Polar Mohr diagram method and its application in calculating the shear displacements of general shear zones with volume loss |
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| Authors: | Hai Li Zhaojie Guo Ruixun Liu Shuwen Liu and Zhicheng Zhang |
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| Institution: | (1) Department of Geology, Peking University, 100871 Beijing, China |
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| Abstract: | The main problem, in determining the shear displacement of a general shear zone with volume change using the available formula,
is that it is hard to know the initial angle between the planes (or lines) in the plane of shear. A planar deformation analysis
of this kind of ductile shear zone is carried out with the polar Mohr diagram. If the volume change is induced by homogeneous
contraction in the Z direction of the shear zone, there are sufficient conditions for constructing a polar Mohr diagram regardless
of sequence of the simple shear and volume change. Therefore, the angle between a line and the shear direction before and
after the deformation can be measured. Making use of these lines the shear strain and the volume change can be calculated
and the shear displacement can be determined. |
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| Keywords: | shear displacement volume change polar Mohr diagram |
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