[MIS18-P09] Water-rock reactions and habitability in Solar System bodies
Meanwhile, the Solar System exploration since 1960s have revealed the presences of liquid subsurface oceans within icy satellites of Saturn and Jupiter, liquid water beneath the ground of Mars, and vast oceans on Mars in the past. Furthermore, it was recently elucidated that hydrothermal activities are going on at the seafloor of Enceladus’ subsurface ocean. Such aquaplanets have recently attracted much attention in terms of their habitability and even the presence of extraterrestrial life forms there. Therefore, we apply the experimental and modeling methods developed for the researches on terrestrial hydrothermal systems to the water-rock interfaces in the aquaplanets.
Here we show the preliminary results of the thermodynamic modeling and experiments of water-rock reactions, simulating the past and present hydrothermal alterations/weathering in the Solar System bodies such as Enceladus, Ceres, Mars and the parent body of asteroid Ryugu (the target of Hayabusa2). The results provide the mineral assemblages and the composition of hydrothermal fluids, which will be available for the constraints on energetic habitability in hydrothermal systems in the aquaplanets and for the prediction of observations in future explorations.