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Impact-driven mobilization of deep crustal brines on dwarf planet Ceres

Raymond, C. A. and Ermakov, A. I. and Castillo-Rogez, J. C. and Marchi, S. and Johnson, B. C. and Hesse, M. A. and Scully, J. E. C. and Buczkowski, D. L. and Sizemore, H. G. and Schenk, P. M. and Nathues, A. and Park, R. S. and Prettyman, T. H. and Quick, L. C. and Keane, J. T. and Rayman, M. D. and Russell, C. T. (2020) Impact-driven mobilization of deep crustal brines on dwarf planet Ceres. Nature Astronomy, 4 (8). pp. 741-747. ISSN 2397-3366. https://resolver.caltech.edu/CaltechAUTHORS:20200811-114716572

[img] Image (JPEG) (Extended Data Fig. 1: Isostatic gravity anomaly for degrees n=1 to local degree strength4 including XM2 high-resolution data) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 2: Degree strength and isostatic anomaly maps through Hanami Planum) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 3: Posterior distributions resulting from MCMC modeling of gravity field from n=1 to local degree strength beneath Hanami planum) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 4: Posterior distribution resulting from MCMC modeling of gravity field from n=1 to local degree strength beneath the Occator crater region) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 5: Effect of the impact on the region predicted by hydrocode model) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 6: Thermal model for the Hanami planum region assuming a thermal gradient of 2.73 K/km) - Supplemental Material
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[img] Image (JPEG) (Extended Data Table 1: Results of MCMC modelling) - Supplemental Material
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[img] Image (JPEG) (Extended Data Table 2: Bounds on the model parameters for the Hanami Planum MCMC runs) - Supplemental Material
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[img] Image (JPEG) (Extended Data Table 3: Bounds on the model parameters for the Occator SE MCMC runs) - Supplemental Material
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[img] Image (JPEG) (Extended Data Table 4: The model parameters for the Hanami Planum and Occator SE representative models shown in Figure 2) - Supplemental Material
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Abstract

Ceres, the only dwarf planet in the inner Solar System, appears to be a relict ocean world. Data collected by NASA’s Dawn spacecraft provided evidence that global aqueous alteration within Ceres resulted in a chemically evolved body that remains volatile-rich. Recent emplacement of bright deposits sourced from brines attests to Ceres being a persistently geologically active world, but the surprising longevity of this activity at the 92-km Occator crater has yet to be explained. Here, we use new high-resolution Dawn gravity data to study the subsurface architecture of the region surrounding Occator crater, which hosts extensive young bright carbonate deposits (faculae). Gravity data and thermal modelling imply an extensive deep brine reservoir beneath Occator, which we argue could have been mobilized by the heating and deep fracturing associated with the Occator impact, leading to long-lived extrusion of brines and formation of the faculae. Moreover, we find that pre-existing tectonic cracks may provide pathways for deep brines to migrate within the crust, extending the regions affected by impacts and creating compositional heterogeneity. The long-lived hydrological system resulting from the impact might also occur for large impacts in icy moons, with implications for creation of transient habitable niches over time.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1038/s41550-020-1168-2DOIArticle
https://rdcu.be/b6cuIPublisherFree ReadCube access
https://sbn.psi.edu/pds/resource/dawnRelated ItemPlanetary Data System
ORCID:
AuthorORCID
Raymond, C. A.0000-0002-4213-8097
Marchi, S.0000-0003-2548-3291
Johnson, B. C.0000-0002-4267-093X
Hesse, M. A.0000-0002-2532-3274
Scully, J. E. C.0000-0001-7139-8050
Buczkowski, D. L.0000-0002-4729-7804
Sizemore, H. G.0000-0002-6641-2388
Schenk, P. M.0000-0003-1316-5667
Nathues, A.0000-0002-6285-0292
Park, R. S.0000-0001-9896-4585
Prettyman, T. H.0000-0003-0072-2831
Keane, J. T.0000-0002-4803-5793
Rayman, M. D.0000-0002-0136-2009
Russell, C. T.0000-0003-1639-8298
Additional Information:© 2020 Springer Nature Limited. Received 12 September 2019. Accepted 02 July 2020. Published 10 August 2020. This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. We thank the Dawn operations team for the development, cruise, orbital insertion and operations of the Dawn spacecraft at Ceres. M.A.H. was supported by National Science Foundation (NSF) grant DMS-1720349. US Government sponsorship is acknowledged. Author Contributions: C.A.R. led the preparation of the manuscript and the geophysical data analysis and interpretation with A.I.E. (MCMC modelling), J.C.C.-R. and M.A.H (thermal modelling), and S.M. and B.C.J. (scaled iSALE results). J.E.C.S. analysed dome morphology, D.L.B., H.G.S. and P.M.S. contributed to geomorphologic interpretation and J.T.K. illustrated the evolution scenario. A.N., R.S.P., T.H.P., L.C.Q., M.D.R. and C.T.R. contributed to the preparation of the manuscript. Data availability: The data that support the plots within this paper, and conclusions of this study are available from the PDS Small Bodies Node website (https://sbn.psi.edu/pds/resource/dawn) or from the corresponding author upon reasonable request. The authors declare no competing interests. Peer review information: Nature Astronomy thanks Douglas Hemingway and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
NSFDMS-1720349
Issue or Number:8
Record Number:CaltechAUTHORS:20200811-114716572
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200811-114716572
Official Citation:Raymond, C.A., Ermakov, A.I., Castillo-Rogez, J.C. et al. Impact-driven mobilization of deep crustal brines on dwarf planet Ceres. Nat Astron 4, 741–747 (2020). https://doi.org/10.1038/s41550-020-1168-2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104909
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:11 Aug 2020 19:11
Last Modified:11 Aug 2020 19:16

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