High-pressure/low-temperature metamorphic rocks of Turkey.


Okay A.

Blueschists and Eclogites, pp.333-347, 1986 (Refereed Journals of Other Institutions) identifier

  • Publication Type: Article / Article
  • Volume:
  • Publication Date: 1986
  • Title of Journal : Blueschists and Eclogites
  • Page Numbers: pp.333-347

Abstract

Five major high-P metamorphic complexes are recognized in Turkey, The Tavsanli zone in western Turkey is the largest and most important high-P - low-T metamorphic belt. It consists of a thick basal marble unit overlain by metabasite, metachert and metashale. The HP/LT metamorphic rocks are tectonically overlain by a non-metamorphic ophiolite nappe. The metamorphic nappes, situated on the Mediterranean coast in southern Turkey, consist of three superimposed flat-lying nappes; only the intermediate nappe (Sugozu nappe), comprising abundant garnet-mica schists and rare bands of metabasite, shows an early eclogite/blueschist-facies metamorphism overprinted by a later greenschist-facies metamorphism, which also affected the other two nappes and welded them into one unit. Unlike the Tavsanli zone, Alanya blueschists are allochthonous and consist mainly of shallow-water sedimentary rocks. The age of metamorphism in the Alanya nappes and in the Tavsanli zone is mid-Cretaceous. The Bitlis massif in eastern Turkey is the third major high-P metamorphic complex of the Taurides. The Bitlis massif has undergone a Precambrian eclogite-facies metamorphism, evidence of which was mostly destroyed by the Alpine greenschist-facies metamorphism. The Karakaya complex of the Pontides has an extensive distribution in northern Turkey. It has undergone a high-P greenschist-facies metamorphism during Triassic time with local development of crossite in metabasic rocks. Elekdag blueschists in north-central Turkey consist of an ophiolite nappe with serpentinite, gabbro and diabase, and an ophiolitic melange metamorphosed in the blueschist facies.-J.M.H.