Review11 + C 2

Review11 + C 2 - Chapter 11 Mountain Building 1. Why do...

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Chapter 11 – Mountain Building 1. Why do mountains usually occur in linear belts? Mountains occur as part of linear ranges. The elongated mountain belts are constructed by tectonic plate interactions. Why do mountains have a finite lifespan? Orogeny has a limited lifetime. The process begins, lasts for tens of millions of years and then cases. After it ceases erosion may eventually bevel the land surface almost back to sea level (sometimes in less than 50 million years) What are the differences between deformed and undeformed terranes? Orogeny causes deformation. Deformed terrane passes into undeformed terrane: - Deformed (strained) – tilted beds, metamorphism (sand quartzite, clay slate), folding and faulting - Undeformed (unstrained) – horizontal beds, spherical sand grains, flat-lying clays, no folds or faults What types of geologic structures are formed as a result of deformation? - Joints – Fractures with no offset - Faults – Fractures with offset - Folds – Layers bent by slow plastic flow - Foliation – Planar metamorphic fabric 2. Know how a cube of geologic material will respond when subjected to pressure, compressional, extensional, and shearing stresses. Pictures on slides: - Pressure – Same stress on all sides - Compression – Squeezing (tends to thicken material) - Extension – Pull apart, greater stress in one direction (tends to thin material) Shear – Blocks of rock sliding past one another (crust is neither thickened or thinned) What types of changes in shape are expected as a result of stress? (hint: brachiopod shell)
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Review11 + C 2 - Chapter 11 Mountain Building 1. Why do...

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