EESA06H3 Lecture Notes - Lecture 10: Grenville Orogeny, Supercontinent Cycle, Oceanic Crust
Document Summary
Lec 10: march 14, 2016 canada"s geologic journey. Superconinent cycle (500 million years long) paradigm" or tool" kit to examine earth history: next superconinent will form in about 250 million years, dispersive phase right now, 6 stages. Peneplained craton and enlarged coninent, early riting, full ocean basin, subducion zone, closing ocean basin, collision orogeny. Never closes in the same spot because the oceanic crust grows. Geology of na was known for 100 years, but what processes put it together: cover rocks: newer rocks that cover canadian shield, it actually extends way down into. Added to na coninent during the formaion of nena about 1. 8 billion years ago ater the penokean orogeny. Added during the formaion of rodinia about 1. 3 billion years ago during the. Added during the formaion of pangea about 600 million-300 million years ago. Obducion collision of coninents together, crustal thickening, the way coninents get bigger through ime.
