Events

Tuesday, October 1, 2019 - 1:00pm
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Haller Hall (102), Geo Museum, 26 Oxford St., Cambridge

Earth History and Paleobiology Seminar

Tanja Bosak, Associate Professor of Geobiology, MIT, will discuss "Reconstructing the Record of Oxygenic Photosynthesis on the Early Earth." 

The evolution of Cyanobacteria, photosynthetic microbes that split water and produce molecular oxygen, preceded the greatest biogeochemical transition that befell Earth - the addition of molecular oxygen to our planet’s atmosphere. How much time passed between the evolution of this clade and metabolism and the accumulation of oxygen in the atmosphere (the Great Oxidation Event, GOE, ~ 2.3 billion years ago) is an open question. This talk will present and evaluate textural, geochemical and molecular evidence for the presence of oxygenic photosynthesis more than 0.5 billion years before the GOE. Discrepancies between the long pre-GOE cyanobacterial presence and the first diagnostic cyanobacterial fossils will be discussed in the light of recent experiments that suggest an increased silicification potential of marine cyanobacteria in sulfate-rich seawater.

 

 

Contact Name: 

Sabinna Cappo

Research Areas: 

Harvard University
Center for the Environment

Address: 26 Oxford Street, 4th Floor, Cambridge
Email: huce@environment.harvard.edu
Phone: (617) 495-0368

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