11:680:390 Lecture Notes - Lecture 10: Hydrothermal Vent, Stromatolite, Photosynthesis
13 Mar 2018
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Document Summary
Black smoker: precipitate formed when elements come into contact with oxygen-rich sea water. Chimneys: porous structure formed when precipitate accumulates; fantastic environment for catalysis: photosynthesis and the oxidation of earth. Precipitate material created fossilized and contemporary stromatolites. The rise of o 2 (1) oxygenic photosynthesis and cyanobacteria ~3 billion years ago (2) for the first 300 million years, no increase in atmospheric. O 2 (3) first o 2 oxidized reduced compounds on earth (banded iron formation: alternating iron silicates and iron oxide deposits) the great oxidation event increased o 2 in atmosphere gradually. What three arguments support the identification of deep-sea hydrothermal vents as a site where life on earth started. Large surface area where to facilitate catalysis and assembly of cellular entities. Living fossils: dna records the history of life. Luca: origin of life based on processes of life that make all organisms: endosymbiotic origin of eukaryotes.
