Muteh Metamorphic- Magmatic belt, in the northwestern part of Sanandaj- Sirjan zone and the NE of Golpaygan, is composed of metamorphosed deformed sequences of sedimentary, volcanic (basic and acid) and volcano-sedimentary rocks. This belt consists of three separatable complexes including gneiss complex, green-schist complex and slate complex, from bottom to top, based on lithology, metamorphic facies and even the style of deformation.Metamorphic complexes of Muteh region have undergone progressively three metamorphic-deformation events to amphibolite facies, therefore, represent a Poly-metamorphic character. The effects of Late Cimmerian and Laramian orogenies and their related acidic plutonism, have partly obliterated all the previous events in this region, but the Early Cimmerian orogenic phase is considered as the most important metamorphic deformation event in the southeastern part of Sanandaj-Sirjan zone by various geologists. Dating on various samples of the region indicates the granitoid bodies were emplaced of Middle to Late Cretaceous, Late Paleocene and Paleocene-Eocene.

The Mouteh area is located 270-km southwest of Tehran. It is a part of Sanandaj-sirjan Zone and contains metamorphosed igneous-sedimentary complex (predominantly composed of mica-schist, mylonitic felsic met igneous rocks), granitoids and sedimentary assemblage. A progressive deformation affected on these lithologic assemblage. This process contains three deformation stages including: D1, D2 and D3. Result of the first deformation stage (D1) is production of a compositional layering in different parts of this area containing alteration of layers rich in felsic (quartz and feldpar) and mafic (biotite and amphibol) minerals. Structural event that produced this compositional layering (s1) has been overprinted by following stages. The second stage of deformation that is the most important event of deformation in the Mouteh and adjacent areas developed a penetrative mylonitic foliation (S2 =Sm) and stretching/ mineral lineation (Lm). Folds that are related to this stage, have high amplitude and low wavelegth and their inter-limb angle is less than 30 (tight to isoclinal).Many of these folds of this stage (fold axes and stretching lineation) have shallowly plunging in different parts of the area. Trend of deformation produced open folds that has changed position of the second structural elements development of dextral en-echelon fault system with sinistral-revers sense of movement is the main character of this stage. Several joint systems are related to this event. The most activity of magmatism occurred during this stage. The mouteh granitoid appears to intruded after DJ & D2 deformations along "transtension shear zones". This deformation was accompanied by remobilization of quartz pyrite and chalcopyrite(hosting gold)from granitoid intrusion.

On the basis of Kinematic findings at different scales in Quaternary fault zones, and using modem methods of fault slip analysis, Quaternary stress field was reconstructed. Orientation of slip plane, slip vector, principal stresses, shape of stress ellipsoid and angle of internal friction are involved the fault slip analysis. Orientations of σ 1, σ 2 and σ 3 stresses for primary data (nonrotated) were determined as 084°/04°, 232°/82° and 077°/08° respectively. The shape of stress ellipsoid was defined on the basis of shape factor [R= ((σ 2 - σ 3)/( σ1 - σ 3)] (Angelier, 1975). The R-value for all studied regions was about 0.5 and deformation type was mainly left lateral transpressional with small reverse components. Such results are evidence of north trending σ1 in the region and northward movement of the crust. The results are in agreement with other method such as focal mechanisms of earthquakes.

The Shotori mountain range at northern end of the Nayband active fault is one of the east central Iranian ranges in east of Tabas city and playa. Old alluvial cyclic stream terraces and buried Quaternary fault scarps in western mountain front area, and three kind of old, braided, and active alluvial fans in Tabas plain are witnesses to mountain neotectonic uplift, westward migration of Quaternary sedimentation, and eastward movement of retrograde erosion along seasonal rivers. Ancient perched caves and qanats in alluvial valley slopes present the speed of deep erosion.Outcropped Neogene anticlines, old erosional terraces, meandring antecedent river gorges, and warping of the old fans in Tabas plain all point to periodic active uplift of the plain with respect to the playa. Geomorphic indices, such as knickpoints in longitudinal river profile, valley width/heigth ratio, and mountain front sinuosity show that the active tectonic movements are due to the Quaternary faults in the Tabas plain and along northern and southern parts of the moimtain front, but the middle front seems to be inactive in the present time.Meanwhile, the 1978 earthquake of Tabas (Ms=7.3) after an 11-century seismic gap is a proof to the active westward migration of the deformational front. In this way, the close relationships between the tectonic geomorphology of the area and the seismotectonics of the recent earthquake led us to introducing relic, inactive, active, and new-born mountain fronts in the area; and the role of such studies in better undrestanding of activity and seismicity history of regions is emphasized.

A 2.5x10 km body of NE-trending mylonitic granite is exposed north of Aliabad-e-Damag, 35 km south of Hamadan. Mylonite and the surrounding schists have concordant fabrics parallel to the dominant foliation in the region. Structural and fabric analysis suggests deformation in a dextral strike-slip shear zone. The strong deformation and associated low grade metamorphism were coeval with plastic intrusion and continued to the end of crystallization. The granite has a retrograde thermal effect on the surrounding metamorphic rocks. Sigmoidal geometry of the large Hamadan pluton and the position of the dextral shear zone at the southeastern part of this system indicate the significance of dextral transpression tectonic in this region of the Sanandaj- Sirjan zone and rotation of the shear fractures in emplacement of the Aliabade-e-Damag pluton and subsequent intrusion of the Hamadan batholith.