Petrogenesis and ages of the amphibolites within the Söğüt metamorphics, Central Sakarya terrane (NW Eskişehir, Turkey)

Date

2020,

Author

Yaşar, İsmail Doğancan

Metadata

Show full item record

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

Item Usage Stats

295
views

0
downloads

The Sakarya Composite Terrane (SCT) in northern Turkey consists of a pre-Jurassic basement composed of several tectonic units. The Söğüt Metamorphics, preserved within the Central Sakarya Terrane (a part of the SCT), is one of these tectonic units, consisting of para- and ortho-gneisses associated with bands, lenses, boudins, and tectonic slices of amphibolites. Considering their field relations and petrographic features, amphibolites have fine- and coarse-grained varieties. The metamorphic conditions of amphibolites are defined by hornblende+plagioclase+biotite±sphene and epidote+chlorite+muscovite paragenesis for pro- and retro-grade phases, respectively. However, the peak metamorphic conditions (low-to-medium P/high T amphibolite facies) is defined by the sillimanite+biotite±cordierite paragenesis of the paragneisses. Geochemically, the trace element systematics of the amphibolites reveals two different chemical types for their protoliths: Type 1 amphibolites have somewhat EMORB characteristics, with negative Zr-Hf anomalies and variable enrichment in highly incompatible elements, whereas Type 2 amphibolites have subduction modified signatures with negative Nb anomalies. A continental within-plate rift setting with a metasomatized subcontinental lithospheric mantle (SCLM) source, and an intra-oceanic subduction zone setting with a mantle source metasomatized by slab-derived fluids/melts are proposed for the original crystallization setting of Type 1 and Type 2 amphibolites protoliths’, respectively. U-Pb zircon dating revealed Middle Ordovician, and Middle Carboniferous crystallization ages for the protoliths of Type 1 and 2 amphibolites, respectively. Altogether, the new data obtained confirms the opening of an oceanic basin due to within-plate rifting during the Middle Ordovician. The Middle Carboniferous magmatism, on the other hand, suggests the presence of an intra-oceanic subduction zone within this ocean.

Subject Keywords

Amphiboles., Central Sakarya Terrane, Söğüt Metamorphics, Amphibolite, Geochemistry, U-Pb Geochronology.

URI

http://etd.lib.metu.edu.tr/upload/12625507/index.pdf
https://hdl.handle.net/11511/45722

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Petrology and geochronology of the igneous rocks from the Çangaldağ metamorphic complex and the Çangaldağ pluton (Central Pontides, Turkey) Çimen, Okay; Göncüoğlu, Mehmet Cemal; Sayıt, Kaan; Department of Geological Engineering (2016) The Central Pontide Structural Complex (CPSC) in northern Turkey forms an imbricated unit that consists of a number of variable metamorphic oceanic assemblages between the Istanbul-Zonguldak and Sakarya Composite terranes. The Çangaldağ Complex comprising the Çangaldağ Metamorphic Complex and the Çangaldağ Pluton is one of the members of this body 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 Metamorphic Complex consists pred...
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...
The Tarakli Flysch in the Boyali area (Sakarya Terrane, northern Turkey): Implications for the tectonic history of the IntraPontide suture zone Catanzariti, Rita; Ellero, Alessandro; Göncüoğlu, Mehmet Cemal; Marroni, Michele; Ottria, Giuseppe; Pandolfi, Luca (2013-11-01) In the Boyali area, northern Turkey, the tectonic units of the Istanbul-Zonguldak Terrane and the IntraPontide suture zone are thrust over the deposits at the top of the Sakarya Terrane, known as Tarakli Flysch. It consists of Early Maastrichtian-Middle Paleocene turbidite and mass-gravity deposits, whose source mainly corresponds to the Istanbul-Zonguldak Terrane, and, with a lesser extent, to the IntraPontide suture zone. These deposits were sedimented in a foredeep basin developed during the convergence ...
Earthquake focal mechanism analysis of Central Anatolia Birsoy, Seda; Özacar, Atilla Arda; Department of Geological Engineering (2018) Anatolian interior is characterized by large lateral and vertical displacements and a complex tectonic history. Especially, Central Anatolia is located between escape tectonics in the east and extensional deformation in the west. The nature of this transition is still under much debate and requires detailed analysis of active tectonic stresses within the region. In this study, regional moment tensor inversion is performed for 29 earthquakes with M>3.5 recorded between 2013-2015 by a temporary broadband seis...
GEOLOGICAL AND GEOCHEMICAL EVIDENCE FOR A LATE CRETACEOUS CONTINENTAL ARC IN THE CENTRAL PONTIDES, NORTHERN TURKEY Ellero, Alessandro; Ottria, Giuseppe; Sayıt, Kaan; Catanzariti, Rita; Frassi, Chiara; Göncüoğlu, Mehmet Cemal; Marroni, Michele; Pandolfi, Luca (2015-01-01) In the Central Pontides (Northern Turkey), south of Tosya, a tectonic unit consisting of not-metamorphic volcanic rocks and overlying sedimentary succession is exposed inside a fault-bounded elongated block. It is restrained within a wide shear zone, where the Intra-Pontide suture zone, the Sakarya terrane and the Izmir-Ankara-Erzincan suture zone are juxtaposed as result of strike-slip activity of the North Anatolian shear zone. The volcanic rocks are mainly basalts and basaltic andesites (with their pyroc...

Citation Formats

İ. D. Yaşar, “Petrogenesis and ages of the amphibolites within the Söğüt metamorphics, Central Sakarya terrane (NW Eskişehir, Turkey),” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Geological Engineering., Middle East Technical University, 2020.