Some aspects of Zargoli granitoid shear zones, NW of Zahedan, Iran

Category Petrology
Group GSI.IR
Location 21th symposium on geosciences
Holding Date 21 May 2008

      Zargoli intrusion, which is located in the NW-SE Zahedan-Saravan Granitoid belt, has intruded into Sistan suture zone as a NE-SW elongated pluton. The plutonic rocks are generally confined into granodioritic field, according to IUGS classification. The granitic rocks, especially those locate at northern parts of the intrusion, suffered high plastic deformation along with relatively extensive shear zones. Occurrence of features such as quartz ribbons, mechanical twining at plagioclases, biotite micafishes and transformation of orthoclase minerals into microcline in these rocks along with formation of S-C type myllonite, all are demonstrations of a dynamic metamorphic event. Distribution and configuration of porphyroclasts in the myllonitic granite exhibit a dextral shear sense