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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

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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 Period.iod. 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 journals.tubitak.gov.tr earth TÜBİTAK Research Article doi 10.3906 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 04.05.2020 Accepted Published Online 04.11.2020 Final Version 22.03.2021 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 Period.iod. 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 23.9 0.5 Ma and 20.2 0.9 Ma for the main plutonic bodies and 22.0 1.1 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 .