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Lecture

Econ in the news 6

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Department
Economics
Course
ECONOM 1051
Professor
George
Semester
Fall

Description
Chapter 14: Convergent Boundaries I. Wegner’s Continental Drift­ matching of coastlines, matching of geological  structures, fossil evidence, distribution of ancient glacial deposits  (paleomagnetism made us accept the truth) II. Mountain building and evolution of continents A. Moutain belts ­orogenesis: produces compressional mountain belts consisting on folded  and faulted sedimentary and volcanic rocks, portions of which have been  metamorphasized, intruded by younger igneous bodies. Includes folding,  thrust faulting, metamorphism, igneous activity B. Mountain Building at convergent plate boundaries 1. Aleutian type (ocean­ocean)  2. Andean type (ocean­continent)­ Andean­type mountain building • Mountain building along active continental margins; an oceanic  plate subducts under a continental plate; Exemplified by the Andes  Mountains 3. Tibetan type (continent­continent) III. Subduction Zones­ plate convergence leads to four areas: A. deep­ocean trench: forms where subducting slab of oceanic lithosphere  bends and descends into the asthenosphere B. volcanic arc­ built upon overlying plate C. forearc region­ located between trench and volcanic arc D. backarc region­ on side of volcano opposite the trench; backarc basin 
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