Seafloor spreading structure, geochronology, and tectonic evolution of the Küre ophiolite, Turkey: A Jurassic continental backarc basin oceanic lithosphere in southern Eurasia

Abstract

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 westnorthwest-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.

The phanerozoic palaeotectonics of Turkey. Part I: an inventory

“…The placement of the cross-sections shown in Fig. 4 are indicated with black lines The sources for the ages are as follows: Alparslan and Dilek (2018), Babaie et al (2006), Bonev et al (2015a), Božović et al (2013), Çelik and Chiaradia (2008), Çelik and Chiaradia (2008), Çelik et al (2006,2011, 2013 2016), Çetinkaplan et al (2016), Chan et al (2007), Çörtük et al (2016Çörtük et al ( ), Daşçı et al (2015, Dilek and Moores (1990), Dilek and Thy (1992, 2006, 2009, Dilek et al (1999), Dimo-Lahitte et al (2001, Galoyan et al (2009), Ghazi et al (2003), Hässig et al (2013), Karamata and Lovric (1978), Karaoğlan et al (2012), Parlak et al (2010), Khalatbari-Jafari et al (2004), Koepke et al (2002), Lanphere et al (1975), Liati et al (2004), Lytwyn and Casey (1995), Mukasa and Ludden (1987) Oberhänsli et al (2012Oberhänsli et al ( , 2014; Okay and Satir (2001), Okay et al (1998Okay et al ( , 2002Okay et al ( , 2008, Okrusch et al (1978), Önen (2003), Delaloye (1996, 1999), Parlak et al (1995…”

Multi-stage Evolution of the Mehmetalan Ophiolite: Cr-Spinel Characteristics of Podiform Chromitites

“…Fig. 1 Simplified map of Anatolia (adapted from [31] and references therein) and distribution of ophiolitic rocks in the east of Lake Van [32].…”