An oceanic composition on early and today's Enceladus

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

The oceanic composition on Saturn's moon Enceladus is evaluated through calculations of thermochemical equilibria at hydrothermal and freezing settings. Conditions of rock alteration are constrained from assumptions and models for the moon's interior composition and thermal evolution, and from the composition of Enceladus' plume. Results show that an early ocean was an alkaline Na+-Cl- HCO- 3 solution. Underlying altered rocks consisted of Mg-phyllosilicates, magnetite, Fe and Ni sulfides, and carbonates. Subsequent freezing of oceanic water caused the deposition of a NaCl hydrate, Na, K and Ca carbonates, and the formation of a salt-free ice shell. If an aqueous phase exists on today's Enceladus, it could consist of eutectic Na-Cl-HCO- 3 brine that at least locally decouples the ice shell and facilitates tidal heating. A lack of firm detection of Na and Cl at Enceladus is consistent with the accumulation of salts at the ice-rock boundary and implies the plume formation via sublimation in the ice shell.

Original languageEnglish (US)
Article numberL23203
JournalGeophysical Research Letters
Volume34
Issue number23
DOIs
StatePublished - Dec 16 2007

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Enceladus
ice
rocks
shell
freezing
plumes
Moon
carbonates
plume
rock
salts
salt
carbonate
thermal evolution
sublimation
phyllosilicate
Saturn
natural satellites
eutectics
hydrates

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

An oceanic composition on early and today's Enceladus. / Zolotov, Mikhail.

In: Geophysical Research Letters, Vol. 34, No. 23, L23203, 16.12.2007.

Research output: Contribution to journalArticle

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