SEDIMENTOLOGY OF CALICHE (CALCRETE) OCCURRENCES OF THE KIRŞEHİR REGION

Yıl 1998, Cilt: 120 Sayı: 120, 69 - 80, 01.01.1998

Eşref Atabey Nevbahar Atabey Haydar Kara

Öz

Study was conducted in the
Kırşehir region. Carbonate occurrences within the upper Miocene-Pliocene
deposits forming the subsidence basins surrounded by the Kırşehir massive, are
described as caliche. These caliche deposits in the alluvial fan-meandering river
and lacustrine environments are found in three different zones. In the
measured, sections, conglomerate comprises the basement and is overlain by a
transition zone made of sandy mudstone (Zone I). Above them is the rarely
nodular carbonaceous zone with horizontal and vertical positions in the reddish
mudstone-siltstone (Zone II). Finally, laminated caliche (calcrite) comprises
the upper most part (Zone III). Carbonates in the basement, country rocks, and
in the soil are dissolved in the acidic environment and become a solution
saturated with calcium bicarbonate. This solution is transported to the
sediments and capillary rises through the sediments during arid-semi arid
seasons. Carbondioxide in the Ca and HCO3 - bearing solution is removed from
the system and as a result, calcium carbonate nodules and laminated caliche are
formed. These stromatolite-like laminated caliche occurrences show a
criptoalgal structure under polarized microscope and scanning electron
microscope (SEM), and they contain microerosional surfaces and caliche
pisolites that are formed by dissolution. Caliche occurrences are believed to
be source of camotite, thorium, vanadium, sepiolite, huntite, dolomite, and
magnesite

Anahtar Kelimeler

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Kaynakça

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