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Conditions for the Long-Term Preservation of a Deep Brine Reservoir in Ceres

Journal
Date Issued
2019
Author(s)
Castillo-Rogez, Julie C.
•
Hesse, M. A.
•
•
Sizemore, H.
•
Bland, M.
•
Ermakov, A. I.
•
Fu, R. R.
DOI
Abstract
We propose a new internal evolution model for the dwarf planet Ceres matching the constraints on Ceres' present internal state from the Dawn mission observations. We assume an interior differentiated into a volatile-dominated crust and rocky mantle, and with remnant brines in the mantle, all consistent with inferences from the Dawn geophysical observations. Simulations indicate Ceres should preserve a warm crust until present if the crust is rich in clathrate hydrates. The temperature computed at the base of the crust exceeds 220 K for a broad range of conditions, allowing for the preservation of a small amount of brines at the base of the crust. However, a temperature ≥250 K, for which at least 1 wt.% sodium carbonate gets in solution requires a crustal abundance of clathrate hydrates greater than 55 vol.%, a situation possible for a narrow set of evolutionary scenarios.
Volume
46
Issue
4
Start page
1963
Uri
Url
Issn Identifier
0094-8276
Ads BibCode
2019GeoRL..46.1963C
Rights
open.access
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