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EESA06H3 (540)
Nick Eyles (472)
Lecture 10

Lecture 10

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University of Toronto Scarborough
Environmental Science
Nick Eyles

Lecture 10 J L[Z}o}2] :}[email protected]>Z ]oo]}LzZ K[Z}K]LLZK 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 J embedded in the interior of continents - Begins to get younger as the land disperses
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