EESA06H3 Lecture Notes - Lecture 5: Volcanic Bomb, Oceanic Crust, Transform Fault
15 Oct 2015
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Introduction to uniformitarianism : we look at old rocks, that have been moved by plate tectonics and we reconstruct environments that are paleo. A concept that will be touched on later in the lecture. We have to turn uniformitarianism around sometimes because it helps us see the environment that was only available in the ancient times and there is no example of it now. For example: earth"s field reversing, meteorite impacts: huge craters on the surface of the planet; biggest one in south africa. We also haven"t seen mega-volcanoes: what we see in terms of volcanic activity is very small scale. Even in the rocks around southern ontario have very thin ash layers and correlation shows there are thicker variations somewhere in north america. Terms are elaborated in the textbook chapter 1-4. Lithosphere: plate like on top of the asthenospehere (toffee like) Reykjanes ridge: mid-atlantic ridge coming up on land; what kind of volcanism goes on around the crack.
