lec 8 - GE105 Continents Adrift Continents Adrift 11 Plate...

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Unformatted text preview: GE105 Continents Adrift Continents Adrift 11 Plate tectonics collision zones Lecture 1. Introduction and course overview. Lecture 2. Distance and time. Lecture 3. Planet building and Earths layered structure. Lecture 4. Wegeners Continental Drift hypothesis. Lecture 5. Earths magnetic field and polar wander. Lecture 6. Reversals and seafloor spreading. Lecture 7. Plate tectonics spreading and rifting. Lecture 8. Plate tectonics collision zones Lecture 9. The wave that shook the world (movie) Lecture 10. Earthquakes I. Lecture 11. Earthquakes II. Lecture 12. Volcanoes and mantle convection Lecture 13. Final Exam (FEBRUARY 17, 2011) GE105 GE105 Continents Adrift GE105 Continents Adrift 22 Plate collision Plate destruction zones or plate subduction zones Mountain building Trench formation Island arcs (building blocks for continental growth) Arc volcanism (the most violent volcanic eruptions on Earth) Mega-thrust earthquakes (Magnitude > 8.5) Deep (50-700 km) earthquakes Subduction (or collision) is the process by which continents grow in size GE105 Continents Adrift GE105 Continents Adrift 33 Plate collision Deep earthquakes melting Mega-thrust earthquakes Plate Bending (flexure) Plate bending Trench formation Arc volcanism Folding of crust GE105 Continents Adrift GE105 Continents Adrift 44 Convergent boundaries: Pacific-South America Deep ocean trenches Mountain range parallel to the trench < 50 km < 150 km < 300 km < 500 km < 700 km PASSIVE MARGIN ACTIVE MARGIN GE105 Continents Adrift GE105 Continents Adrift 55 Subduction of oceanic lithosphere Mega-thrust earthquakes- failure of the strong contact between oceanic and continental lithosphere...
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lec 8 - GE105 Continents Adrift Continents Adrift 11 Plate...

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