11 Deformation and Mountain Building

11 Deformation and Mountain Building - Deformation and...

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Deformation and Mountain Building
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Mountain Building: Orogen and Orogeny Oro: Greek for mountain Mountains form in ‘belts’, or orogens Orogeny: mountain building event ~10my long
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How are mountains created? by Tectonic processes, like Continent-continent collision Convergent plate boundaries Continental rifting
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Tectonics → Stresses Stresses → Strain Strain = Deformation Deformation → Mountains (and other things)
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Deformation is… How rocks are moved, squeezed, squashed, stretched, sheared, bent, and faulted Just about anything bad you can do to a rock What is deformation?
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Elements of deformation Stress causes strain Strain is how rock changes shape Deformation is evidence of strain
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Stress Stress = force over some area Force Usually tectonic Or Burial Area Fault, tectonic boundary
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Stress Force/small area = big stress Force/big area = small stress
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Types of Stress
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More Types of Stress
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Evidence of strain Joints Folds Faults
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Layered rocks start out Horizontal Unfaulted Unfolded
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Types of strain Translation Example?
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Types of strain Tilting
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Types of strain Shortening or Thickening
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Folding and Faulting
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Stress is 1. The strain per unit area 2. The force per unit area 3. The same as strain
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Which is not evidence of deformation?
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This note was uploaded on 05/05/2008 for the course GEOL 121 taught by Professor Dr.souter during the Spring '08 term at Towson.

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11 Deformation and Mountain Building - Deformation and...

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