Geochemistry and U-Pb ages from the Kosdag Metavolcanics in the southern Central Pontides (Turkey): Complementary data for early Late Cretaceous island arc development in the Northern Neotethys

Date

2021-01-01

Author

BERBER, Faruk
Sayıt, Kaan
Göncüoğlu, Mehmet Cemal

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

231
views

0
downloads

The Kosdag Metavolcanics (KMs) in the southern Central Pontides are exposed between the Izmir-Ankara-Erzincan Suture Belt in the south and the Sakarya Composite Terrane in the north. They comprise an approximately 40-km-long tectonic unit, bounded by the splays of the North Anatolian Transform Fault in the north and the Kizilca Thrust in the south. The basement of the unit mainly consists of metabasalts, metaandesites, and metarhyolites, with well-developed blastomylonitic textures, which are interlayered by recrystallized pelagic limestone and chert. Late Cretaceous pelagic limestones of the Dikmen Formation disconformably overlie the basement. Geochemically, the KMs exhibit enrichment in Th and La relative to Nb (and Ti), indicating subduction-related magmatic signatures. The KMs are subdivided into two main types, as Type 1 and Type 2, based on their relative Zr-Hf enrichment/depletion features. All of the members of the KMs have a subalkaline nature (Nb/Y - 0.08-0.19 for Type 1; Nb/Y = 0.05-0.13 for Type 2) and display a calc-alkaline affinity. The high Zr/Nb (38.1-52.9 for Type 1, 21.8-41.2 for Type 2), low Zr/Y (4.07-5.25 for Type 1, 1.58-2.44 for Type 2), and Nb/Y (0.08-0.14 for Type 1,0.05-0.10 for Type 2) signatures of the KMs indicate that they have derived from a depleted source, which has been modified by a subduction component. The laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) U-Pb zircon ages of the metarhyolite samples ranged between 94.64 +/- 0.77 Ma and 113.2 +/- 2.3 Ma, suggesting the presence of an intraoceanic subduction zone during the early Late Cretaceous within the Izmir-Ankara-Erzincan branch of the Neotethys Ocean in the Central Pontides.

URI

https://hdl.handle.net/11511/88825

Journal

TURKISH JOURNAL OF EARTH SCIENCES

DOI

https://doi.org/10.3906/yer-2004-16

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

GEOCHEMISTRY AND PETROGENESIS OF THE ARC-RELATED KÖSDAĞ METAVOLCANICS, SOUTHERN CENTRAL PONTIDES, NORTHERN TURKEY Berber, Faruk; Sayıt, Kaan; Department of Geological Engineering (2021-12-27) The Kösdağ Metavolcanics (KM) in the southern Central Pontides crops out between the Izmir-Ankara-Erzincan Suture Zone (IAESZ) in the south and the Sakarya Composite Terrane in the north. The unit is represented by a low-grade metamorphic assemblage including meta-basics, meta-intermediates, and meta-felsics, interlayered with recrystallized limestone, mudstone, and chert. While the unit is bounded to the north by the North Anatolian Fault Zone (NAFZ), the Dikmen Formation stratigraphically overlie the unit...
Geochemistry, tectono-magmatic discrimination and radiolarian ages of basic extrusives within the Izmir-Ankara Suture Belt (NW Turkey): Time constraints for the neotethyan evolution Göncüoğlu, Mehmet Cemal; Tekin, U. Kagan (2006-06-01) The Dagkuplu Melange in the Central Sakarya Valley represents the northernmost outcrops of the Izmir-Ankara Suture Belt in northwest Anatolia. In addition to blocks and slivers of serpentinite, gabbro, blueschist, neritic and pelagic limestones, it includes blocks of basic volcanic rocks associated with radiolarian cherts, pelagic carbonates and mudstones.
LATE CRETACEOUS ARC AND BACK-ARC FORMATION WITHIN THE SOUTHERN NEOTETHYS: WHOLE-ROCK, TRACE ELEMENT AND Sr-Nd-Pb ISOTOPIC DATA FROM BASALTIC ROCKS OF THE YUKSEKOVA COMPLEX (MALATYA- ELAZIG, SE TURKEY) Ural, Melek; ARSLAN, MEHMET; Göncüoğlu, Mehmet Cemal; TEKİN, UĞUR KAĞAN; KÜRÜM, SEVCAN (2015-06-01) The remnants of the Southern Neotethys are represented by ophiolitic bodies and subduction/accretion complexes along the Southeast Anatolian-Zagros suture belt in the Eastern Mediterranean. Around Malatya and Elazig areas (SE Turkey), they are found within imbricated slices of a melange complex, known as the Yuksekova Complex. The studied basaltic rocks are common members of this melange complex, and show distinctive features of sources with tholeiitic to tholeiitic-transitional character. Petrography, whol...
The Arkot Dag Melange in Arac area, central Turkey: Evidence of its origin within the geodynamic evolution of the Intra-Pontide suture zone Goncuoglu, M. Cemal; Marroni, Michele; Pandolfi, Luca; Eller, Alessandro; Ottria, Giuseppe; Catanzariti, Rita; TEKİN, UĞUR KAĞAN; Sayıt, Kaan (Elsevier BV, 2014-05-01) In northern Turkey, the Intra-Pontide suture zone is represented by an east-west trending belt of deformed and/or metamorphic units located at the boundary between the Istanbul-Zonguldak terrane to the north and the Sakarya terrane to the south. These units can be regarded as issued from the Intra-Pontide domain, whose geodynamic history is still a matter of debate. Along the Akpinar-Arac-Bayramoren geotraverse, located in central Turkey, an ophiolite-bearing melange known as the Arkot Dag Melange, is well-...
Geochemistry and petrogenesis of the diabase dykes from the Boğazkale region (Çorum, Central Anatolia) Balcı, Uğur; Sayıt, Kaan; Department of Geological Engineering (2018) The Izmir-Ankara-Erzincan (IAE) Suture Belt contains oceanic and continental fragments derived from the northern branch of Neotethys and associated continental entities. In the Boğazkale region (Çorum, Central Anatolia), the pieces of Neotethyan oceanic lithosphere are present in a chaotic manner, and form an ophiolitic mélange. Diabase dykes are observed in the mélange, which cross-cut various rock types of oceanic lithosphere, such as pillow basalts, gabbros and ultramafics. This study aims to investigate...

Citation Formats

F. BERBER, K. Sayıt, and M. C. Göncüoğlu, “Geochemistry and U-Pb ages from the Kosdag Metavolcanics in the southern Central Pontides (Turkey): Complementary data for early Late Cretaceous island arc development in the Northern Neotethys,” TURKISH JOURNAL OF EARTH SCIENCES, pp. 59–80, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/88825.