EESA06H3 Lecture 10: Lecture 10 Notes
Document Summary
Eesa lecture 10: deconstructing: taking something apart and seeing what it"s made of. We now have the tools to be able to do this for understanding how continents were built. All continents are built similarly: most important process is obduction, we can recognize five main growth stages, the oldest one is arctica (2. 7 ga) then. Columbia (1. 8 ga) rodinia abundant life arrives at this time (1. 0 ga [ga=giga annum) these three are the canadian shield (the craton=the core of north america). Pangea assembly (350 ma): maritime canada is added during. Appalachians orogeny (appalachian mountains), pangea breakup (<200 ma) British columbia is added during cordilleran orogeny (eg. rockies). You can go anywhere in the world and use this 5 part scheme. The shield on this map is the brown rocks. Then blues and lime greens wrapped around this core, the blue area on the right hand side is the appalachian belt.
