GEOL 1001 Chapter : Geology Unit 3
Document Summary
Chapter 9: crustal deformation & mountain building10/9/2012 5:28:00 pm. Mountain belts: mountains frequently occur in elongate, linear belts, orogenesis. Orogenic belts: mountains are born and have a finite lifespan, young mountains are high, steep and growing upward (rockies, middle-aged mountains are dissected by erosion. Most common: tensional pull-apart tends to thin material(mor, shear blocks of rock sliding past one another. Crust is neither thickened or thinned: tectonic collision produces horizontal compression, pressure an object feels the same stress on all sides (equally) Geologic structures geometric features created by deformation: folds, faults, joints, etc, 3-d structural orientation is described by strike and dip, strike horizontal intersection with a tilted surface, dip angle of surface down from the horizontal. Reverse fault hanging wall moves up (thrust fault, a special type of reverse fault) Normal fault hanging wall moves down (most common because it goes with gravity: strike-slip faults fault motion is parallel to the strike of the fault.
