EARTHSC 1105 Lecture 27: Lecture 27 - Mountain Building
28 Nov 2017
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Terms: cordillera spanish for mountain range, orogeny mountain building event, craton old, stable core of a continent, tectonic accretion addition of block of continental crust or island arc to a continent. Stress and strain: stress force per unit area that is exerted on rocks or other material. Three types: compressive, tensile (tension), shear, strain deformation induced by stress. Three modes or types of deformation: elastic deformation deformed material/body returns to the original shape after stress is removed, if the yield point is not reached, which is the elastic limit. 2: pressure (high temperatures & pressures enhance ductile (elastic) behavior). Most materials are weaker at higher pressures: magnitude of stress, strain rate (high strain rates = faulting, low strain rates = folding). Types of plate boundaries: divergent (mid-atlantic ridge) mid-ocean ridges form major mountains ranges under the oceans, convergent (western south america; india/asia), transform (strike slip)- (san andreas fault system).
