THE GEOLOGY OF THE SOUTH OF MANYAS (BALIKESİR) AND TECTONIC SIGNIFICANCE OF BLUESCHISTS

Year 1998, Volume: 120 Issue: 120, 81 - 95, 01.01.1998

H. Serdar Akyüz Aral I. Okay

Abstract

The study area comprises mainly
Karakaya complex units of Sakarya zone, a granodioritic pluton which cuts the
Karakaya complex and unconformably overlying Neogene sedimentary and volcanic
rocks. Apart from these, a small blueschist klippe rests on the Karakaya
complex. The Karakaya complex in the area studied is made up of Nilüfer unit
and tectonically overlying Triassic detritics (Hodul unit and Orhanlar
greywacke). Nilüfer unit consists of metabasite-metapelite-marble intercalation
at the base and monotonous marbles at the top. Nilüfer unit has undergone
greenschist fades metamorphism probably during Late Triassic. Nilüfer unit is
in tectonic contact with detritic rocks bearing neritic limestone blocks of
Carboniferous-Permian age and rare spilite blocks. A blueschist klippe, which
consists of metabasites, is observed on the Nilüfer unit and on the Triassic
detritics to the south of Manyas. The metamorphic age of the blueschist is Late
Cretaceous as reported from south of Mustafakemalpaşa. The exhumation of
blueschists mainly occurred during the latest Cretaceous. Thus, the thrusting
of blueschist onto Karakaya complex units took place probably during the
Paleocene continent-continent collision. Main blueschist belt is located to the
south of klippe which indicates a northward vergence. This shows that
back-thrusting occurred during continent-continent collision in the western
Anatolia.

Keywords

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