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PHSC107 L16-Rock deformation
Detailed need to know

What you need to know – get more detail on these areas from textbooks / readings – as detailed on moodle page.

Crustal deformation – a process acting on the lithosphere. Driven by plate tectonics.
Orogenesis –(mountain building – Oro = mountain) – large scale bending, breaking, stretching etc.

Application of stress to rock • Change in shape = deformation strain. Brittle or plastic failure. • Creates joints, folds, faults, foliation. Fractures can be offset or not. • How deformation affects rocks – by translation, rotation, distortion

Strain • Change in shape • elastic strain (reversible change) • Permanent strain – brittle & ductile deformation (non-reversible) • Cause of deformation – stress – force acting on a rock – often a large scale tectonic origin. Stress is force per unit area. Think of the non-metric measure PSI – (pounds per square inch)

Stress • Compression – squeezing, shortening or contraction, or pushing together. Think continental collision – Himalayas formation. • Extension – tension, stretching, pulling apart. Tends to thin the crust – think the Taupo Volcanic zone which is extending at 7 mm a year. The lithosphere is thin allowing magma to reach the surface. • Shear – sliding past, strike-slip. Blocks of rock slide past each other – the surface is neither thickened or thinned. Think the Alpine Fault.

Deformation structures (brittle) – for these, need to be able to draw a diagram. • Normal fault. Due to extension. • Reverse fault (> 35 degrees) – due to compression • Thrust fault (< 35 degrees) – compression on a shallow-dipping fault plane. • Strike-slip fault (Waiarapa fault) – recognising left lateral, right lateral. The ages and displacements (horizontal nad vertical) indicate the amount of movement on the fault plane, during one rupture event.

Fault systems (large scale grouping of faults) • Thrust fault. A sequence of repeating reverse faults. Example is the east coast of the North Island. • Normal fault A sequence of tension or extension faults. Lithosphere thins.

Deformation structures (flexible)
Can use a piece of paper to simulate this. We will talk more about these in the field trip and in lab 6. • Folds • Symmetric, asymmetric, overturned, limbs, axial plane. Be able to draw these folds and label the parts. • Anticline, syncline, plunging. Ditto with drawing and labelling. • Domes and basins. Be able to visualise these models – mental models of large geological structures allows a way of simplifying reality – and visualising the structures in the landscape. • Joints – no visible displacement; may be expansion / cooling joints. • Tectonic foliation – shearing stress can cause this type of metamorphism – development of a foliated texture.

Key words
Orogenesis
Stress
Strain
Joints
Folds
Foliation
Faults
Elastic and permanent strain
Brittle and ductile deformation
Compression, tensional, shear stress
Normal, reverse, strike-slip faults
Fault scarp
Left-lateral, right-lateral strike slip fault
Anticline
Syncline
Symmetrical, asymmetrical, overturned folds
Dome, basin

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