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603-pp6 - UNIVERSITY OF SOUTH ALABAMA Last time we covered...

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1 MAS 603: Geological Oceanography MAS 603: Geological Oceanography Lecture 6: Proterozoic Geology Lecture 6: Proterozoic Geology UNIVERSITY OF SOUTH ALABAMA UNIVERSITY OF SOUTH ALABAMA Last time we covered Last time we covered… 1) Hydrothermal vents (Jaime) 1) Hydrothermal vents (Jaime) 2) Caribbean Plate tectonics (Zeb) 2) Caribbean Plate tectonics (Zeb) Today’s Agenda Proterozoic Geology 1) The Proterozoic time frame 2) Paleogeography 3) Tectonics 4) Paleoclimatology 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 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 The Proterozoic Eon 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 • Paleo- old • Meso-middle • Neo-new
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2 Shield: very old (>2.5 GA) igneous and metamorphic “basement” rocks (Granulites) Platform: younger (550 MA-2.5 GA) sedimentary rocks The Canadian Shield http://mmsd1.mms.nrcan.gc.ca/efab/images/slide1canMap_e.gif This is about as far back as we can go with detailed paleogeography Proterozoic Paleogeograpy Neoproterozoic 650 MA But we can “guestimate” back to about 1 GA Proterozoic Paleogeograpy Rodinia (the first supercontinent) The Earth 1.0 GA As far as we can tell, there was no modern plate tectonics prior to the early Proterozoic. Proterozoic Paleogeograpy Rigid lithospheric plates “float” atop ductile asthenosphere Modern Plate Tectonics The first evidence of divergent and convergent plate tectonics was during the Paleoproterozoic (2.1 GA) in the Slave Province of the Canadian Shield Proterozoic Tectonics
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3 The first evidence of divergent and convergent plate
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