Van gölü (Türkiye) doğu akbulak köyü çevresinde maruz kaldığı permiyen karbonatların foraminiferal biyotratigrafisi ve mikrofasıy analizi

This study aims to delineate the biostratigraphic, sedimentologic, stratigraphic characteristics, and sequence stratigraphic analysis of the Permian units of the Yamanyurt Formation in Eastern Anatolia around Akbulak village (Muradiye, Van). For this purpose, an approximately 51 m thick section of the Permian Yamanyurt Formation was measured, and 44 samples have been studied in detail. The studied samples have yielded foraminiferal assemblage comprising the species of Climacammina, Dunbarula, Eopolydiexodina, Eotuberitina, Globivalvulina, Glomomidiella, Multidiscus, Nankinella, Neodiscus, Neodiscopsis?, Pachyphloia, Parafusulina, Protonodosaria?, Pseudolangella. Based on these foraminiferal assemblages, the studied unit is assigned to the Middle Permian. Initially aged to the Triassic, these limestone unit have been reassigned to the Wordian-Capitanian (Middle Permian) based on the defined foraminiferal species. To understand the depositional history and define the sequence stratigraphic outline of the studied section, detailed microfacies studies have been carried out, and seven different microfacies types characterizing backshoal, shoal, and foreshoal environments have been identified. These defined microfacies types involve bioclastic wackestone, bioclastic grainstone, intra-bioclastic grainstone, intra-bioclastic packstone- grainstone, bioclastic packstone, bioclastic wackestone-packstone, and coated bioclastic grainstone. Based on the vertical stacking patterns of defined microfacies types, the sequence stratigraphic framework has been constructed in the studied section involving a set of transgressive and highstand systems tracts. The transgressive systems tract is mainly distinct by shoal and foreshoal facies, while the highstand systems tract is mostly characterized by shoal and backshoal facies.