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

Date

2017-10-01

Author

ÇİMEN, OKAY
Göncüoğlu, Mehmet Cemal
Simonetti, Antonio
Sayıt, Kaan

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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 consists mainly of non metamorphic gabbroic diorite, dacite porphyry, and lesser amount of granitic rocks. Geochemically, the various rock types are akin to volcanic arc magmas displaying Th/Nb and light rare earth element/heavy rare earth element enrichments. In-situ U-Pb age results of zircons from dacite porphyry and granite samples yield ages of 161 +/- 5 Ma and 170 +/- 2 Ma, respectively. Corresponding in-situ average Hf-176/Hf-177 initial ratios are 0.28287 +/- 0.00004 and 0.28213 +/- 0.00002 for the dacite porphyry and granite samples, respectively. These results are consistent with derivation from a subduction-modified mantle source. Based on Hf isotope compositions, TOM model ages vary between 624 and 1512 Ma and suggest that the arc magmatism associated with the cangaldag Pluton may have involved partial melting of Neoproterozoic/Mesoproterozoic crustal rocks, a common feature in Gondwana-derived terranes. The geochemical, Hf isotope, and geochronological data reported here confirm the presence of a continental arc system during the Middle Jurassic in the Central Pontides, and suggests that the cangaldag Pluton formed during northward subduction of the Intra-Pontide branch of the Northern Neotethys.

Subject Keywords

Cangaldag pluton, Central pontides, Geochemistry , Geochronology, Intra-Pontide

URI

https://hdl.handle.net/11511/31062

Journal

LITHOS

DOI

https://doi.org/10.1016/j.lithos.2017.06.020

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Graduate School of Natural and Applied Sciences, Article

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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 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 (2016-04-11) 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 compositi...
Geochemistry of the metavolcanic rocks from the Cangaldag Complex in the Central Pontides: implications for the Middle Jurassic arc-back-arc system in the Neotethyan Intra-Pontide Ocean Cimen, Okay; Göncüoğlu, Mehmet Cemal; Sayıt, Kaan (2016-01-01) The Cangaldag Complex in northern central Turkey is one of the main tectonic units of the Central Pontide Structural Complex that represents the remains of the poorly known Intra-Pontide branch of the Neotethys. It comprises low-grade metamorphic rocks of intrusive, extrusive, and volcaniclastic origin displaying a wide range of felsic to mafic compositions. Petrographically the complex consists of basalts-andesites-rhyodacites and tuffs with minor amount of gabbros and diabases. On the basis of geochemistr...
Upper Cretaceous volcaniclastic complexes and calcareous plankton biostratigraphy in the Western Pontides, NW Turkey Boehm, Katharina; Wagreich, Michael; Wolfgring, Erik; Tuysuz, Okan; Gier, Susanne; Yılmaz, İsmail Ömer (2019-01-01) This study describes and interprets Upper Cretaceous volcaniclastics interbedded with hemipelagic to pelagic limestones, marls, and turbidites from the Western Pontides, northwestern Turkey. The Derekey Formation, the Unaz Formation (red pelagic limestone unit), and the Cambu Formation can be distinguished, overlain by the turbiditic Akveren Formation. Biostratigraphic ages from the predominantly volcaniclastic Derekoy Formation indicate Turonian (Dicarinella concavata planktonic foraminifera zone, CC13/UC8...
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...

Citation Formats

O. ÇİMEN, M. C. Göncüoğlu, A. Simonetti, and K. Sayıt, “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,” LITHOS, pp. 136–156, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31062.