Jeoloji Münendisliği Dergisi

Geochemistry and Genetic Interpretation of the Çelebi Instrusion in the Inner Anatolian Granitoid Belt

ABSTRACT: The limer Anatolian granitoid belt is situated at the western, proximity of the Kırşehir Massif.. Forty samples of Çelebi granitoid, which contantes one of `the intrusions in the belt., were analysed for major and trace elements. The geochemical proper- `lies and the origin of the intrusion -arc discussed. Principal daik colored minerals of the granitoids in dhe area studied which have granitic, granodioritic qiiartzmonzonMc, quartzmonzodioritic composition and! calc-alk aline character, consist of homblend •+• biotite ± clinopyroxene and titanite.. These- instrosions contain abundant residual rock inclusions of similar minéralogie composition, and are- of I-type granitoid character. They have a high concentration of K.,, Rb, Sr, Ba, Zr, Nb, .Tht U`,, Rb/Sr,. and a low concentration of K/Rb and Sr/B-a.. It can be claimed, that the Çelebi granitoid, which shows similarities to volcanic .arc and post-collision granitoids in terms of the content of certain trace elements,,, is formed through partial melting of the continental crast ± mantel material,, basing on. its imneralogical- petrographical and geochemical properties.