Host: Abstracts of Annual Meeting of the Geochemical Society of Japan
Name : Abstracts of Annual Meeting of the Geochemical Society of Japan
Number : 68
Date : September 01, 2021 - September 15, 2021
Pages 111-
Summarizing the results of geological, mineral physics, geophysical and geochemical observations, I will present a model to explain the inferred spatial distribution of water (hydrogen) in the mantle and the long-term stability of the ocean mass. Studies of the sea level show that although fluctuation is large, average sea level has been stable for the last ~600 Myrs. Also based geophysical and geochemical observations suggest that the water (hydrogen) content has a peak in the mantle transition zone. I will present a model to explain these observations assuming the whole mantle convection. A key is partial melting that likely occurs both above and below the transition zone. Partial melting at these depths promotes large scale transport of water and provides a mechanism to accumulate water in the transition zone and stabilizes the ocean mass.
