MINERALOGICAL AND GEOCHEMICAL CHARACTERISTICS AND GENESIS OF THE SEPIOLITE DEPOSITS AT POLATLI BASIN (ANKARA, TURKEY)


Karakaya M. C. , KARAKAYA N., TEMEL A.

CLAYS AND CLAY MINERALS, cilt.59, sa.3, ss.286-314, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 59 Konu: 3
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1346/ccmn.2011.0590306
  • Dergi Adı: CLAYS AND CLAY MINERALS
  • Sayfa Sayıları: ss.286-314

Özet

The Middle-Upper Miocene-Pliocene sediments near Polatli contain commercial sepiolitic clay deposits. The sepiolite-rich Polatli basin sediments were studied to describe the sepiolitic clay deposits of the area and to assess the environments of formation using X-ray diffraction, optical and scanning electron microscopy, and chemical analysis. The Polatli basin is an elongated, rift-related graben trending NE-SW in central Turkey, filled with continental Late Miocene to Early Pliocene sediments. The sediments which comprise claystone, marl and limestone, dolostone, and evaporites are characteristic deposits of low-salinity, playa-lake depositional environments. These sepiolite-rich deposits include sepiolite, dolomite, and calcite, with minor amounts of palygorskite, quartz, moganite, amorphous silica (opal-CT), and feldspar.