JpGU-AGU Joint Meeting 2020

Presentation information

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-GI General Geosciences, Information Geosciences & Simulations

[M-GI40] Development of computational sciences on planetary formation, evolution and surface environment

convener:Yoshi-Yuki Hayashi(Department of Planetology/CPS, Graduate School of Science, Kobe University), Masaki Ogawa(Division of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo), Shigeru Ida(Earth-Life Science Institute, Tokyo Institute of Technology), Kanya Kusano(Institute for Space-Earth Environmental Research, Nagoya University)

[MGI40-05] Attempts at numerical modeling of mantle convection of terrestrial bodies: from Moon, Earth, to super-Earths

*Masanori Kameyama1,2, Masaki Ogawa3,2, Takehiro Miyagoshi2, Takatoshi Yanagisawa2 (1.Geodynamics Research Center, Ehime University, 2.Japan Agency for Marine-Earth Science and Technology, 3.The University of Tokyo at Komaba)

Keywords:Numerical Simulations, Terrestrial planets, Mantle convection

We are developing advanced numerical models of mantle convection of solid rocks, in order to deepen the insights into the thermo-chemical evolution of the mantles of terrestrial bodies. The key ingredients in our models include the effects of mantle magmatism, plate tectonics, and adiabatic compression. The mantle magmatism is modeled by the generation of liquid phase (magma) owing to the pressure-release melting induced by ascending flows of solid-state convection and the motion of the generated magma as a permeable flow through the solid matrix driven by a buoyancy due to the density difference between the solid and the liquid phases. The coherent motion of tectonic plates is, on the other hand, helped by the narrow zones of low viscosity within the highly viscous "lithosphere" along the top cold surface generated by the stress-history-dependent rheology. In addition, the adiabatic change in temperature, which is caused by the changes in volume of fluid parcels during their vertical motion, is expected to strongly affect the convecting motion particularly in the mantles of massive super-Earths. In this presentation, we will show the current status and outcrops of our attempts, together with some examples of our experiments running on massive (super)computers.