Geochemical characteristics of the Sebinkarahisar granitoids in the Eastern Pontides, northeast Turkey: Petrogenesis and tectonic implications
INTERNATIONAL GEOLOGY REVIEW, vol.50, no.6, pp.563-582, 2008 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 50 Issue: 6
- Publication Date: 2008
- Doi Number: 10.2747/0020-6814.50.6.563
- Journal Name: INTERNATIONAL GEOLOGY REVIEW
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.563-582
- Akdeniz University Affiliated: No
Abstract
A series of Cretaceous to Eocene granitoids are present in the Eastern Pontides of northeastern Turkey. The Asarcik (Saplica, Catakhan), Eskine, and Saydere (Sebinkarahisar-Giresun) are the least-studied, thus least-understood plutons in the orogen. Rock assemblages range from monzonite to granite. They contain mainly K-feldspar, plagioclase, quartz, hornblende, biotite, and Fe-Ti oxides. They are high-K, calc-alkaline, and I-type granites. Chondrite-normalized REE patterns are fractionated and have small negative Eu anomalies. They show enrichment in LILE and LREE relative to HFSE, displaying features of arc-related granitoids. Low molar Al2O3/(FeO+MgO+TiO2) in combination with variable molar (Na2O+K2O)/(FeO+MgO+TiO2) ratios indicate that the magmas were derived from mafic lower-crustal source rocks. The Eu and Sr anomalies and unfractionated HREE Suggest the presence of plagioclase and absence of garnet in the source.