Slurry extrusion on Ceres from a convective mud-bearing mantle

Abstract

Ceres is a 940-km-diameter dwarf planet that is predominantly composed of silicates and water ice. In Ceres’ partially differentiated interior, extrusive processes have led to the emplacement on its surface of domes with heights of kilometres. Here we report the analysis of a gravity anomaly detected by the Dawn spacecraft, which is associated with the geologically recent dome Ahuna Mons. By modelling the anomaly with a mass concentration method, we determine that the subsurface structure includes a regional mantle uplift, which we interpret as a plume. This structure is the probable source of fluids forming Ahuna Mons and, together with constraints from the dome’s morphology, indicates a rheological regime corresponding to a slurry of brine and solid particles. We propose that the properties of such a solid–liquid mixture can explain the viscous relaxation and the mineralogy of the dome. The presence of a plume and of slurry material indicate recent convection in a mud-bearing mantle. The inferred slurry extrusion on Ceres differs from the water-dominated cryovolcanism of icy satellites, and so reveals compositional and rheological diversity in extrusive phenomena on planetary surfaces.

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Fig. 1: Colocation of volcanic dome and isostatic gravity anomaly.
Fig. 2: Gravity anomaly residuals for two solutions of the mascon analysis.
Fig. 3: Mascon parameters shown as histograms of the final ensemble of solutions.
Fig. 4: Constraints on the properties of the ascending fluid.

Data availability

The data Ceres18C described in ref. 5 used in this study are available at https://sbn.psi.edu/archive/dawn/grav/DWNCGRS_2_v2/DATA/

The Ceres HAMO Digital Terrain Model described in ref. 8 used in this study is available at https://sbn.psi.edu/pds/resource/dawn/dwncfcshape.html

Code availability

The computer codes associated with this paper are presented in Methods.

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Acknowledgements

The Dawn spacecraft Operations and Flight teams made the observations possible and are acknowledged for their efforts. O.R. is supported by an appointment to the ESA Research Fellow Programme at the European Space and Technology Centre.

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O.R. conceived the study and performed the rheology analysis. A.G. developed the mascon model, and performed the gravity and MCMC analyses. W.N. performed the mantle convection analysis. L.C.Q. and J.C.C.-R. contributed to the development of the rheological and compositional concepts. C.A.R., C.T.R and M.T.Z. contributed to the discussion of the results. O.R. and A.G. wrote the initial manuscript draft. All authors edited the manuscript and approved the final version.

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Correspondence to Ottaviano Ruesch.

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Supplementary Figs. 1–6 and Supplementary Table 1

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Ruesch, O., Genova, A., Neumann, W. et al. Slurry extrusion on Ceres from a convective mud-bearing mantle. Nat. Geosci. 12, 505–509 (2019). https://doi.org/10.1038/s41561-019-0378-7

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