Turkish Journal of Earth Sciences (Turkish J. Earth Sci.), Vol.S. ADAMIA 20, 2011, ET pp. AL. 489–544. Copyright ©TÜBİTAK doi:10.3906/yer-1005-11 First published online 11 April 2011 Geology of the Caucasus: A Review SHOTA ADAMIA1, GURAM ZAKARIADZE 2, TAMAR CHKHOTUA3, NINO SADRADZE1,3, NINO TSERETELI1, ALEKSANDRE CHABUKIANI1 & ALEKSANDRE GVENTSADZE1 1 M. Nodia Institute of Geophysics, 1/1 M. Alexidze str., 0171, Tbilisi, Georgia (E-mail:
[email protected]) 2 Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS, 119991, Moscow, Russia 3 Al. Janelidze Institute of Geology, 1/9 M. Alexidze str., 0193, Tbilisi, Georgia Received 15 May 2010; revised typescripts receipt 30 January 2011 & 14 January 2011; accepted 11 April 2011 Abstract: Th e structure and geological history of the Caucasus are largely determined by its position between the still- converging Eurasian and Africa-Arabian lithospheric plates, within a wide zone of continental collision. During the Late Proterozoic–Early Cenozoic, the region belonged to the Tethys Ocean and its Eurasian and Africa-Arabian margins where there existed a system of island arcs, intra-arc rift s, back-arc basins characteristic of the pre-collisional stage of its evolution of the region. Th e region, along with other fragments that are now exposed in the Upper Precambrian– Cambrian crystalline basement of the Alpine orogenic belt, was separated from western Gondwana during the Early Palaeozoic as a result of back-arc rift ing above a south-dipping subduction zone. Continued rift ing and seafl oor spreading produced the Palaeotethys Ocean in the wake of northward migrating peri-Gondwanan terranes.