DOI: 10.5593/sgem2012/s01.v1014


Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 1, 115 - 124 pp


Kaolinitic clays associated with sedimentary rocks are seen wide spreadingly in the
Yeniköy formation from Akharım district, Afyonkarahisar Province W-Anatolia.
Because of their proximity to the most ceramic industries in the area such as Kütahya
and Uşak Province of Turkey, the clays of the Akharım district have been intensively
exploited for last few years. This study has been focused on geology, geochemistry and
origin of this kaolinitic clay deposits. The Akharım clay deposits occur in the Middle-
Upper Miocene aged Yeniköy formation. Thickness of beige-gray colored clay beds
change between 0.3 and 6m, also locally appear as yellowish and brownish colours. The
origin of such yellowish and brownish levels, observed along with the joints and
bedding planes, are related to hematite and limonite minerals. Akharım clay deposit was
divided into two main parts as: Northeastern and southwestern, via a normal fault which
is the N70W/75SW in direction and dip.
Akharım clay deposits consist of mainly kaolinite as clay mineral. They also contain
biotite, quartz, feldspar, dolomite, calcite, hematite minerals in their paragenesis. Al2O3
and SiO2 contents vary 8.68-18.32 %wt and 63,64-78.98 %wt respectively. With respect
to southwestern section, northeastern part of clay deposit has lower Fe2O3 and higher Y,
La and Ce ratios. Chondrite normalized rare earth elements patterns display a slight
enrichment of light rare earth elements (LREE), depletion of heavy rare earth elements
(HREE), and negative Eu anomaly. These differential behaviors were due to the fact
that LREE components present in more leachable sites than HREE components.
Negative Eu anomaly indicates strong upper continental crust character and it has been
originated by feldspar alteration in source mostly by volcanic rocks and metamorphic
rocks. Trace element variation (e.g. Zr, Rb, Sr, Th, U, Nb, Y) in the Akharım clay
deposits provide critical information about their parent rock composition and conditions
of transportation and sedimentation. Field observations, mineralogical, and geochemical
studies indicated that Northeastern part of Akharım clay deposit developed in situ from
trachyandesitic and alkali basaltic volcanism products and that southwestern part was
formed from the weathering, transportation and deposition of weathered material in
lacustrine environment. Taşoluk and Kestel districts were the potential source areas of
sedimentary clays in SW part of deposit.

Keywords: Clay, geochemistry, provenance, Akharım, Turkey

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