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, cilt.168, ss.3-14, 1997 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 168 Konu: 1
  • Basım Tarihi: 1997
  • Dergi Adı: BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE
  • Sayfa Sayısı: ss.3-14

Özet

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.