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Lecture 10

EESA06 Lecture 10 Notes

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Environmental Science
Nick Eyles

Lecture 10 Canadas geologic journey: the last 4 billion years Dominant theme for exam is plate tectonic, chapter 20 Deconstruction, taking something apart and seeing how its built How north American got built Plate tectonic is the tool in understanding how N.A. got built Other continents are built in a similar way OUTLINE OF LECTURE (Read Chapter 20 carefully!) 1. Continents grow through time by obduction Deconstructing continents 2. North American continent shows 5 growth stages: a) Arctica (2.7 Ga)billion years ago Oldest one Zircons used for uranium lead age dating Tom Crose, lead is given first and then age is determined Oldest rock on the planet is Acosta gneiss up in the Yellowknife which is 4 billion years old That date is not technically correct because we are dating the event that made it Detrital meaning secondary, coming from the work detritious meaning garbage The rock had to be derived from something else. The earth is 4.5 billion years old Age of rocks on slide 8 Grey represents much younger rocks This map shows that the oldest rocks are all in the middle, Swiss roll Province: old term used to identify rocks which are similar in appearance such as superior province but with sharp boundaries. Orogen: the rocks that result from orogenic energy. The most common rock are high deformed, nice The provinces are separated by orogens Orogens are all the folded rocks in India, like Himalayas Provinces are like continents moving around and collide and they form separate continents and are separated by orogens which we find green stone belts which are ocean floor rocks Top left, the true core of the shield because the encastonine is found in the slave province The Yellowknife and slay area are the oldest part of NA Greenland broke off 80 mya but was part of NA, it was separated by a failed rift The earliest north American land mass, Arctica @2.52.7bya
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