Petrogenesis of Mafic Collision Zone Magmatism: The
Chemical Geology 403 (2015) 24–41 Contents lists available at ScienceDirect Chemical Geology journal homepage: www.elsevier.com/locate/chemgeo Petrogenesis of mafic collision zone magmatism: The Armenian sector of the Turkish–Iranian Plateau Iain Neill a,⁎, Khachatur Meliksetian b, Mark B. Allen a, Gevorg Navasardyan b, Klaudia Kuiper c a Department of Earth Sciences, Durham University, Science Site, DH1 3LE, Durham, UK b Institute of Geological Sciences, National Academy of Sciences of Armenia, Marshal Baghramian Avenue, Yerevan 0019, Armenia c Department of Earth Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081HV Amsterdam, Netherlands article info abstract Article history: The Turkish–Iranian Plateau grew after the Middle Miocene following the initial Paleogene Arabia–Eurasia colli- Received 30 October 2014 sion. Authors attribute uplift to break-off of the southern Neo-Tethys slab beneath the Bitlis–Zagros Suture at Received in revised form 10 March 2015 ~15–10 Ma, coupled with continued plate convergence and regional crustal shortening. Since this time there Accepted 12 March 2015 has been an upsurge in mantle-derived collision magmatism over large parts of NW Iran, Eastern Anatolia and Available online 20 March 2015 the Lesser Caucasus, potentially hundreds of kilometres from the site of southern Neo-Tethys slab break-off, N – – – Editor: K. Mezger 10 Myr after the proposed break-off event. Whole rock elemental and Sr Nd Pb Hf isotope data are presented for b3 Ma trachy-basalt to trachy-basaltic andesite lavas erupted in Armenia in the South Caucasus. Samples Keywords: formed by b5% melting of fertile subduction-modified spinel-facies lithospheric mantle, and few display elemen- Arabia–Eurasia collision tal or isotopic evidence for contamination by the 45-km thick Mesozoic–Paleogene arc crust or South Armenian Armenia Block continental crust.
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