The Study of Rose Diagrams by Statistical Joint systems of Intrusive Rocks in Shahrestan Area, Piranshahr (West Azarbaijan)

Shahrestan mining district is the largest extensive granitic stone province in Iran. There are 25 active mines in this area. The study of rose diagrams with statistical joint systems at this ornamental stone mining district carried out in order to reduce expenses with low waste disposal of mining extraction. The most types of intrusive rocks are syenite, monzonite, gabbro and granite cropped out in the region. Alkali syenite is the main rock type in spite of varying color and texture. Diversity of apparent color and rock composition associated with variety of color in low distances, existence of joints, faults and thrusts around formations and rocks of moderately being metamorphosed, are the source of major problems in the region from the exploration till the excavation stages. The study results indicate that the main folding trend is extended in a northwest-southeast direction. Therefore the direction of quarries in central part must be developed in a north-south direction and in the northwest part in northwest-southeast direction while in the east of Shahrestan quarries must be created in a northeast - southwest trend.