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Paper Information

Journal:   GEOSCIENCES   Fall-Winter 2004 , Volume 11 , Number 49-50; Page(s) 52 To 61.
 
Paper: 

THE GEOMETRICAL ANALYSIS OF MICASCHISISTS IN THE EAST OF HAMADAN BATHOLITH

 
 
Author(s):  FARAH POUR M.M., SEYED ALIZADEH GANJI S.M.
 
* 
 
Abstract: 

The study region covering 610 square kilometers is located in south-east of Hamadan in the northern part of the Sanandj-Sirjan belt. This region consists mainly 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 in some parts S tectiontes.
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 lineations have resulted from micro fold, mineral and pressure shadow. The wavelength of microfolds 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 folging which created axial plane of folds with N164/61NE and N154/64SW. Second lineation (L2) with arerage trernd and plunge N157/07 is also the axies of these microfolds. Other lineations of this phase are interesected by and alusite lineations which are L2. Macrofolds are longitudinal type and located in suceeding 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 L2 fabric elements have orthorombic symmetry.

 
Keyword(s): DEFORMATION, TECTONITE, FABRIC ELEMENTS, SCHISTOSITY, LINEATION, CRENULATION CLEAVAGE, INTRAFOLIAL FOLD, FLEXURAL SLIP FOLDING
 
References: 
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