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Lecture 10

Lecture 10 – Planet Earth.docx

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Environmental Science
Nick Eyles

Lecture 10 – Planet Earth - all the continents are constructed in a similar fashion Slide 1: - read properly - gigaanam (Ga) - craton is core of north American - martime is added when pangea is forming - western Canada added after pangea breaks up - mostly sedimentary rocks added on Eastern and Western Canada Slide 2: - blue > is apalasian belt - red > craton Slide 5: - zircons [2.7bys] > used for uranium lead dating > can’t say much about geological area w/o knowing age of age o new method Slide 6: - zircon > analyze it to know how much lead is there > help determine age Slide 7: - Acasta Gneiss > 4bya oldest crust found in Canada - we’re only dating since when it was a gneiss > was a rock before that too - detrital > having been derived from something else - zircons originate in igneous rock then get weather > released in water become metaphoric rock > gneiss Slide 8 [diagram]: - oldest rock Napier Complex - oldest rock in the middle o old rocks are embedded in the interior of continents Slide 9: - province > rock that have extended over a long period of time o broad areas characterized by similar properties but have sharp boudaries - most common rock type found with orgen > gneiss - provinces were microcontinents > microcontinents collided > separated by oregens - Greenland was apart of the NA continents then separated about 80mya - arctica > oldest NA landmass > 2.5-2.7 bya - nina Columbia > second growth stage - 3. basement rocks gotta added at this time - 1,2,3 > craton - cordilleran > added during the breakup of pangea - 5 parts to NA geology Slide 10: - Lithoprobe o means ‘probing rocks’ o equipment is called dancing elephants o enables us to see 70km deep o purpose was to understand the structure of the Canadian shield o developed > seismic transects  would come up with cross sections Slide 12: - take home msg form diagram o the ancient Earth behaved in the same way as the modern Earth does o diagram depicts > uniformitarianism > the present is the key to the past o past may have moved faster/thinner > because earth is cooler now - the Canadian shield is what is called > Pemeplain [means almost a plane] o the shield is generally flat Slide 13: - ‘golden spike’ > Canadian Pacific Railroad Slide 14: - obduction > results in the building of cratons [cratonization] Slide 15: - each province was build by a smaller scale obduction - greenstone belts > green rocks > metamorphosed basalts o sometimes called > amphibolite - process by which rocks become mineral rich on the magma rich areas of the ocean floor > hydrothermal processes Slide 17: - find simple cater 3bya - gunflint chert 1.1 bya - stromatolites > circular masses
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