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Lecture 10

Lecture 10

8 Pages

Environmental Science
Course Code
Nick Eyles

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EESA06 Lecture 10 Page 1 EESA06 Lecture 10 Canadas Geologic Journey: The Last 4 Billion Years 1. Continents grow through time by obduction 2. North American continent shows 5 growth stages: a) Arctica (2.7 Ga) oldest Giganum (Billion) b) Columbia (1.8 Ga) c) Rodinia (1.0 Ga) - a + b +c = Canadian Shield (the craton) the old hard core rocks, rigid d) Pangea assembly (350 Ma): Maritime Canada is added during Appalachians Orogeny (Appalachian Mountains) added sedimentary + highly fossil rocks e) Pangea breakup (<200 Ma): British Columbia is added during Cordilleran Orogeny (e.g. Rockies) Geology of North America known for 100 years but what put it together? Brown old hard core ( Ontario+ Quebec area) Blue apolation belt maritime Canada Zircons: 2.7 billion year old zircons Uranium + Lead dating Age rings, amount of lead in the crystals Tom crow expert on dating rocks Detrital Secondary, having be derived from something else Detritous - Garbage Acasta Gneiss (NWT): 4 billion years old near Yellowknife The oldest continental crust found so far? Zircons: from igneous rocks, weathered, zircons released, become sedimentary rock then metamorphosed into a gneiss Continents grow thru time similar to Swiss roll older stuff in the middle Deconstructing North America: 1) The original NA continent, Arctica which started to form about 2.5 billion years ago from smaller continents and was completed by about 1.9 billion years ado when old Archean cratons (ex: Slave, Nain provinces) were welded together by the Trans-Hudson Orogen and others 2) Added to the North American continent during the formation of Nena about 1.8 billion years ago after the Penokean Orogeny
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