The geometric and kinematic characteristics of these splays are influenced by folding mechanisms. Introduction: The East Iran orogen has experienced multiple buckling phases resulting in the formation of strike-slip fault splays. 5Department of Earth Sciences, Utrecht University, Utrecht, Netherlands.4Department of Geology, University of Birjand, Birjand, Iran.3Department of Geology, Shahid Bahonar University of Kerman, Kerman, Iran.2Department of Seismotectonics, International Institute of Earthquake Engineering and Seismology, Tehran, Iran.1Department of Earthquake Research, Shahid Bahonar University of Kerman, Kerman, Iran.Slides would occur between two strata,thus make the stress outlet,and prevent it from cracking.Ahmad Rashidi 1,2* Shahram Shafieibafti 3 Majid Nemati 1,3 Maryam Ezati 4 Ebrahim Gholami 4 Seyed Morteza Mousavi 4 Reza Derakhshani 3,5* Another situation is that the block has planar features. One situation is that the block is a whole that every parts is the same,when undergoing the slides,en-echelon is formed. In fact,the mechanism of en-echelon formed by strike-slip fault and the kink band is the same,though result is different.The key to this problem I think is the rock character.The band is the zone in which the common short straight limb bounded by the two adjacent fold surfaces Markedly asymmetric chevron with a very long limb and a very short limb Kink band Fault zone developed in strike-slip fault is between two boundings,As slip occurs along the fault bounding the rock between them develops parallel en-echelon tension cracks that give the zone an oblique foliation.Ĭonjugate folds(A,B) with opposite sense of asymmetry and polyclinal folds(C) with variable axial surfaces Kink band&Fault zone It is a kind of chevron fold which possesses planar limbs and sharp angular hinges.If it is symmetrical,we call it conjugate kink ,and if not,we call it monoclinal Kink band. Several methods can be used to identify the structure displacement joint attitude of fault plane breccia slikenline We observe the structure carefully,it can be inferred that positive flower structure is a combination of reverse fault, whereas the negative consists of a group of normal fault.C- Positive and negative flower structures produ- ced by convergence and divergence respectively in strike-slip motion D-Strike-slip duplexįLOWER STRUCTURE IN STRIKE-SLIP FAULTS Positive flower structure for uplift blocks Negative flower structure for depressed blocks B-Formation of raised and depressed wedge- shaped blocks by local transpression and transtension. Strike-slip faultsystem A- Local compressional and extensional struc- tures produced by fault terminations and fault overlaps. Part A combines both strike-slip movements and compression.It would move upwards to form positive flower structure,as to part B,the extension and the gravity prompt block to fall downwards,thus form negative flower structure. If the fault plane curves,under the effect of greatest stress,it would bear movement along two direction.because of the characteristics of adjacent blocks and even form a zone(C). The strike line on the ground extends straightly in a region(picture A).But there are some exceptions. Fault plane usually is a plane and the dip angle is approximate 90 degree.(Down plunge view) σ3 σ1įault orientation in relation to principal stress axes (After E.M.Anderson, 1951) A Normal fault sets. The force system of strike-slip fault is plotted as follows The greatest stress is horizontal, the smallest stress is horizontal, two sets of strike-slip fault inter- sect along the intermediate Picture in two dimension stress,each dipping vertically. Different force situations would generate different faults. Mechanism of strike-slip fault Fault is the result of force and stress. sinistral(left lateral)-the opposite block moves to the left dextral(right lateral)-the opposite block moves to the right. Definition : a kind of fault that the two blocks move along the strike direction of fault plane.Strike-slip fault and its related structure 01003117 LuoMao
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