اشكال ساختاري توده گرانيتوئيدي و سنگ هاي دگرگوني منطقه بروجرد

Structural Features of Granitoid Body and Metamorphic Rocks in Boroujerd Area

The Boroujerd granitoid similar to most of the granitoids in world has one foliation that is parallel to country rocks. Microscopic characters show that this foliation is not magmatic but occurred to solid-deformation in high temperature. S-C structures and shear banded together improved cataclastic in outcrop show that the motion of shear zones continues to reduce temperature and brittle deformations over than ductile deformation. Faults are the most important macroscopic structures in area, so these cause different metamorphic facies in two sides of pluton and cause to asymmetry in metamorphic areola. These structures have three trends, one set similar to Zagros trend that mine veins and aplites occurred in this trend. Second set is almost perpendicular to Zagros trend that mine veins and the some of the basic and intermediate dykes occurred in this trend. The third set with southern-northern trend which isnʹt widespread in the studied area. The large folding is another important macroscopic structures that the variety of schistose pole in different points in area imply that these are numerous. At least three deformation phases or different folding and planed structures S1, S2, S3 occurred that the second deformation is the major episode in the area.