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Today Monday Next Wednesday Pre Cambrian Geology
DUE: Coastal Geology Project Monday Paleozoic Tectonics LAB Geology of North America DUE: Choice of Fossil for Fossil Poster Next Wednesday Paleozoic Climate & Life Mesozoic Tectonics
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Outline of Pre-Cambrian Time
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Age & Origin of Earth Oldest Rocks & Minerals Archean Tectonics Origin of Atmosphere & Life
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The Oldest Terrestrial Rocks: Acasta Gneiss 4.0 billion years old!
Source: Sam Bowring/MIT
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The Oldest Rocks on Earth : Meteorites 4.5 billion years old!
Source:
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01_13and15.jpg
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Zoomable Art PC Mac 01_Featured_Art.jpg
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23_03.jpg
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Hadean: Hell on Earth? (Fig. 13-4)
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Oldest Rocks & Minerals
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Archean Crust
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World’s Oldest Rock: Acasta Gneiss 4.0 b.y. (Fig. 12-25)
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Source: http://www. gly. fsu
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World’s Oldest Mineral Grain: Zircon form Jack Hills Australia
Source:
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Australian Craton Source:
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Jack Hills Metaconglomerate
Source:
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World’s Oldest Sedimentary Rock: Isua Metasediments 3.8 b.y.
Source:
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Source: http://www.geology.wisc.edu/zircon/Earliest%20Piece/Earliest.html
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Archean Tectonics
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Why so little Archean Crust?
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Granulite/gneiss and greenstone belts
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Granulite Greenstone Belts
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Archean Pillow Basalts
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Formation of greenstone belts Arc Model
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Formation of greenstone belts Arc Model (Fig. 13-5)
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Pre-Cambrian of North America
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13_06.jpg
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For Monday 5/17 On-line Readings Early and Late Paleozoic Events
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