Bright carbonate surfaces on Ceres as remnants of salt-rich water fountains

O. Ruesch, L. C. Quick, M. E. Landis, M. M. Sori, O. Čadek, P. Brož, K. A. Otto, M. T. Bland, Shane Byrne, J. C. Castillo-Rogez, H. Hiesinger, R. Jaumann, K. Krohn, L. A. McFadden, A. Nathues, A. Neesemann, F. Preusker, T. Roatsch, P. M. Schenk, J. E.C. ScullyM. V. Sykes, D. A. Williams, C. A. Raymond, C. T. Russell

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Vinalia and Cerealia Faculae are bright and salt-rich localized areas in Occator crater on Ceres. The predominance of the near-infrared signature of sodium carbonate on these surfaces suggests their original material was a brine. Here we analyze Dawn Framing Camera's images and characterize the surfaces as composed of a central structure, either a possible depression (Vinalia) or a central dome (Cerealia), and a discontinuous mantling. We consider three materials enabling the ascent and formation of the faculae: ice ascent with sublimation and carbonate particle lofting, pure gas emission entraining carbonate particles, and brine extrusion. We find that a mechanism explaining the entire range of morphologies, topographies, as well as the common composition of the deposits is brine fountaining. This process consists of briny liquid extrusion, followed by flash freezing of carbonate and ice particles, particle fallback, and sublimation. Subsequent increase in briny liquid viscosity leads to doming. Dawn observations did not detect currently active water plumes, indicating the frequency of such extrusions is longer than years.

Original languageEnglish (US)
JournalIcarus
DOIs
StateAccepted/In press - Jan 1 2018

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ruesch, O., Quick, L. C., Landis, M. E., Sori, M. M., Čadek, O., Brož, P., Otto, K. A., Bland, M. T., Byrne, S., Castillo-Rogez, J. C., Hiesinger, H., Jaumann, R., Krohn, K., McFadden, L. A., Nathues, A., Neesemann, A., Preusker, F., Roatsch, T., Schenk, P. M., ... Russell, C. T. (Accepted/In press). Bright carbonate surfaces on Ceres as remnants of salt-rich water fountains. Icarus. https://doi.org/10.1016/j.icarus.2018.01.022