Writers : Boozari, Emami
Refference : Geosciences Scientific Quarterly Journal,No.:49-50,P.:52
Publishing Year : 1383

Abstract :
The study region covering 610 square kilometres is located in south-east of Hamedan in the northern part of the Sanandj- Sirjan belt This region consists nuainly of micaschists and slate with a nearly northwest - southeast trend. This complex (tectonites) is Pre-Jurassic, which during two phases has undergone plastic deformation and comprises chiefly S-L tectonites and in some parts S tcctiontcs.
In the first phase, schistosity (S1) was formed Parallel to the sedimentary bedding with average strike and dip of N135/56E and N138/30SW. Moreover, during this phase many kinds of linealions have resulted from microfold, mineral and pressure shadow. The wavelength of mictofotds is a few millimetres and alternatively followed by one another with N188/12 trend. Minerals which constitute the lineation are mica and amphibole. Staurolite and garnet porphyroblasts are pre to syn-tectonic. Also at this phase, intrafolial folds of quartz vein were formed in between the first schistosity.
The second phase of deformation was created following the lateral forces (with N56 trend) which constitutes the basic structure of the region. S2 Plane in this phase was formed following S1 flexural-slip folding which created axial plane of folds with N164/6 1NE and N154/64SW. Second lineation (L2 ) with arerage trend and plunge N157/07 is also the axies of these microfolds. Other lineations of this phase are intersected by andalusite lineations which are . Macrofolds are longitudinal type and located in succeeding anticlines and synclines with arerage axial plane of N148/74SW parallel to L2 Muscovite and quartz subfabric elements are oriented in this phase and like S1 , S2 and L 2 fabric elements have orthorombic symmetry.
Subject List : Subsidence