GEOL 21062 Lecture 18: Plate Tectonics
31 Jan 2020
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Plate tectonics: perron 12. 001, lecture: history of ideas about plate tectonics, lab: scientific specialties, lecture: rates and patterns of plate motions, lab: plate groups, lecture: forces driving plate motions, lab: plate groups present, wrap-up discussion. Overview: (cid:120) today: (cid:120) day 2 (cid:120) day 3. Definitions for many things) (cid:120) earth science"s grand unifying theory (or at least, one that works very well (cid:120) from tekton (greek, builder ) (cid:120) tectonics does not necessarily equal plate tectonics. For 2 centuries, ideas had been formulated about how mountains, ocean basins, etc. are formed. Everest (!: marine sediments covering the midwestern us (recall the indiana. Canyon. (cid:120) global contraction (motivated mainly by compressional mountain ranges) (cid:120) global expansion (proposed later as an explanation for evidence of seafloor (cid:120) noah"s flood (the diluvian hypothesis ). Also works nicely for, e. g. , grand (cid:120) geosynclines (mom"s college geology textbook) (cid:120) sea level changes spreading) Wegener (german meteorologist), post-wwi, origin of oceans & continents:
