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Theory of Continental
Drifting1. Fit of continents2. Structural and lithologic continuities3. Fossils4. Glaciation
Paleoclimate and Continental Drifting
Polar “wandering”
Curie Point of magnetite = 580 OCmagnetic declination = angle with respect to spin axismagnetic inclination = angle with respect to horizontal surface
The way it was done…
1. Alfred Wegener’s Theory of Continental Drifting2. Identification and dating of magnetic reversals on land3. Mid-ocean ridge topography4. Identification and dating of magnetic reversals at sea5. Identification of oceanic slabs from deep foci earthquakes6. Identification of shallow foci earthquakes7. Radar altimeter measurements (topography, gravity, etc.)8. Space geodetic measurements of plate motions
The Egg Story
Tectonic Plates
Types of Plate Boundaries
Transform fault
Trench
Mid-oceanic ridge
Mechanism?
A simple Proof?
A simple test?
A simple Truth?
References/Sources of MaterialsPetals around the Rose: http://www.enc.org
Plate Tectonics: United States Geological Survey: www.usgs.govUniversity of Leeds, U.K.
Polar wandering:Sager, W. and Koppers, A., , Late Cretaceous Polar Wander of the Pacific Plate: evidence of a rapid true Polar Wander, Science, V. 287, p. 455-459 (January 2000). Kerr, R., Did the dinosaurs live on a topsy-turvy earth?, Science, V. 287, p. 406-407 (January 2000).http://www.mala.bc.ca/~earles/polar-wander-jan00.htm
Fossil, glaciation, ancient climate zones and polar wandering figures: http://www.crystalinks.com/tectonicplates.html
Mantle Plumes: Harvard University