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GENERAL ASPECT OF DIFFERENT BARITE OCCURRENCES IN THE EAST OF ISTANBUL, TURKEY

AUTHOR/S: M. MARAL, D. MARAL, T. A. KEPEKLI, A. CELENLI, E. HACIOGLU, M. BUDAKOGLU, S. SEZER, S. KILINCARSLAN, F. SUNER
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 17-22 pp

ABSTRACT

Barite occurrences east of Istanbul (NW Turkey) are compared major mineralogical and
geochemical properties, and identified depositional origins. Sile barite occurrence,
which is near Blacksea, north east of Istanbul, is alternated with Triassic sandstone.
Petrographic observations reveal that barite grains are found out in the sand stones.
Chemical analyses are conducted on eighteen samples via AAS (Atomic Absorption
Spectroscopy) equipment for detection of Cu, Zn, Pb, Sr, Cd and Ni concentrations.
Because of a vein shape, the occurrence is evaluated as a hydrothermal origin. However,
microscopic studies, low Pb, Zn and Sr concentration and the presence of arkose show
that the barite is formed by sedimentary.

Gebze barite occurrence is near Marmara Sea south east of Istanbul. Barite is located in
the weakness zone between Silurian - Lower Devonian limestones and Lower Devonian
fossiliferous shales as a vein or veinlet. This type of barite is considered that is formed
under the control of hydrothermal solutions and barium rich circulation fluids.
Microscopic investigations show that coarse grain barite crystals are intersected with
micro barite fractures. Geochemical investigations are performed on nine samples for
detected to the trace element (Cu, Zn, Pb, Sr, Cd and Ni) concentrations via AAS
(Atomic Absorption Spectroscopy) equipment. Due to higher than 1.5-2% Sr/SrSO4
ratios, irregular Pb, Zn, Cu and Ni concentrations in barite and host rock with Ba and Sr
contents support hydrothermal presence in the mineralization.

Keywords: barite, geochemistry, mineralogy, Sile, Gebze

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