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Scully, J. E. C.; Schenk, P. M.; Castillo-Rogez, J. C.; Buczkowski, D. L.; Williams, D. A.; Pasckert, J. H.; Duarte, K. D.; Romero, V. N.; Quick, L. C.; Sori, M. M.; Landis, M. E.; Raymond, C. A.; Neesemann, Alicia; Schmidt, B. E.; Sizemore, H. G.; Russell, C. T.
Nature communications, 08/2020, Letnik: 11, Številka: 1Journal Article
Before acquiring highest-resolution data of Ceres, questions remained about the emplacement mechanism and source of Occator crater’s bright faculae. Here we report that brine effusion emplaced the faculae in a brine-limited, impact-induced hydrothermal system. Impact-derived fracturing enabled brines to reach the surface. The central faculae, Cerealia and Pasola Facula, postdate the central pit, and were primarily sourced from an impact-induced melt chamber, with some contribution from a deeper, pre-existing brine reservoir. Vinalia Faculae, in the crater floor, were sourced from the laterally extensive deep reservoir only. Vinalia Faculae are comparatively thinner and display greater ballistic emplacement than the central faculae because the deep reservoir brines took a longer path to the surface and contained more gas than the shallower impact-induced melt chamber brines. Impact-derived fractures providing conduits, and mixing of impact-induced melt with deeper endogenic brines, could also allow oceanic material to reach the surfaces of other large icy bodies.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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