Non-coaxial deformation in sphalerite strain fringe: A kinematic shear indicator in overturned limb of a hanging wall fold
Subject Areas :
علي
Nakini
1
(Tarbiat Modares University)
علي
Yarmohammadi
2
(Tarbiat Modares University)
Keywords: Sphalerite Shear sense Folding Reverse fault Strain fringe Fiber. ,
Abstract :
Kinematic evidence of shear deformation in strain fringes of sphalerite mineral in an overturned limb of a fold structure are studied. Structural observation in Cretaceous rocks of Tiran Mine Area in west Esfahan, reveals a shear deformation in overturned limb of a hanging-wall anticline that has generated with reverse fault in the area. Orientation of strain fibers and their rotations in strain fringes of sphalerite minerals are used for determination of stress orientations and its changes during shear deformation process. This fabric indicates kinematic evolution of the overturned limb of a hanging-wall anticline and related reverse fault during folding. In this study, amount of stretching in strain fringes and their rotation are measured by object-centre path model.