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rich Younger What phase of magma fractionation would result in the
placement of this ore body?
Which formed first, the ore body or the fault?
What common mineral is mostly likely in the ore body? Reverse Normal This poor guy is out of luck Miners pay geologists to
find their lost orebody
One friend earned
enough to buy a house http://pangea.stanford.edu/~laurent/english/research/Slickensides.gif Fracture Zones and Slickensides
c) Visible displacement of rocks
Pulverized rock and “Slickensides”
Key beds cut out by faulting reappear elsewhere. Types of Faults - 2
• Strike-slip faults 1) Example: San Andreas
Distinctive landforms (linear
valleys, chains of lakes, sag
ponds, topographic saddles)
Fresh pulverized rock.
Transform fault through granite:
Evidence of Shear stress 2)
4) Horizontal Movement Along
Strike-Slip Faults & Plate Tectonics
Transform Plate tectonics and faulting
• Normal faults: mid-ocean ridges and
continental rifts are the same thing.
• Divergent Margins
– Surface rock is pulled apart
– Hanging wall drops down Horst and Graben Formation
Graben Graben in
Iceland Source: Simon Fraser/Science Photo Library/Photo Researchers, Inc. Plate tectonics and faulting
• Shallow dipping Reverse Fault called a
• Reverse and thrust faults: convergent
• Hanging Wall is pushed up. Lewis Thrust Fault
Lewis Lewis Thrust Fault (cont'd)
Lewis Same layer Lewis Thrust Fault (cont'd)
Lewis Source: Bre...
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This document was uploaded on 01/26/2014.
- Winter '14