Formation of brucite and cronstedtite-bearing mineral assemblages on Ceres

Zolotov, M. Yu.

doi:10.1016/j.icarus.2013.09.020

Cited by 48 publications

(60 citation statements)

References 92 publications

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“…The spectra have been scaled so that the depths of the 3.06 lm band are equivalent. While Ceres is ''spectrally'' rich in the 3-lm region, the VNIR observations of Ceres and especially the 2-3 lm region are devoid of any absorption features, as pointed out by Zolotov (2014). In particular, the 2.47 lm band of brucite is absent (the summation band corresponding to the same lattice mode the 3.06 difference band).…”

Section: Brucite On Ceres?mentioning

confidence: 92%

“…c o m / l o c a t e / i c a r u s has been interpreted in a variety of ways, and the most recent suggestion, which generates an excellent fit from 2.80 to 4.00 lm, is a mixture of carbonates and brucite (Milliken and Rivkin, 2009). Such a mineral assemblage has not been observed in carbonaceous chondrites and requires very specific environmental conditions including a high water-rock ratio (Zolotov, 2014). In this paper, in order to gain insight into the possibility that brucite occurs at the surface of Ceres, which has strong implications for Ceres external cycles, we measured the reflectance spectra of brucite under temperature relevant for Ceres surface, i.e.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

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Low-temperature reflectance spectra of brucite and the primitive surface of 1-Ceres?

Beck

Schmitt

Cloutis

et al. 2015

Icarus

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Section: Brucite On Ceres?mentioning

confidence: 92%

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Low-temperature reflectance spectra of brucite and the primitive surface of 1-Ceres?

Beck

Schmitt

Cloutis

et al. 2015

Icarus

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“…Ceres will likely be contaminated by impactors in either the ice-rich [e.g., Castillo-Rogez and McCord, 2010] or porous silicate [e.g., Zolotov, 2009] models for Ceres' composition, as well as for cases that fall between these extremes. However, the efficiency of projectile retention and the physical state of the delivered projectile fraction may be different in the porous silicate and ice-rich cases.…”

Section: Role Of the Composition Of Ceresmentioning

confidence: 99%

“…These combined data sets reveal the implications of two end-member models ("ice-rich" [Castillo-Rogez and McCord, 2010] and "porous silicate" [Zolotov, 2009]) for the meteoritic contamination of Ceres. These combined data sets reveal the implications of two end-member models ("ice-rich" [Castillo-Rogez and McCord, 2010] and "porous silicate" [Zolotov, 2009]) for the meteoritic contamination of Ceres.…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, experimental estimates of projectile retention provide useful constraints. However, the relatively low mean density of Ceres (~2.1 g cm À3 ) [Thomas et al, 2005] raises the possibility that Ceres may host significant ice [Castillo-Rogez and McCord, 2010;Castillo-Rogez, 2011] or be composed of highly porous silicates [Zolotov, 2009]. However, the relatively low mean density of Ceres (~2.1 g cm À3 ) [Thomas et al, 2005] raises the possibility that Ceres may host significant ice [Castillo-Rogez and McCord, 2010;Castillo-Rogez, 2011] or be composed of highly porous silicates [Zolotov, 2009].…”

Section: Introductionmentioning

confidence: 99%

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Predictions for impactor contamination on Ceres based on hypervelocity impact experiments

Daly

Schultz

2015

Geophysical Research Letters

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New experiments predict that Ceres should be extensively contaminated with meteoritic debris derived from the asteroid belt. All types of impactors likely contribute to the contamination. Ceres may accrete debris more efficiently if it is ice‐rich because of enhanced projectile survival and retention in porous ice targets. Experiments indicate that if a silicate regolith lag protects subsurface ice, then some of the projectile should be injected into the regolith during high‐angle impacts, thereby hiding part of the projectile component from view. If impacts excavate ice, sublimation will gradually concentrate projectile relics into a surficial lag. In contrast, if the near‐surface lacks ice, then accreted meteoritic debris should be distributed throughout a vertically mixed regolith. High‐resolution images may reveal pristine projectile relics lining some crater floors. Moreover, we predict that the surface of Ceres is not exclusively endogenic and may be dominated by delivered exogenic debris.

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Core cracking and hydrothermal circulation can profoundly affect Ceres' geophysical evolution

2015

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Observations and models of Ceres suggest that its evolution was shaped by interactions between liquid water and silicate rock. Hydrothermal processes in a heated core require both fractured rock and liquid. Using a new core cracking model coupled to a thermal evolution code, we find volumes of fractured rock always large enough for significant interaction to occur. Therefore, liquid persistence is key. It is favored by antifreezes such as ammonia, by silicate dehydration which releases liquid, and by hydrothermal circulation itself, which enhances heat transport into the hydrosphere. The effect of heating from silicate hydration seems minor. Hydrothermal circulation can profoundly affect Ceres' evolution: it prevents core dehydration via "temperature resets, " core cooling events lasting ∼50 Myr during which Ceres' interior temperature profile becomes very shallow and its hydrosphere is largely liquid. Whether Ceres has experienced such extensive hydrothermalism may be determined through examination of its present-day structure. A large, fully hydrated core (radius 420 km) would suggest that extensive hydrothermal circulation prevented core dehydration. A small, dry core (radius 350 km) suggests early dehydration from short-lived radionuclides, with shallow hydrothermalism at best. Intermediate structures with a partially dehydrated core seem ambiguous, compatible both with late partial dehydration without hydrothermal circulation, and with early dehydration with extensive hydrothermal circulation. Thus, gravity measurements by the Dawn orbiter, whose arrival at Ceres is imminent, could help discriminate between scenarios for Ceres' evolution.

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Formation of brucite and cronstedtite-bearing mineral assemblages on Ceres

Cited by 48 publications

References 92 publications

Low-temperature reflectance spectra of brucite and the primitive surface of 1-Ceres?

Low-temperature reflectance spectra of brucite and the primitive surface of 1-Ceres?

Predictions for impactor contamination on Ceres based on hypervelocity impact experiments

Core cracking and hydrothermal circulation can profoundly affect Ceres' geophysical evolution

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