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13 History of the Earth, Part 1

13 History of the Earth, Part 1 - History of the Earth Part...

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History of the Earth, Part 1
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01_Featured_Art.jpg Zoomable Art PC Mac
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Early Earth: we already know a lot Accretion: Bombardment by meteorites Sphericity Differentiation Formation of moon Formation of magnetic field
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Hadean Eon Lot of Igneous rocks Outgassing of volatiles Formation of atmosphere Towards end: sedimentary rocks Oceans?
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Archean Eon End of bombardment
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Beginnings of ‘crust’ Is it Plate Tectonics?
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Proto-continents … then Cratons
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First Life Undisputed signs of life Stromatolites: algal mats 3.2 Ga ago
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Other Early life? Anoxic environments: black smokers Photosynthesis -> need sunlight, creates Oxygen Oxygen burning -> needs oxygen environment
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13_08.jpg Proterozoic Eon •Continental crust almost as big as today •Some continental interiors form-away from collision zones
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Cratons formed Shields: broad low-lying regions Platforms: covered by sedimentary rocks
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Accretionary orogens
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‘First’ Supercontinent Rodinia Baltimore gneiss 1Ga Grenville orogen 800-600 Ma Rifting -> proto-Atlantic formed
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13_11.jpg
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