TAILIEUCHUNG - Peritectic assemblage entrainment and mafic–felsic magma interaction in the Late Oligocene–Early Miocene Karadağ Pluton in the Biga Peninsula, northwest Turkey: petrogenesis and geodynamic implications

The Hellenic subduction system governs the entire Aegean region through the creation of a migrating magmatic arc that has existed since the beginning of the Early Cenozoic. The Karadağ Pluton is situated in the NW part of Turkey and represents one of the distinct snapshots of this subduction system during the Late Oligocene-Early Miocene . It consists of 2 major lithological units, based on their petrographic and geochemical features, comprising: 1) main plutonic facies (SiO2 70 wt.%) that are represented by cordierite-free and cordierite-bearing leucogranites. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 279-312 http earth TÜBİTAK Research Article doi yer-2005-6 Peritectic assemblage entrainment and mafic felsic magma interaction in the Late Oligocene Early Miocene Karadağ Pluton in the Biga Peninsula northwest Turkey petrogenesis and geodynamic implications Namık AYSAL1 Abdullah Sinan ÖNGEN1 Sabah YILMAZ ŞAHİN1 Cem KASAPÇI1 Nurullah HANİLÇİ1 Irena PEYTCHEVA2 1 Department of Geological Engineering İstanbul University-Cerrahpaşa İstanbul Turkey 2 Geological Institute Bulgarian Academy of Sciences Sofia Bulgaria Received Accepted Published Online Final Version Abstract The Hellenic subduction system governs the entire Aegean region through the creation of a migrating magmatic arc that has existed since the beginning of the Early Cenozoic. The Karadağ Pluton is situated in the NW part of Turkey and represents one of the distinct snapshots of this subduction system during the Late Oligocene-Early Miocene . It consists of 2 major lithological units based on their petrographic and geochemical features comprising 1 main plutonic facies SiO2 lt 70 wt. that are dominated by hornblende- and biotite-bearing monzogranite quartz monzonite and granodiorite and 2 late-stage more felsic facies SiO2 gt 70 wt. that are represented by cordierite-free and cordierite-bearing leucogranites. Zircon U-Pb laser ablation inductively-coupled plasma mass spectrometry and K-Ar dating revealed crystallization and cooling ages of Ma and Ma for the main plutonic bodies and Ma for the leucogranite facies respectively. The pluton had a high-K calc-alkaline affinity and exhibited a metaluminous to peraluminous aluminum saturation index of AYSAL et al. Turkish J Earth Sci cording to some studies crystals and melts may separate Delaloye and Bingöl 2000 Köprübaşı and Aldanmaz 2004 from the parental magma by the separation of entrained .

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• Peritectic entrainment assemblage
• Magma mixing
• U/Pb and K Ar dating
• Mantle crust interaction
• Biga Peninsula
• Sakarya Zone
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• Radioactive elements in Dong Pao deposit
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• Light rare earth elements
• metamorphism
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