Özet:

Oligocene sequences of Çankırı-Çorum Basin are composed of terrestrial clastic sediments between Yerköy (Yozgat) and Delice (Kırıkkae), which are laterally persistent and easily mapped owing to their reddish color. The lithologies generally consist of conglomerate, sandstone, and mudstone while evaporite levels can be seen on some parts. According to facies analyses, they generally deposited in alluvial fan, river and lake environments. The age of the unit which named as İncik Formation, Deliceırmak Formation, Kızılöz Formation and Kızılırmak Formation in previous studies is presented as Oligocene, Late Oligocene, Oligocene-Early Miocene. However vertebrate fossils, palynology and stratigraphy data point out Oligocene-Early Miocene interval, the lower and upper limits are not obvious. On the other hand, to obtain the age of uplift and cropped up of Kırşehir Massive or withdrawal of sea from Central Anatolia and tectonostratigraphic evolution of the region, in general, it is necessary to obtain the sequence and petrographic features. [1]    The Oligocene sandstones form Yozgat-Yerköy vicinity which composes the subject of this study consist of quartz, plagioclase, alkali feldspar (orthoclase, microcline), mica (muscovite, biotite), sedimentary (carbonate, chert), magmatic and metamorphic (schist) rock fragments and heavy minerals (epidote, zircon, hornblende). The units which investigated petrographically are classified on Q-F-L triangular diagrams as arkose and lithic arkose according to [1] and as arkosic arenite according to [2]. In the concept of provenance studies, the source field of sandstones is evaluated by using Qt-F-L triangular diagrams. Consequently, the main source of sandstones from Yozgat-Yerköy vicinity is located on basin uplift and transit, on arc regions.  

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