EESA06H3 Lecture 10: Lecture 10
Document Summary
Arctica- oldest land mass- 2. 7 ga: 2. abundant life evolves: arctica + columbia + rodinia = canadian shield (the craton, 4. Pangea assembly (350 ma): maritime canada is added during appalachians orogeny (appalachian mountains: 5. amphibolites: they sat on ocean floor, a lot of rich mineral from hot seafloor. hydrothermal processes- takes place in mid ocean ridges: magma comes up into mid ocean ridge and pushed apart by more magma, great thicknesses of pillowed basalts between blocks of continent crust. They have metals in them: rocks formed on water and been metamorphose, about 3. 3 billion years ago there were simple bacteria www. notesolution. com, found in australia, in ontario, have gunflint chert- 1. 1 ga. 1. 5 to 1 billion years ago: continents looked different then, because all of maritimes, eastern and western north. America didn"t exist: south america was colliding with this part of na- grenville orogen, group of seven painting of canadian shield now, carmicheal.
