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Lecture 10

Lecture 10 - Ch. 20, The Geological Evolution of Canada

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Environmental Science
Nick Eyles

Lecture 10 - Ch. 20, The Geological Evolution of Canada Monday, March 19, 2012 10:09 AM Exam: Based on Chapters 1-4, 11, 19, 20 and Lectures 10 and 11 (with special emphasis on plate tectonics and Ch. 20!) Geology of North America known for 100 years but what put it together?  Paradigm  Cratons - like the Canadian Shield, each continent has one, inner core of old crystaline rock, rocks that have a long history, pre-Cambrian age (6 million years)  Surrounding cover rocks (surround the craton)  Oceanic crust --> continental crust  You cannot subduct continental crust because it's not dense enough (opposite: obduct) Super continent paradigm 1. Peneplained craton and enlarged continent 2. Early rifting 3. Full ocean basin 4. Subduction zone 5. Closing ocean basin 6. Collision orogeny = A Grand Concept or A Paradigm Fig. 20.4 (ON EXAM)  You will be expected to understand how this figure 'works' for the exam!  Province: region of similar geology (e.g. Superior Province)  Terrane: sections of continent - Rockies are a result of #5 moving against #1 #3: South America left behind this crust (billion years ago) & #4 was left behind by Africa when  Pangea was forming (red rocks in Nova Scotia same as in Africa)  Slave Province was the first part of NA o Acasta gneiss (NWT): 4 billion years old, the oldest continental crust found so far? o Detritel: something that's been derived from something that's been weathered, polycyclic, reused  Fossil ocean crust, pillow basalts (evidence of oceanic crust), in North American crust  Ophiolites: umbrella term for fossil ocean crust (MORs etc.)  Hydrothermal - in pillow ba
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