EESA06H3 Lecture Notes - Lecture 10: Alleghanian Orogeny, Acasta Gneiss, Continental Crust
Document Summary
Introduction to planet earth lecture 10 canada"s. Final exam lecture 10, 11 and ch 15 and 20. A) continents grow through time b north america continent has grown in 5 stages. 2)nena 2 billion years ago through each of the phases crust was added to north america. 3)rodinia southern part mexico added to north america during rodinia all three creates cration creation of (canadian shield: pangea assembly added maritime canada is added during appalachians orogeny (appalachian mountains) 5)pangea breakup british colombia added during cordilleran orogeny. We can use zircons to date every accurately remote events and very old rocks. This is a little bit of revision form the last lecture crystal will grow during orogenic events, can read tectonic activity in crystal itself. Lithoprobe making our own earthquakes so we can map what is underneath. Oldest rocks anywhere on the planet are dark altogether makeup shields. Original continents were small that have grown over time, grown through accretion-to add crust.
