Micro structural and Strain analysis of Siah khani sheet in southern Gorgan

Category Tectonic & Seismotectonic
Group GSI.IR
Location 23th symposium on geosciences
Holding Date 05 May 2008

      Siah khani sheet is one of the eight thrust sheets in the Eastern Alborz across Damghan- Gorgan erea. Since this sheet is the most important of thrust sheets in this erea and has sufficient evidence for investigation, was selected in this study.
   Deformation analysis in the sheet was carried out using finite strain and microstructural studies. These studies demonstrate that the value of finite strain increase approaching the base of thrust sheets. Similarly, microstructural changes in form of grain size reduction. Intracrystalline deformation also increased toward this basal zone. These analysis indicate that the Siah khani sheet is mainly effected the sedimentary cover . therefore is one of the late Alpian orogeny thrust sheets in the Eastern Alborz.