TAILIEUCHUNG - Dating subduction events in East Anatolia, Turkey

Metamorphic studies in the cover sequences of the Bitlis complex allow the thermal evolution of the massif to be constrained using metamorphic index minerals. Regionally distributed metamorphic index minerals such as glaucophane, carpholite, relics of carpholite in chloritoid-bearing schists and pseudomorphs after aragonite in marbles record a LT–HP evolution. | Turkish Journal of Earth Sciences Turkish J. Earth Sci. Vol. 21 2012 pp. 1-17. Copyright TUBlTAK doi yer-1006-26 First published online 02 February 2011 TUBiTAK Dating Subduction Events in East Anatolia Turkey ROLAND OBERHẢNSLI1 ROMAIN BOUSQUET1 OSMAN CANDAN2 ARAL I. OKAY3 1 Institute of Earth- Environmental Sciences Potsdam University Karl-Liebknecht-Strasse 24 14476 Potsdam Germany E-mail roob@ Dokuz Eylul University Engineering Faculty Department of Geological Engineering Buca TR-35160 Izmir Turkey Istanbul Technical University Eurasia Institute of Earth Sciences Maslak TR-34469 Istanbul Turkey Received 29 June 2011 revised typescript received 08 January 2011 accepted 23 January 2011 Abstract Metamorphic studies in the cover sequences of the Bitlis complex allow the thermal evolution of the massif to be constrained using metamorphic index minerals. Regionally distributed metamorphic index minerals such as glaucophane carpholite relics of carpholite in chloritoid-bearing schists and pseudomorphs after aragonite in marbles record a LT-HP evolution. This demonstrates that the Bitlis complex was subducted and stacked to form a nappe complex during the closure of the Neo-Tethys. During late Cretaceous to Cenozoic evolution the Bitlis complex experienced peak metamorphism of GPa at 350-400 C. During the retrograde evolution temperatures remained below 460 C. 39Ar 40Ar dating of white mica in different parageneses from the Bitlis complex reveals a 74-79 Ma Campanian date of peak metamorphism and rapid exhumation to an almost isothermal greenschist stage at 67-70 Ma Maastrichtian . The HP Eocene flysch escaped the greenschist facies stage and were exhumed under very cold conditions. These single stage evolutions contrast with the multistage evolution reported further north from the Amassia-Stepanavan Suture in Armenia. Petrological investigations and isotopic dating show that the collision of Arabia with Eurasia resulted in an .

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