Turkish Journal of Earth Sciences

Geological Units and Structures in Suture Zone Around Balıkesir NW Anatolia




The region norheast of Balıkesir comprises different group of rocks reflecting different tectonic settings. Sakarya zone and Tavşanlı Zone are separated by a Mesozoic Tethyan suture zone called İzmir-Ankara suture. Sakarya zone, represented by Karakaya Complex in the study area, is located to the north of a major fault, which marks the northern boundary of Neo-Tethyan suture zone. The Karakaya complex reflects active continental margin units that were formed by southward subduction of Paleo-Tethyan oceanic crust during Permo- Triassic. At this perod, Karakaya complex units were internally imbricated. The closure of the Neo-Tethys ocean, leading HP/LT metamorphizm of northward subducting platform sediments (Orhaneli unit), resulted in the formation of two distinct tectonic units during late Mesozoic to Paleocene; an ophiolotic melange (Ovacık melange) and fault controlled wild-flysch (Bornova flysch). Ovacık melange, which was originally tectonically underlein by Orhaneli unit, detached during uplift of blueschist. Bornova flysch has back-thrushed over Sakarya zone during late Paleocene-?Eocene. A large garnitic pluton, Çatldağ granodiorite, which is a pruduct of extensive calc-alkaline magmatism in NW Anatolia, emplaced into the older units during Early Miocene, and caused titing of older structures around pluton.

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