GEO 1111 Lecture Notes - Lecture 9: Jigsaw Puzzle, Plate Tectonics, Continental Drift

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: David Schneider

Document Summary

Before theory of plate tectonics thought that early earth revolution was result of hot earth is cooling through time this is early natural sciences, geologist thought cooling = shrinking & mountains were results of contraction. Mercury never had tectonics, but result of planetary contraction because of cooling. Suggested 200 m. y. ago their existed a single supercontinent pangea. Polar wondering: glacial sediments on south america, south. Polar wondering frames of reference tectonic plates are moving! Took us 50 years for theory to be accepted. 1937 convection in the mantle as driving force (moving heat along mantle using convection) Rock deposited cooled at equator will have a sub horizontal magnetic signature, get to poles they will have steep magnetic signatures: apwp apparent polar wondering path. Similar to path shapes but separated 24 degrees in longitude. We can track were the pole was: magnetic stripes marine magnetic anomalies are bands of normal & reversed magnetic field structures.