DBPapers
DOI: 10.5593/sgem2012/s01.v1007

GEOCHEMICAL AND GEOCHRONOLOGICAL (Rb/Sr) PROPERTIES OF THE GÜNYÜZÜ GRANITOID (SİVRİHİSAR, ESKİŞEHİR)

BAGCI M., ILBEYLI N., YILDIZ A., KIBICI Y., DEMIRBILEK M,
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, 47 - 56 pp

ABSTRACT

The Günyüzü rocks are located to SE of the Tavşanlı zone and trend NW-SE. They are
composed of granite, granodiorite and granite porphyry. They are metaluminousperaluminous,
medium- to high-K calc-alkaline (I- and S-types) intrusions. The Rb-Sr
dating method for the Günyüzü granites indicates Middle-Late Eocene ages (47.0±1.0 to
40.8±3.0 Ma). Initial values of 87Sr/86Sr in the granites are between 0.70667 and
0.70620. Low values of molar K2O/Na2O, Al2O3/(FeO+MgO+TiO2) and
(Na2O+K2O)/(FeO+MgO+TiO2) ratios show that the magma(s) in thes zone could be
derived from lower crustal rocks.

Keywords: Günyüzü Granitoid, Rb/Sr isochron age, Sivrihisar, Eskişehir

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