Japan Geoscience Union Meeting 2022

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS17] Aqua planetology

Wed. May 25, 2022 3:30 PM - 5:00 PM 105 (International Conference Hall, Makuhari Messe)

convener:Yasuhito Sekine(Earth-Life Science Insitute, Tokyo Institute of Technology), convener:Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Tomohiro Usui(Japan Aerospace Exploration Agency), convener:Takazo Shibuya(Japan Agency for Marine-Earth Science and Technology), Chairperson:Tomohiro Usui(Japan Aerospace Exploration Agency), Takazo Shibuya(Japan Agency for Marine-Earth Science and Technology), Hidenori Genda(Earth-Life Science Institute, Tokyo Institute of Technology), Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Yasuhito Sekine(Earth-Life Science Insitute, Tokyo Institute of Technology)

4:00 PM - 4:15 PM

[MIS17-09] solubility of Magnesium Carbonate: Scarcity of Magnesium Carbonate on Mars

*TAKUMA KITAJIMA1, Keisuke Fukushi2 (1.Kanazawa university, 2.The Institute of Nature and Environmental Technology, Kanazawa University)

Keywords:Amorphous Magnesium Carbonate, Solubility

Recent advances in in-situ chemical and mineralogical analyses by exploration rovers and high-resolution remote-sensing data by orbiters have revealed the existence of widespread valley network, deltas, lake deposits, clay minerals and evaporates on the across Noachian and Hesperian crust. The valley network, closed-lakes and lake deposits on early Mars suggest the climate was cold and semi-arid. Also, the atmosphere of early Mars included high CO2 pressure and the temperature is maintained by greenhouse effect gas, such as CO2, H2 and CH4.
Since the crust of Mars is basaltic rock, Fe carbonates and Mg carbonates are preferentially formed by water-rock reactions under high CO2 pressure. However, the distribution of authigenic carbonate formation in Mars surface is scarce. In this study, we focused on amorphous magnesium carbonate (AMC), a precursor of crystalline Mg carbonates, instead of stable magnesite which is generally considered to be produced. We conducted the experiments to estimate the solubility of AMC at low temperatures. The estimated solubility was used to discuss the formation of Mg carbonates in dissolved basaltic rocks water (river of early Mars) under early Martian atmospheric conditions.