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Journal Articles Nature Astronomy Year : 2022

Geologically rapid aqueous mineral alteration at subfreezing temperatures in icy worlds

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Amber Zandanel
  • Function : Author
Roland Hellmann
  • Function : Author
Laurent Truche
  • Function : Author
Vladimir Roddatis
  • Function : Author

Abstract

The most active icy worlds such as Europa or Enceladus are predicted to host extensive aqueous alteration driven by water-rock interactions at elevated temperatures1-3. 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 objects1,4. 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.
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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⟩
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