Microfacies analysis of upper devonian - lower carboniferous shallow water carbonates of the yilanli formation in Zonguldak area, North Western, Turkey

Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Geological Engineering, Turkey

Approval Date: 2016




The Yılanlı Formation of Upper Devonian to Lower Carboniferous succession of the Zonguldak region were measured from Gökgöl section near Zonguldak city, NW Turkey. The studied section dominantly consists of limestone of grey – dark grey color with thin to thick beds of black shale and claystone. A variety of lithofacies identified in the studied section including limestone, dolomite, shale, claystone and mudstone. Nine microfacies are identified as grainstone, packstone, wackstone, mudstone, bindstone, rudstone, shale, claystone and dolomite. Grainstone and packstone have abundant peloids, bioclast, intraclast and ooids. Wackstone and mudstone are characterized by bivalves, ostracods, lamination and breccia. The model for carbonate microfacies are generated by using texture, modal and spatial parameters in context of component analysis to interpret depositional environment. The depositional environment is interpreted as shallow marine sub-tidal to shallow lagoon environment of inner ramp type carbonate platform. The Yılanlı Formation is characterized by variety of fauna like ostracods, foraminifera, bivalves, gastropods, echinoderms, sponges, corals and green algae in the studied section.