A9R18EC.tmp 14 - Source P. A. Bourque, 2004 Syncline...

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Prof. M. Fall - University of Ottawa 14 Source P. A. Bourque, 2004 When the stresses are not coaxial, it will develop shearing In the tension , the stresses divergent and cause to stretch the material. Deformation under compressive stress ( shearing ) Deformation (5) 2.2…. Dynamic of the Earth (14) The following figures will show the deformation of rock layers under compression et traction (tension) loads. Let’s take as initial volume, a stack of horizontal rock layers not deformed Source P. A. Bourque, 2004 Deformation (6) 2.2…. Dynamic of the Earth (14) horizontal rock layers not deformed The folds result from plastic behaviour (ductile) of the rocks under compressive stresses. Source P. A. Bourque, 2004 Deformation (7) 2.2…. Dynamic of the Earth (14) The folds result from plastic behaviour (ductile) of the rocks under compressive stresses.
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Unformatted text preview: Source P. A. Bourque, 2004 Syncline Anticline Symmetrical fold Asymmetrical fold Axial plane Overturned fold ( Overturned folds have limbs that dip in the same directions) Plastic deformation – Compressive stress Plastic behaviour Deformation (8) 2.2…. Dynamic of the Earth (14) The brittle deformation is characterized by failures plan, the faults. Source P. A. Bourque, 2004 Brittle deformation – compressive loadings Brittle deformation – Compressive loadings Recumbent folds (Recumbent folds are overturned to the point of being horizontal) Reverse fold Deformation (9) 2.2…. Dynamic of the Earth (14) Source P. A. Bourque, 2004 Normal fold Brittle deformation – Tensile loadings Brittle deformation – tensile loadings Deformation (10) 2.2…. Dynamic of the Earth (14)...
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