Evolution of a mid-Tertiary extensional shear zone in the southern Menderes massif, western Turkey

Bozkurt E., Park R.

BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE, vol.168, no.1, pp.3-14, 1997 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 168 Issue: 1
  • Publication Date: 1997
  • Journal Name: BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3-14
  • Keywords: southern Menderes Massif, mid-Tertiary extensional shear zone, western Turkey, metamorphic core complex, METAMORPHIC CORE COMPLEXES, PAPUA-NEW-GUINEA, SOUTHEASTERN CALIFORNIA, DENTRECASTEAUX ISLANDS, SOUTHWESTERN TURKEY, TECTONIC EVOLUTION, DETACHMENT FAULTS, AEGEAN SEA, GREECE, ORIGIN
  • Middle East Technical University Affiliated: Yes

Abstract

The late Oligocene evolution of the southern Menderes Massif in western Turkey involves deformation in a crustal-scale, moderately dipping, ductile shear zone. The granitic rocks of the massif have been progressively transformed to augen gneisses along the footwall of a south-dipping extensional shear zone. The augen gneisses are strongly mylonitic and exhibit a moderately dipping foliation variably associated with a pronounced NNE- to NNW- trending mineral elongation lineation. The non-coaxial fabrics formed during mylomitization strongly suggest an unambiguous top-to-the-south, down-dip shear sense in a direction parallel to the south plunging stretching lineation. The mylonitic foliation was later deformed into NNE-SSW trending open folds, with axis approximately parallel to the mineral elongation lineation, which suggests that the ductile deformation was accompanied during its later stages by WNW-ESE directed compression.