Title：Carbon Cycle on Tectonic Time Scale and the Earth’s Habitabilit
Date：Monday ,October 17, 2016 15:30
Address：Conference Building, No.8 room, Tianjin University, 92 Weijin Road
Speaker：Professor LI Gaojun
Gaojun Li，professor and doctoral supervisor from School of Earth Sciences and Engineering, Nanjing University , who gained the National Nature Scince Fund “Outstanding Youth Fund”.Currently, he as first author and reporter published more then 30 SCI paper on International journals like Nature、Geochimica et Cosmochimica Acta,Earth and Planetary Science Letters,Geology,Global Biogeochemical Cycles and so on.
Abstract
Why is the earth habitable for life since at least 3.8 billion years ago while luminosity of the sun have increased by 25% The interaction between silicate weathering and carbon cycle may have played a central role because liquid water is vital for weathering reaction. This talk will provide evidences from small basaltic catchments and deep time weathering tracers to prove the negative feedbacks between silicate weathering and the concentration of carbon dioxide in atmosphere. I will also show how weathering feedbacks have saved the Earth from Cenozoic cooling and snow ball glaciation. Finally, I will propose a hypothesis regarding why there are only two snowball earth periods.
