Geodynamic Significance of the Early Triassic Karaburun Granitoid (Western Turkey) for the Opening History of Neo-Tethys

Authors : Cüneyt AKAL, O Ersin KORALAY, Osman CANDAN

Pages : 255-271

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The Karaburun Peninsula, which is considered part of the Anatolide-Tauride Block of Turkey, contains clastic and carbonate sequences deposited on the northern margin of Gondwana. The Palaeozoic clastic sequence, which is intruded by the Early Triassic granitoid and tectonically overlies a Mesozoic mélange sequence, can be divided into three subunits: a lower clastic subunit consisting of a sandstone-shale alternation, an upper clastic subunit consisting of black chert-bearing shales, sandstone and conglomerate, and a Permo-Carboniferous carbonate subunit. The lower Triassic Karaburun I-type granitoid has a high initial 87Sr/86Sr ratio insert ignore into journalissuearticles values(0.709021-0.709168);, and low 143Nd/144Nd ratio insert ignore into journalissuearticles values(0.512004-0.512023); and eNd insert ignore into journalissuearticles values(-5.34 to -5.70); isotopic values. Geochronological data indicate a crystallization insert ignore into journalissuearticles values(intrusion); age of 247.1±2.0 Ma insert ignore into journalissuearticles values(Scythian);. Geochemically, the acidic magmatism reflects a subduction-related continental-arc basin tectonic setting, which can be linked to the opening of the northern branch of Neo-Tethys as a continental back-arc rifting basin on the northern margin of Gondwana. This can be related to the closure through southward subduction of the Palaeotethys Ocean beneath Gondwana.
Keywords : Karaburun, Neo Tethys, Palaeo Tethys, diorite, Triassic, magmatism