Geology and Origin of Clay Deposits at Orta (Çankırı) Area

Yıl 1991, Cilt: 113 Sayı: 113, 87 - 92, 01.06.1991

Asuman G. Türkmenoğlu Orhan Akıman Serdar Aker Ayla Tankut

Öz

Kaolinitic clay layers interbedded with lignite seams are observed in the Orta (Çankırı) area. In order to reveal the genesis
of these clays, geological, mineralogical, petrographical and micromorphological studies were carried out in the vicinity of the clay deposits
and in their surrounding country rocks. Rock samples were examined by means of optical microscope, X-ray powder diffractometer and
scanning electron microscope. Kaolinitic clays were formed in the clayey and silly Orta formation of Pliocene age. These elastics were transported
and deposited by streams in a lacustrine environment located on a paleotopographic depression. The country rocks providing detritic
materials which mainly consist of smectite comprise pyroclastic rocks (Kepezinkaş, formation) and lava flows (Naltepe basalt). In addition to
this, some data indicating the development of smectite related to the authigenic processes were also obtained. It is concluded that the clay
layers were formed by the transformation of smectite to kaolinite in an acid swamp environment. 

Anahtar Kelimeler

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Kaynakça

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