Petrological Relations of Orthoamphibolite and Metagabro: North to Himmetli Village (Niğde)

Hüseyin KURT, Kerim KOÇAK, Kürşat ASAN, Yusuf Kağan KADIOĞLU, Mustafa KARAKAŞ

Abstract


This study aimed to find out the mineralogical, geochemical and petrological
characteristics of orthoamphibolites of the basement, and intruding metagabbros exposed in northeast to
Niğde. Orthoamphibolites are made up of actinolites, magnesiohornblendes and tschermakite while
intruding metagabbros are composed mostly of basic plagioclase (An73-91), diopside (Wo45 En42 Fs12) and
enstatite (Wo1 En70 Fs29) minerals. Geochemical diagrams show that tholeiitic amphibolites typically
represent back-arc basalts while the metagabbros do tholeiitic island-arc basalts. Geological and
geochemical data indicate that olivine and/or pyroxene fractional crystallisation played an important
role in petrological evolution of the samples, in contrast plagioclase remained in the melt.


Keywords


Amphibolite; metagabbro; island-arc basalt; back-arc basalt; Niğde massive.

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