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

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.


Whole rock geochemistry, Zircon U-Pb and Hf isotope systematics of the Cangaldag Pluton: Evidences for Middle Jurassic Continental Arc Magmatism in the Central Pontides, Turkey
ÇİMEN, OKAY; Göncüoğlu, Mehmet Cemal; Simonetti, Antonio; Sayıt, Kaan (2017-10-01)
The Central Pontides (Turkey) includes several igneous complexes, which are predominantly PermoCarboniferous and Middle Jurassic in age. The Cangaldag Pluton is one of the largest igneous bodies located in the northern Central Pontides, whose age and tectono-magmatic evaluation is important to constrain the geological evolution of the Northern Neotethys. The pluton tectonically overlies the cangaldag Metamorphic Complex, which represents an arc-back-arc complex of Middle Jurassic age. The Cangaldag Pluton c...
New zircon U-Pb LA-ICP-MS ages and Hf isotope data from the Central Pontides (Turkey): Geological and geodynamic constraints
ÇİMEN, OKAY; Göncüoğlu, Mehmet Cemal; Simonetti, Antonio; Sayıt, Kaan (2018-05-01)
The Central Pontides in northern Anatolia is located on the accretionary complex formed by the closure of Neotethyan Intra-Pontide Ocean between the southern Eurasian margin (Istanbul-Zonguldak Terrane) and the Cimmerian Sakarya Composite Terrane. Among other components of the oceanic lithosphere, it comprises not yet well-dated felsic igneous rocks formed in arc-basin as well as continent margin settings. In-situ U-Pb age results for zircons from the arc-basin system (tiangaldag Metamorphic Complex) and th...
ERGIN, M; OKYAR, M; TIMUR, K (Elsevier BV, 1992-02-29)
High-resolution shallow-seismic reflection (Uniboom) profiles obtained in inner and mid-shelf areas of eastern Mersin Bay (Turkey, northeastern Mediterranean) show that the sedimentary column comprises two major and distinct lithological sequences (C and B) separated by a reflector (R) which is interpreted as the pre-Holocene surface. The upper sedimentary sequence (C) is thought to represent roughly the Holocene and is characterized by parallel/divergent to sigmoidal reflection patterns above (Unit 1) and ...
Zircon ages from the Beypazari granitoid pluton (north central Turkey): tectonic implications
Speciale, Pamela A.; Catlos, Elizabeth J.; Yildiz, G. Okan; Shin, Timothy A.; Black, Karen N. (Informa UK Limited, 2012-09-01)
The Beypazari granitoid is emplaced in a Late Cretaceous volcanic arc in north central Turkey and provides evidence for processes that occurred during the closure of the Neo-Tethys Ocean. Zircons from its northern granodiorite and quartz monzonite exposure are dated in rock thin section and display characteristic igneous zoning in cathodoluminescence (CL). Its oldest Late Cretaceous ages (95.4 +/- 4.2-91.3 +/- 6.5 Ma, U-238/Pb-206, +/- 1 sigma) time early crystallization from rising melts, but inspection of...
AKIMAN, O; ERLER, A; GONCUOGLU, MC; Güleç, Nilgün Türkan; GEVEN, A; TURELI, TK; KADIOGLU, YK (1993-12-01)
The closely related assemblage of igneous and metamorphic rocks that lie within a triangular area approximately bounded by the Tuzgolu Fault, the Ecemis Fault and the Izmir-Ankara-Erzincan Suture and between the lines connecting Ankara, Sivas and Nigde is called the Central Anatolian Crystalline Complex (CACC). The granitoids cropping out within the CACC can be divided areally into three groups: (1) a large number of individual small plutons which form an arcuate set and curve from NE-SW to NW-SE and extend...
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.