Structural investigation of Sefidabe and Hyderabad antimony ore deposits in the Sistan Suture Zone, southwest of Sefidabe

Sefidabe and Hyderabad antimony ore deposits are located in the southwest of Sefidabe and in the Sistan Suture Zone .In order to structural analysis of these areas, at first, using satellite images, tectonic lineaments were extracted and the areas with the highest density of length and direction were determined. Then, in the field surveys, veins, faults and mineralization occurred along them were taken. By using stress analysis software, the direction of the principal stresses in the area and the relationships between these structures, tectonic faults and mineralization were analyzed. Compressive shear zones with a northwest-southeast trend are caused by a constraining bend formed between the two of Neh and West-Asagi main faults, is the main factor of mineralization in the study area. This positive flower structure has strongly affected the Paleogene sedimentary and igneous rocks of the region. The Moore's circle indicate a compressional to wrench tectonic regime with the maximum stress direction (03/215) in the northwest-southeast. In this stress regime, in addition to thrust faults, a group of conjugate faults with an acute angle and tensile fractures aligned with the direction of maximum principal stress have formed, which have provided a suitable environment for fluid injection by creating weak zones.