EAS201 Lecture Notes - Lecture 2: Plate Tectonics, Aulacogen, Subduction
20 Sep 2016
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Document Summary
Convection cells in the mantle solid material, but it still convects very slowly driving mechanism is the heat. East africa, where the african plate is splitting up in three parts, and these incipient divergent plate margins quite often are the shape of a y (one arm branches into two) Failed rift arm = aulacogen (one of these arms dies) Convergence 1 oceanic crust converging on oceanic crust. Back-arc basin might exist for a long time, or it might close. Convergence 3 collision. two continents slam into each other. Just get a big clump of material where the collision is. Biggest mountain chains in the world are a result of collision. India landmass (71 mill years ago) moves to where it is today. Transform fault: left motion on one side, right motion on the other. He did not know what was under the crust however, core idea was right. Evidence 1: he fit continents together, supercontinent pangea (wegener.
