lec 7 - GE105 Continents Adrift Continents Adrift 11 Plate...

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Unformatted text preview: GE105 Continents Adrift Continents Adrift 11 Plate tectonics – spreading and rifting Lecture 1. Introduction and course overview. Lecture 2. Distance and time. Lecture 3. Planet building and Earth’s layered structure. Lecture 4. Wegener’s Continental Drift hypothesis. Lecture 5. Earth’s 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 Harry Hess and sea floor spreading GE105 Continents Adrift GE105 Continents Adrift 33 Modern plate tectonics (Hess/Dietz) • New sea floor forms at the mid-ocean ridge and oceans grow wider • Old oceanic floor sinks into the mantle at convergence zones • Continents simply go with the flow. • Arc volcanism • Sea floor deepening away from ridges • Deep earthquakes • Cycling of oceanic sea floor Pacific Ocean South America Atlantic Ocean Africa GE105 Continents Adrift GE105 Continents Adrift 44 Cycling of oceanic crust (lithosphere) MANTLE LITHOSPHERE Continents simply go with the flow. GE105 Continents Adrift GE105 Continents Adrift 55 Why continents do not participate in recycling? Continents are comprised of the lightest rock on Earth ( ρ = 2.6 g/cc in contrast to ρ =3.3 g/cc for rocks in the mantle) Continental rocks are formed as a result of differentiation (i.e....
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This note was uploaded on 02/17/2011 for the course GEOSCI 105 taught by Professor Ritsema during the Winter '11 term at University of Michigan.

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lec 7 - GE105 Continents Adrift Continents Adrift 11 Plate...

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