English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Recent cryovolcanic activity at Occator crater on Ceres

MPS-Authors
/persons/resource/persons104104

Nathues,  Andreas
Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons238838

Schmedemann,  Nico
Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons104243

Thangjam,  Guneshwar Singh
Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;

Mengel,  K.
Max Planck Institute for Solar System Research, Max Planck Society;

Hoffmann,  M.
Max Planck Institute for Solar System Research, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Nathues, A., Schmedemann, N., Thangjam, G. S., Pasckert, J. H., Mengel, K., Castillo-Rogez, J., et al. (2020). Recent cryovolcanic activity at Occator crater on Ceres. Nature astronomy, 4(8), 794-801. doi:10.1038/s41550-020-1146-8.


Cite as: https://hdl.handle.net/21.11116/0000-0006-F964-1
Abstract
NASA’s Dawn mission revealed a partially differentiated Ceres that has experienced cryovolcanic activity throughout its history up to the recent past. The Occator impact crater, which formed ~22 Myr ago, displays bright deposits (faculae) across its floor whose origins are still under debate: two competing hypotheses involve eruption of brines from the crust–mantle transition boundary (remnants of an ancient ocean) or alternatively from a shallow impact melt chamber. Here we report new constraints on the history of Occator that help in testing the hypotheses of its formation. We used high-resolution images of the Dawn Framing Camera obtained close to the end of the mission. We found a long-lasting and recent period of cryovolcanic activity, which started ≤9 Myr ago and lasted for several million years. Several resurfacing events, affecting the faculae and some (dark) solidified impact melt units, are shown to have occurred millions of years after crater formation and the dissipation of the impact-generated heat. These findings are indicative of a deep-seated brine source. Extensive volatile-driven emplacement of bright material occurred in the central floor, causing its subsidence due to mass loss at depth. Finally, a thick (extrusive) dome of bright material was raised in the central depression. The derived chronostratigraphy of Occator is consistent with a recently geologically active world, where salts play a major role in preserving liquid in a heat-starved body.