Deformation and emplacement scenario of theSarvejahan Granite SE Zanjan

Abstract NW-SE trending Sarvejahan granite with Precambrian age in about 15 Km2 areas has intruded in Precambrian Kahar Formation with an obvious contact aureole in the Soltanyeh Mountains in SE Zanjan. The Sarvejahan granite has exposed at the hanging wall, SW side of the moderately dipping Soltanyeh reverse fault. Deformation fabrics in granite demonstrate a ductile mylonitization indicating deformation in a ductile shear zone at appropriate deep situation in the crust. Structural study of mylonitic fabrics in granite indicates a shallowly to moderately plunging stretching lineation and moderately to shallowly-dipping foliation in a dome geometry. The Soltanieh reverse fault has transported and elevated the granite over the Karaj Formation with Eocene age. Considerable wide fault zone containing advance alterations indicate the role of Soltanyeh fault during alteration and exposition of the Sarvejahan granite at surface. Structure and fabric study in the Kahar Formation and metamorphic rocks in contact aureole in addition to ductile fabrics of the Sarvejahan granite indicate that the Soltanyeh fault has played main role after Eocene during collision event and exposition processes.