Geologically rapid aqueous mineral alteration at subfreezing temperatures in icy worlds

Amber Zandanel , Roland Hellmann , Laurent Truche , Vladimir Roddatis , Michel Mermoux (1) , Gaël Choblet (2) , Gabriel Tobie (2)

1 USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc
2 LPG - Laboratoire de Planétologie et Géodynamique [UMR 6112]

The most active icy worlds such as Europa or Enceladus are predicted to host extensive aqueous alteration driven by water-rock interactions at elevated temperatures^1-3. On the other hand, it is assumed that such alteration is kinetically inhibited at the subzero temperatures of other icy worlds, such as the mid-sized moons of Saturn and Uranus or trans-Neptunian objects^1,4. Here we perform aqueous alteration experiments on a chondrite-analogue material (olivine) and find that chemical alteration processes are still efficient at temperatures as low as −20 °C, as the presence of an unfrozen water film still allows olivine to dissolve in partially frozen alkaline solutions. We infer that aqueous alteration may be enhanced by salts and ammonia present in icy worlds, and therefore remains a geologically rapid process even at subzero temperatures. Our results imply that the primary chondritic minerals in most icy bodies exceeding 400-500 km in diameter will be completely altered to hydrous secondary minerals early in their evolutionary histories.

Domains: Sciences of the Universe [physics]

Amber Zandanel, Roland Hellmann, Laurent Truche, Vladimir Roddatis, Michel Mermoux, et al.. Geologically rapid aqueous mineral alteration at subfreezing temperatures in icy worlds. Nature Astronomy, 2022, 6 (5), pp.554-559. ⟨10.1038/s41550-022-01613-2⟩. ⟨insu-03663666⟩