Today Monday Next Wednesday Pre Cambrian Geology

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Presentation transcript:

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

Outline of Pre-Cambrian Time

Age & Origin of Earth Oldest Rocks & Minerals Archean Tectonics Origin of Atmosphere & Life

The Oldest Terrestrial Rocks: Acasta Gneiss 4.0 billion years old! Source: Sam Bowring/MIT

The Oldest Rocks on Earth : Meteorites 4.5 billion years old! Source: http://www-curator.jsc.nasa.gov/outreach1/expmetmys/slideset/Slides16-20.htm http://pds.jpl.nasa.gov/planets/captions/smallbod/iron.htm

01_13and15.jpg

Zoomable Art PC Mac 01_Featured_Art.jpg

23_03.jpg

Hadean: Hell on Earth? (Fig. 13-4)

Oldest Rocks & Minerals

Archean Crust

World’s Oldest Rock: Acasta Gneiss 4.0 b.y. (Fig. 12-25)

Source: http://www. gly. fsu

World’s Oldest Mineral Grain: Zircon form Jack Hills Australia Source: http://www.geology.wisc.edu/zircon/Earliest%20Piece/Earliest.html

Australian Craton Source: http://earthobservatory.nasa.gov/Study/Zircon/

Jack Hills Metaconglomerate Source: http://www.geology.wisc.edu/zircon/Earliest%20Piece/Earliest.html

World’s Oldest Sedimentary Rock: Isua Metasediments 3.8 b.y. Source: http://news.bbc.co.uk/2/hi/science/nature/3321819.stm

Source: http://www.geology.wisc.edu/zircon/Earliest%20Piece/Earliest.html

Archean Tectonics

Why so little Archean Crust?

Granulite/gneiss and greenstone belts

Granulite Greenstone Belts

Archean Pillow Basalts

Formation of greenstone belts Arc Model

Formation of greenstone belts Arc Model (Fig. 13-5)

Pre-Cambrian of North America

13_06.jpg

For Monday 5/17 On-line Readings Early and Late Paleozoic Events

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