Structural analysis of en-echelon vein and foliation result of solution in Kowlikosh shear zone

Category Tectonic & Seismotectonic
Group GSI.IR
Location 20th symposium on geosciences
Holding Date 16 April 2008

     Kowlikosh shear zone is part of the Sanandaj-Sirjan metamorphic belt, which have been affected by brittle-ductile and ductile debrmation.
Structural and geometrical analysis show that the first generation of en-echelon arrays has been rotated relative to second generation of
en-echelon arrays. This indicates that like any material line rotated afler principle incremental strain axes (ISA) oriented: En-echelon arrays formed in non-coaxial inhomogeneous simple shear deformation. With respect to the orientation of en-echelon veins and foliations result of solution determined the principle trend of incremental strain axes that correspond whit general trend of Zagros thrust and Sanandaj—Sirjan zone.
Formations of these structures are due to two phases of deformation:
-En-echelon arrays have been formed during Alpine orogenic movement.
-Foliations result of solution has been formed during Late Triassic orogenic movement
Dcpartmcnt of geology, university of Shiraz

tags: FARS