Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Kinematic analysis of positioning of the Western part of Miami fault zone- Eastern Alborz - based on experimental evidence

Document Type : Original Research Paper

Authors
M Rostamiyan 1
M Khademi 2
S.S Eslami 2
H Shahbazi 1
1 M.Sc., Department of Geology, Damghan University, Damghan, Iran
2 Assistant Professor, Department of Geology, Damghan University, Damghan, Iran
10.22071/gsj.2016.41033
Abstract
In the western part of Miami fault zone (MFZ) as a partial boundary of two main structural zones (Centeral Iran and Binaloud) in the Iranian plateau, since the fault is covered by alluviums or displaced rocks, poor and limited field data cannot solve the problems concerning deformation history and evolutionary path of the MFZ. To facilitate unraveling the structural problem, we tried to conduct five experimental models using a combination of compressional, dextral and sinistral mechanisms with changes in the geometry of two main boundary faults. Based on the results, evidences from transpression with dominant dextral component are very similar to field observations along the western MFZ, including folds, Riedel shears, duplexes, fault geometry and bends. Based on the model, deformation in the western part of MFZ is accommodated by dextral non-coaxial shear with compressional component. The experimental model provided a proper insight about deformation history and style. It is proposed that the western part of the MFZ has been deformed by dextral non-coaxial shear with compressional component, and some resultant rotations have probably changed structural trends during time.   
Keywords
Experimental Model
Non-coaxial deformation
Oblique convergence
Miami Fault
Eastern Alborz
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Scientific Quarterly Journal of Geosciences
Volume 26, Issue 101 - Serial Number 101
VOL.26, NO101
Autumn 2017
Pages 79-86