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.
69. Türkiye Jeoloji Kurultayı (11 - 15 Nisan 2016)


Whole rock geochemistry zircon U Pb geochronology and Lu Hf isotope systematics of the Çangaldağ Pluton Central Pontides Turkey
Çimen, Okay; Göncüoğlu, Mehmet Cemal; Sayıt, Kaan; Simonetti, Antonio (2016-04-11)
The Central Pontides include several granitoid complexes, which are predominantly PermoCarboniferous and Middle Jurassic in age. Currently, there is no geochemical and radiometric age data from one of the largest igneous bodies, namely the Çangaldağ Pluton to the northeast of the Çangaldağ Complex. The pluton intrudes the Çangaldağ Volcanic Complex and mainly comprises non-metamorphic diorite, dacite porphyry, and lesser amount of granitic rocks. The dioritic rocks are surrounded by dacite porphyries, which...
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...
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...
New age data from the tectonostratigraphic units of the Istranca "Massif" in NW Turkey: a correlation with SE Bulgaria
Bedi, Yavuz; Vasilev, Emil; Dabovski, Christo; Ergen, Ali; OKUYUCU, CENGİZ; Dogan, Adil; TEKİN, UĞUR KAĞAN; Ivanova, Daria; Boncheva, Iliana; Lakova, Iskra; Sachanski, Valeri; Kuscu, Ismail; Tuncay, Ercan; Demiray, D. Gulnur; Soycan, Havva; Göncüoğlu, Mehmet Cemal (2013-8-01)
The Istranca Crystalline Complex in NW Anatolia and SE Bulgaria includes structural units that differ in lithostratigraphy, metamorphism, age and structural position. They are collectively named as the "Istranca nappes" comprising from bottom to top the Sarpdere, Mahyadag. and Dogankoy Nappes. The Sarpdere Nappe consists of Lower Triassic arkosic metasandstones with slate interlayers, followed by Middle to Upper Triassic carbonates and an alternation of Upper Triassic clastics and carbonates. The Mahyada. g...
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.