The Küre ophiolite in the Sakarya terrane in northern Anatolia is a Penrose-type ophiolite, complete with a sheeted dike complex, and includes well-developed volcanogenic massive sulfide deposits. It is tectonically imbricated along south-directed thrust faults between the Paleozoic, continental basement rocks of the Devrekani Massif (Eurasia) to the north and the Late Triassic–Early Cretaceous subduction-accretion complexes (Tethys) to the south. The ∼5-km-thick crustal lithologies in the ophiolite are crosscut by west-northwest–east-southeast–oriented, extensional ductile-brittle shear zones and normal faults that display hydrothermal mineralization and seafloor alteration effects. The west-northwest–east-southeast–striking sheeted dikes and these extensional fault systems indicate a north-northeast–south-southwest seafloor spreading direction during the magmatic evolution of the ophiolite. The U-Pb zircon dating of a gabbroic rock has revealed a concordant age of 168.8 ± 2 Ma that represents the timing of the igneous construction of the ophiolite. Sandstone units in the ∼3-km-thick turbiditic sedimentary cover of the ophiolite contain Paleoarchean, Neoarchean, and Proterozoic detrital zircons, derived from the Ukrainian shield and the East European Platform, indicating a proximal position of the Küre basin to Eurasia during its development. The Küre ophiolite represents a Middle Jurassic continental backarc basin ophiolite with a Eurasian affinity.
Seafloor spreading structure, geochronology, and tectonic evolution of the Küre ophiolite, Turkey: A Jurassic continental backarc basin oceanic lithosphere in southern Eurasia
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Gözde Alparslan, Yildirim Dilek; Seafloor spreading structure, geochronology, and tectonic evolution of the Küre ophiolite, Turkey: A Jurassic continental backarc basin oceanic lithosphere in southern Eurasia. Lithosphere doi: https://doi.org/10.1130/L641.1
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