Geochemical constraints on the genesis of the Günyüzü pluton, northwest Anatolia, Turkey

Kibici Y., İLBEYLİ N., Yildiz A., Bagci M.

International Geology Review, vol.50, no.10, pp.931-947, 2008 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 10
  • Publication Date: 2008
  • Doi Number: 10.2747/0020-6814.50.10.931
  • Journal Name: International Geology Review
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.931-947
  • Hatay Mustafa Kemal University Affiliated: No

Abstract

The Tavsanli Zone in northwest Turkey is intruded by many Late Cretaceous to Eocene (91-45 Ma) calc-alkaline granitoids, of which the Günyüzü pluton in the Eskisehir region is the least studied. The Günyüzü rocks are high-K, calc-alkaline (I-type) intrusions, and are comprised of diorite, granodiorite, granite, and granite porphyry. Typical minerals are plagioclase, K-feldspar, quartz, biotite, hornblende and Fe-Ti oxides. Chondrite-normalized REE patterns for the Günyüzü rocks are moderately fractionated and have small negative Eu anomalies. They are enriched in LILE and LREE relative to HFSE, showing characteristics of arc-related granitoids. Low values of molar K2O/Na2O, Al2O3/(FeO+MgO+TiO2), and (Na2O+K2O)/(FeO+MgO+TiO2) ratios demonstrate that the Günyüzü magma(s) were produced from mafic lower crustal rocks. Copyright © 2008 by Bellwether Publishing, Ltd. All rights reserved.