111-pp31 - UNIVERSITY OF SOUTH ALABAMA Last Time GY 111:...

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1 GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 31: Mountain Building 2: The Appalachians Lecture 31: Mountain Building 2: The Appalachians Last Time Mountain Building 1 A) Distribution of mountain belts (the return of plate tectonics) B) Isostasy and the Rock Cycle (again) C) Thrust Faults in the Rockies (movie) Mountain Belts Old Mountains New Mountains Isostasy (Isostacy) The depression of the asthenosphere beneath mountain belts due to loading followed by rebounding as erosion occurs. Styrofoam sheets on water The Rock Cycle Faults on Maps There is a special class of reverse fault that is common in mountain belts Thrust Faults
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2 Today’s Agenda Mountain Building 2 A) Appalachian “provinces” (Alabama!) B) Paleozoic time-frame/orogenies C) How to make a mountain belt Web notes 42 Appalachian Mountains Appalachian Mountains Four geological belts are identified 1) Plateaus (undeformed) 2) Valley and ridge (folded/faulted) 3) Piedmont (Highly metamorphosed)
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111-pp31 - UNIVERSITY OF SOUTH ALABAMA Last Time GY 111:...

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