TAHAR-GÜZELÖZ (NEVŞEHİR) GEÇ MİYOSEN-ERKEN PLİYOSEN YAŞLI DİYATOMİTLERİNİN DİYATOM İÇERİĞİ VE PALEOEKOLOJİK ÖZELLİKLERİ

Nevşehir ili, Tahar ve Güzelöz yörelerinde geç Miyosen-erken Pliyosen yaşlı volkanosedimenter birimler içerisinde yeralan diyatomitlerden biri Tahar yöresinde (geç Miyosen yaşlı Ürgüp Formasyonu'nun Bayramhacılı Üyesi içerisinde), ikisi Güzelöz yöresinde (erken Pliyosen yaşlı Ürgüp Formasyonu'nun Kışladağ Üyesi içerisinde) olmak üzere ölçülen stratigrafık kesitlerden 21 diyatom cinsine ait 73 tür tanımlanmıştır. Tanımlanan diyatom cins ve türlerinin 20 mikroskobik slayt alandaki bolluk dağılımları dikkate alınarak, inceleme alanındaki diyatomitlerin paleoekolojik özellikleri yorumlandığında; her üç lokasyonda diyatomitlerin oluşumu sırasında göl suyunun nötr ve asit özellik gösterdiği, Tahar ve Güzelöz–2 lokalitelerinde diyatomitlerin oluşumu sırasında göl suyunun tatlı su özelliğinde olduğu, Güzelöz–1 lokalitesinde ise tatlı su özelliğinde başlayıp, tavana doğru acı su özelliğine dönüştüğü, Tahar lokalitesinde (geç Miyosen); göldeki su seviyesinin ve su sıcaklığının yüksek olduğu, göl tabanında çamur bulunduğu, göl suyunun besin oranının başlangıçta düşük-orta başlayıp, tavana doğru ise arttığını, göl suyunun oksijen oranının başlangıçta yüksek, daha sonra orta seviyede bulunduğu, Güzelöz–1 (erken Pliyosen) lokalitesinde; göldeki su seviyesinin ve besin oranının değişken olduğu, göl tabanınında bitkilerin bulunduğu, su sıcaklığının başlangıçta düşük, daha sonra yüksek olduğunu, göl suyunun oksijen oranının başlangıçta yüksek, daha sonra orta seviyede bulunduğu, Güzelöz–2 (erken Pliyosen) lokalitesinde; göldeki su seviyesinin, su sıcaklığının ve besin oranının yüksek olduğu belirlenmiştir.

Anahtar Kelimeler:

Diyatomit, geç Miyosen-erken Pliyosen, Güzelöz, Paleoekoloji, Tahar

DIATOM CONTENT AND PALAEOECOLOGICAL CHARACTERISTICS OF LATE MIOCENE-EARLY PLIOCENE AGED DIATOMITES IN TAHAR-GÜZELÖZ (NEVŞEHİR)

Seventy-three species of 21 different diatom genera were identified from three stratigraphic sections which are located in the late Miocene-early Pliocene volcanosedimentary units in Tahar and Güzelöz (Nevşehir) areas. One of these sections was measured in the Tahar area (in the late Miocene age Bayramhacılı Member of Ürgüp Formation), and the two sections were measured in the Güzelöz area (early Pliocene age Kışladağ Member of Ürgüp Formation). When evaluated of the investigated area diatomite’s palaeoecological properties by considering the distribution of numerical values (in 20 microscopic slide area) of the determined diatom genus and species; It have been determined that, when the formation of the diatomite at all three locations, the lake water has neutral and acid properties. At the Tahar and Güzelöz-2 locations the lake water was fresh water feature, also, in the Güzelöz-1 location the lake water was initially as fresh water feature and than changed to bitter water character towards to top of the section. At the Tahar location (late Miocene); lake water’s level and temperature was high, the bottom of the lake was muddy. The nutrient ratio of lake water was initially low-moderate, later increased towards to top of the section. Lake water's oxygen ratio was initially high, later in the middle level. At the Güzelöz–1 location (early Pliocene); lake water’s level and nutrient was variable. There were plants at the bottom of the lake. Lake water's oxygen ratio was initially high, later in the middle level. The lake water’s temperature ratio was initially low, later increased towards to top of the section. Also, lake water's oxygen ratio was initially high, later in the middle level. At the Güzelöz-2 location; lake water’s level, temperature and nutrient was high.

Keywords:

Diatomite, Güzelöz, late Miocene-early Pliocene, Palaeoenvironment, Tahar,

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