| Abstract |
A lot of possible sources of water on the Earth have been proposed so far, and the amount of water accumulated into terrestrial planets is considered to be a fundamental question. There is a paradox of redox state of early Earth; the mantle reached its present-day oxidation state about 4,350 Myr ago while the Earth had reduced atmosphere at least 2,500 Myr ago. The oxygen concentration in the Venusian atmosphere after the escape of ocean is also a long-standing question.
In this talk, I propose a new scenario for loss and re-formation of ocean on terrestrial planets. This scenario gives us a comprehensive understanding of formation and early evolution of terrestrial planets, and solves many problems of early Earth and Venus. |
