Tuesday, April 17, 2012

Deformation of the Earth's Surface

Image: Tasa Arts

There are three basic types of stress that we covered in class:
  • Tensional- this happens when the crust is pulled apart.
  • Compressional- the crust is compacted/ pushed together.
  • Shear- a piece of the crust has opposing movement acting on it.
Deformation of a body of rock will cause a change in the rock and/or change in volume.

Two basic types of deformation:
  • brittle- near surface rocks, low pressure/low temperature, typically granite and basalt, process takes a long time and fracturing of the rock will occur
  • ductile- greater depth in the surface, high pressure/high temperature, sedimentary rock, process takes a long time, bending of the rock occurs.

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