Proterozoic - Proterozoic 2.5bya-540mya Proterozoic...

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3/3/11 1 Proterozoic 2.5bya-540mya Proterozoic compared to Archean.. Proterozoic has a more “modern type of plate tectonics, sedimentation, and climate. First major Wilson cycle. First large ice age –most of Earth cooled. Most BIFs. 42% of Earth’s history! Proterozoic day NOT the same as today’s day – about 18 hours long. BUT year was >400 days! How do we know? Heliophyllum . Earth is slowing down. Evidence for longer day Proterozoic • Paleoproterozoic – 2.5-1.6 byr • Mesoproterozoic – 1.6-1.0 byr • Neoproterozoic – 1.0 byr - Paleozoic PALEOPROTEROZOIC Highlights First ice age Increase of Oxygen High amount of Plate Tectonics
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3/3/11 2 First supercontinents • Laurentia • Rodinia Evidence of Wilson cycle Opening of an ocean basin Sedimentation along continental margins Closing of an ocean basin WOPMAY OROGENY Wopmay orogeny Wopmay evidence Early North America Formation of North America
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3/3/11 3 4 stages for North America 1- 2 byr- several small Archean granitic continents accreted together. 2- ~ 1.5 byr, Siberia and possibly Australia & Antarctica were fused to western N.A. and Baltica (the Scandinavian nucleus of Europe) was converging with Eastern N.A. They collided ~ 1.2 byr Another continent of unknown size -Mazatzal, was converging from the south to make a supercontinent about 1.3-1.4 byr.
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