Zircon U Pb Geochronology Hf Isotopes and whole rock geochemistry of the meta magmatic rocks from the Çangaldağ Complex Central Pontides Turkey

2016-04-11
Çimen, Okay
Göncüoğlu, Mehmet Cemal
Simonetti, Antonio
Sayıt, Kaan
The Central Pontides in northern Turkey form an imbricated structural complex that consists of a number of variably metamorphic oceanic assemblages between the Istanbul-Zonguldak and Sakarya Composite terranes. The Çangaldağ Complex is a member of this unit and occurs as an E-W trending 30 km long and 15 km wide belt to the north of the Kastamonu-Boyabat Tertiary basin. The Çangaldağ Complex consists predominantly of variably deformed and metamorphosed igneous rocks ranging from felsic to mafic in composition, and plays an important role in deciphering the geodynamic evolution of the Central Pontides. The main magmatic lithologies are basalt, tuff, diabase, gabbro, andesite and rhyodacite. The mafic and intermediate rocks were mainly subjected to greenschist facies metamorphism as evidenced by the assemblage of ab+act+chl+ep. The slightly metamorphic felsic phases exhibit porphyritic textures with quartz and feldspar phenocrysts surrounded by a fine-grained groundmass. Geochemically, all magmatic rocks display the typical features of subduction-related magmas as evidenced by variable enrichment in LREE over HFSE. In-situ U-Pb geochronological results for zircons from three different meta-rhyodacite samples yield Middle Jurassic ages between 156.2 ± 2.9 Ma and 176.4 ± 5.9 Ma. Additionally, in-situ 176 Hf/ 177 Hf initial ratios (between 0.28284 ± 0.00004 and 0.28275 ± 0.00004) on the same zircons correspond to T DM model ages between 607 and 678 Ma, which suggest melting of Neoproterozoic crustal lithologies for the generation of magmatic rocks within the Çangaldağ Complex. Overall, the geochemical and geochronological data confirm the presence of an island-arc system during the Middle Jurassic period. It is further suggested that the meta-magmatic rocks of the Çangaldağ Complex have been generated by intra-oceanic subduction within the Intra-Pontide Ocean. Note: This abstract was supported by TUBITAK. The project number is 144Y422.

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Citation Formats
O. Çimen, M. C. Göncüoğlu, A. Simonetti, and K. Sayıt, “Zircon U Pb Geochronology Hf Isotopes and whole rock geochemistry of the meta magmatic rocks from the Çangaldağ Complex Central Pontides Turkey,” presented at the 69. Türkiye Jeoloji Kurultayı (11 - 15 Nisan 2016), Türkiye, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/71938.