal Sagular

doi:10.4154/gc.2018.15

Abstract

Lower Miocene deposits of the Guneyce Formation formerly described as the Elmali Formation of Lutetian-Burdigalian age are located near the villages of Gokcebag (Burdur) and Yakaoren (Isparta), (southwestern Turkey), Eastern Mediterranean, and overlie the pre-Neogene tectonostratigraphic units of the Isparta Angle. The purpose of this study is to discuss new biostratigraphic data calibrated to originally classified nannofossil records. Three Early Miocene nannofossil biozones,NN1 - Triquetrorhabdulus carinatus Zone, NN2 - Discoaster druggii Zone and NN3 – Sphenolithusbelemnos Zone, were defined in clastic sediments of the Guneyce Formation. In addition, one Lutetianbio zone, NP16 – Discoaster tanii nodifer Zone, was recognized in the remaining outcrops of the Isparta Formation unconformably underlying the Guneyce Formation. Nannofossil assemblages of shallow marine deposits in the Guneyce Formation contain high amounts of reworked (Palaeogene and Cretaceous) specimens. New biostratigraphic data and sedimentary features of the Guneyce Formation clastics indicate shallow marine deposition and the beginning of the transgression, spreading over an erosional surface on the ophiolitic melangeand Cretaceous to Eocene marine successions rising to the west of the region.

Highlights

The Cretaceous to Neogene marine successions are in the northern, western and eastern parts of the Isparta Angle
In previous studies the marine clastics and the carbonate rock series of the studied area were mainly described as Eocene flysch by GUTNIC et al (1979), the Kayıköy Formation (Eocene) by YAĞMURLU (1994), Isparta flysch (Eocene) by GÖRMÜŞ & ÖZKUL (1995), the Elmalı Formation (Lutetian to Burdigalian) by ŞENEL (1997) and Yavuz Flysch (Eocene) by POISSON et al (2003)
Clastic and carbonaceous deposits, belonging to the Güneyce Formation in the studied area, were interpreted by BARRIER & VRIELYNCK (2008) as the Derinçay Formation corresponding to platform or shallow shelf carbonate or terrigenous clastics, deposited at the back-arc basin or on the low-land margin of the active subduction zone placed in the Eastern Mediterranean Basin

Summary

Introduction

The Cretaceous to Neogene marine successions are in the northern, western and eastern parts of the Isparta Angle. In previous studies the marine clastics and the carbonate rock series of the studied area were mainly described as Eocene flysch by GUTNIC et al (1979), the Kayıköy Formation (Eocene) by YAĞMURLU (1994), Isparta flysch (Eocene) by GÖRMÜŞ & ÖZKUL (1995), the Elmalı Formation (Lutetian to Burdigalian) by ŞENEL (1997) and Yavuz Flysch (Eocene) by POISSON et al (2003). The proposed new Lower Miocene marine clastics of the Güneyce Formation, which extend in the northern part of the Isparta Angle, are significant for the Eastern Mediterranean geology

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Conclusion