EESA06H3 Lecture 9: ESSA06 Lecture 9 Notes
9 Oct 2017
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Eesa06 lecture 9: canada"s geological journey ~ the. Appalachians orogeny (appalachian mountains: added most of eastern canada, 5) pangea breakup (<200 ma): british columbia is added during. What out the geology of na together: plate tectonics. Zircons: they are produced in magmas and they are interesting bc they contain. Ur-isotopes: once lead is produced inside the crystal it is tight and it can"t escape, in other crystals not accurate bc they let the lead leak out. 3: in 4 billions years, the world would be mostly continental crust through the process of subduction basalt, andesite. Origin of life: said that it began 4. 2 billion years ago, bacteria 3. 3 ga, big increase in organisms 1. 1 ga bc of increase of atmospheric oxygenation. Uniformitarianism: the present is the key to the past, but that doesn"t work all the time because we haven"t seen everything that has happened in the past to happen now, ex. major asteroid impact.
