EESA06H3 Lecture 10: Lecture 10 In Class Notes
Document Summary
Deconstruction means taking something apart and seeing how it was built and what it is made of. North american continent shows 5 growth stages: artica (2. 7 ga [giga-annum], columbia (1. 8 ga, rodinia (1. 0 ga) A + b + c = canadian shield (the craton: pangea assembly (350 ma); maritime canada is added during. Appalachians orogeny: pangea breakup (<200 ma); bc is added during cordilleran. Tom krogh was the guy who is responsible for getting this zircon age dating to a recognizable stage. Acasta gneiss is the oldest rock in canada going back to 4. 1 billion years old, but this rock has been detrital meaning that it"s a derivative of something else, hence is only been dated after it was metamorphosed. Province broad areas characterized by similar geology but by sharp boundaries, Orogen is the rock that results from the process, quick, highly deformed, like gneiss.