ERS120H5 Lecture Notes - Lecture 19: Archean, Rodinia, Great Oxygenation Event
23 Oct 2017
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Document Summary
Liquid water and dissolved co2 by 3. 85 ga: starting to detoxify the atmosphere. Archean and proterozoic life: first chemical evidence of life: ~3. 8 ga, oldest bacterial cell fossils: ~3. 5 ga, first stromatolites: ~3. 2 ga. Supercontinent cycle: collision, supercontinent, rifting, divergence, convergence. Oxygenation of the atmosphere (driven by respiration of cyanobacteria: 0. 000000001% of the atmosphere was composed of oxygen 3. 5 ga, 2. 5 ga, was the great oxygenation event. Snowball earth: runaway icehouse effect based on changes in co2, up to 4 major snowball events between 750 and 580 ma. Late precambrian (600 ma: supercontinent rodinia, continued to breakup throughout 600-540 ma. Early cambrain (540 ma: cambrian explosion , triobites, coral, brachiopod, nautiloid, trilobite. Late cambrian (500 ma: continued breakup of rodinia, passive margin, warm and shallow seas. Middle ordovician (475 ma: passive margin on west coast, subduction on east coast, warm and shallow seas. Late ordovician (450 ma: first land plants liverworts and ferns.
