The Çataldağ Plutonic Complex In Western Anatolia: Roles Of Different Granites On The Crustal Buildup In Connection With The Core Complex Development


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Kamacı Ö. , Ünal A. , Altunkaynak Ş.

in: Active Global Seismology: Neotectonics And Earthquake Potential Of The Eastern Mediterranean Region, İbrahim Çemen,Yücel Yılmaz, Editor, John Wiley & Sons, West Sussex, UK , New Jersey, pp.189-222, 2017

  • Publication Type: Book Chapter / Chapter Research Book
  • Publication Date: 2017
  • Publisher: John Wiley & Sons, West Sussex, UK 
  • City: New Jersey
  • Page Numbers: pp.189-222
  • Editors: İbrahim Çemen,Yücel Yılmaz, Editor

Abstract

This study documents the geology, structure and age of the Çataldağ Plutonic Complex (ÇPC), the rock association within the footwall of the Çataldağ Detachment Fault zone (ÇDFZ). ÇPC consists of two contrasting granitic bodies; an older granite-gneiss-migmatite complex (GGMC) and a younger I-type granodioritic body (ÇG: Çataldağ granodiorite). GGMC is a heterogeneous body consisting of migmatite, gneiss and two-mica granite, and represents a deep–seated pluton. By contrast, ÇG represents a discordant, shallow level intrusive body. New U-Pb zircon (LA-ICPMS) and monazite ages of GGMC yielded magmatic ages of 33.8 and 30.1 Ma (Latest Eocene-Early Oligocene). 40Ar/39Ar muscovite, biotite and K-feldspar from the GGMC yielded the deformation age span 21.38±0,05 Ma and 20.81±0.04 Ma, which is also the age of emplacement age (20.84±0.13 Ma and 21.6±0.04 Ma) of ÇG. 

ÇG-GGMC duo represents a core complex, which was exhumed in the early Miocene as a dome structure in the footwall of a ring-shaped low-angle detachment surface. A number of micro and meso scale shear sense indicators display evidence that the rocks underwent a ductile deformation in the earlier stage of the elevation which was superimposed later by a semi-brittle and brittle deformation. They indicate top-to-north and top-to-NE sense of movement. The exhumation process was partly contemporaneous with the development of the major core complexes of the region (e.g. The Menderes Massif and The Kazdağ Massif) as a result of combined effects of thermal weakening and roll-back of the Aegean subducted slab during the Oligocene-Early Miocene.