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Lecture 10

Lecture 10

8 Pages

Environmental Science
Course Code
Nick Eyles

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Lecture 10 Canadas Geologic Journey: The Last 4 Billion Years Exams dominant theme Plate tectonics 1. Continents grow through time by obduction 2. North American continent shows 5 growth stages: a. Arctica (2.7 Ga gigaannum) b. Columbia (1.8 Ga) c. Rodina (1.0 Ga) Part of human life a + b + c = Canadian Shield (the craton core of North America: BROWN AREA) d. Pangea assembly (350 Ma): Maritime Canada is added during Appalachians Orogeny (Appalachian Mountains: BLUE RIGHT AREA) e. Pangea breakup (<200 Ma): British Columbia is added during Cordilleran Orogeny (e.g. Rockies: from Alaska to Mexico on the left) Zircons Derive from igneous rocks released into water Sedimentary rock metamorphosed into a gneiss used for uranium, lead age dating 2.7 billion years old very small put into a mass spectrometer to look at how much lead is in the crystal Oldest rock on the planet Acasta gneiss (North West Territories) 4 billion years ld Gneiss has been metamorphosed Detrital Detritus o Derived from something else eroded Continents Grow through Time INSERT MAP Oldest rocks in the centre embedded in the interior of Begins to get younger as the land disperses
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