Lecture 12 (February 13): Faults
Brief outline of this lecture:
Faults in the field
Faults in a plate-tectonic context
Main points of this lecture:
Different kinds of faults can be linked to different kinds of stress.
Drag folds are small partial folds along and generated by faults.
Newly-formed faults may be evident because of their disruption of the land surface.
Old faults may be evident because they have been eroded to make more-or-less linear valleys.
The faults on our handouts of plate tectonic boundaries should now make sense in terms of the stresses encountered there.
Fractures are breaks in rock along which no motion is evident.
Figures used in this lecture:
Faults: a definition and two handy terms
Surface expression of faults
Divergent plate boundaries (a diagram used earlier in class)
Convergent plate boundaries (a diagram used earlier in class)
Transform plate boundaries (a diagram used earlier in class)
Reading assignment: None.
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