Metamorphic Features and Correlation of the Camlica Metamorphics (Biga Peninsula, NW Turkey)

The Camlica metamorphic association located on the western part of the Biga Peninsula covers an area of about 196 km(2). The rock units of the (Camlica metamorphic association are separated into three units, which are described as formations based on the partly determined internal structure, on contact relationships, and on a mappable unit. These formations from bottom to top are, respectively: the Andiktasi formation which comprises metalava, metatuff and metapelite and that appears brown, green, and yellowish green-coloured in the field; the Dedetepe formation which is mainly made up of quartz-muscovite schist, garnet-muscovite schist, garnet-albite-chlorite schist and albite-chlorite-epidote schist, black marble, calc-schist, amphibolite and eclogite. On the top, the Salihlerformation is composed mainly ofphyllite, calc schist and white marble intercalations. The Denizgoren ophiolite, including serpentinised peridotite, tectonically overlies the Camlica metamorphic association. Petrographical vestigations,using index minerals of albite - garnet - epidote - chlorite observed in three different formations, indicate that the Camliea metamorphic association was subjected to the greenschist - facies metamorphism. An early eclogite - facies mineral assemblage of garnet + omphacite + glaucophane + amphibole has been determined. These mineral associations were subjected to amphibolite-facies metamorphism and finally to retrograded greenschist-facies metamorphism. The Camlica metamorphic association is, then, probably an equivalent of the Iznik metamorphics located in the Sakarya Zone in terms of lithostratigraphy, stratigraphy and metamorphic characteristics.