112-pp20(1)

112-pp20(1) - 1 Quiz 6 10:10-10:15AM GY 112 Earth History...

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Unformatted text preview: 1 Quiz 6 10:10-10:15AM GY 112: Earth History Proterozoic Climate UNIVERSITY OF SOUTH ALABAMA Today’s Agenda (long!) Proterozoic Tectonics 1) The Proterozoic time frame 2) Paleogeography 3) Tectonics 1 (Wopmay Orogeny) 4) Other “orogenies” 5) Diamonds (web notes only) (Web Lectures 18, 19) The Proterozoic Eon 4.6 GA to 4.1 GA Hadean 4.1 GA to 2.5 GA Archean 2.5 GA to 550 MA Proterozoic 550 MA to 0 MA Phanerozoic Time Eon 2.5 GA to 1.6 GA Paleoproterozoic 1.6 GA to 900 MA Mesoproterozoic 900 MA to 550 MA Neoproterozoic Age Division (ERA) • Paleo- old • Meso-middle • Neo-new • But we can “guestimate” back to about 1 GA Proterozoic Paleogeograpy Rodinia (the first supercontinent) The Earth 1.0 GA Proterozoic Tectonics • A paleogeographic reconstruction of the Coronation Geosyncline 2.1 GA would look like this: 2 • In any triple junction, one of the “arms” will become a failed rift or an Aulcogen. Two will continue to spread into an ocean Proterozoic Tectonics • This is now called the Wilson Cycle in honor of J. Tuzo Wilson who first suggested it for the Atlantic Ocean Other Proterozoic Orogenies And starting in the Paleoproterzoic, orogenies became very common around the world. Grenville Orogeny 1.0 GA Section Line Today’s Agenda The Proterozoic Part 3 (web notes 20) 1) Glaciations: what happens and why 2) Glaciations in the Proterozoic 3) Snowball Earth Hypothesis (neato cool!) (Web notes 20) Proterozoic Climate Neoproterozoic 650 MA There is something similar about the Neoproterozoic and Modern Earth… 3 Proterozoic Climate Neoproterozoic 650 MA There is something similar about the Neoproterozoic and Modern Earth… Ice caps at the poles Modern Climate There is something similar about the Neoproterozoic and Modern Earth…...
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112-pp20(1) - 1 Quiz 6 10:10-10:15AM GY 112 Earth History...

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