EESA06H3 Lecture 10: Lecture 10 Notes
Document Summary
Canada"s geologic journey- the last 4 billion years. Outline of lecture: (read chapter 20) continents grow through time by obduction. north american continent shows 5 groth stages. arctica, columbia and rodinia make up the canadian shield (the craton) pangea assembly 350 ma: maratime canada is during appalachian orogeny (appalachian. pangea breakup <200 ma: british columbia is added during cordilleran orogeny (eg. rockies) the canadian shield is the core of canada. the breakthrough has been our ability to date things. tom krogh was an expert on dating rocks. acasta gniess (nwt) is over 4. 1 billion years old and are the oldest rocks found in canada. However technically it is not because it has gone through metamorphosis therefore there was once an older rock. detrital- is related to detritus which is basically garbage. Detrital means having been derived from something else.
