Differentiation time scales of small rocky bodies

Monnereau, M.; Guignard, Jérémy; Néri, Adrien; Toplis, Michael J.; Quitté, G.

doi:10.1016/j.icarus.2022.115294

Cited by 5 publications

(2 citation statements)

References 73 publications

(130 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The efficiency of the serpentinization process is very sensitive to the actual local temperature which itself strongly depends on the amount of heat-producing radiogenic nuclei ( 26 Al) in the early stages of the evolution. As it was shown by Monnereau et al (2023) for the inner solar system, if the accretion time is less than 1.5 Myr after the CAI formation then the whole body can be differentiated, but if the accretion is completed later, it can differentiate only partially or not at all. Almost all dwarf planets in the Kuiper Belt have at least one known satellite (Noll et al 2020;Holler et al 2021a).…”

Section: Introductionmentioning

confidence: 79%

The Impact of Serpentinization on the Initial Conditions of Satellite Forming Collisions of Large Kuiper Belt Objects

Farkas-Takács,

Kiss

2023

PASP

View full text Add to dashboard Cite

Kuiper Belt objects are thought to be formed at least a few million years after the formation of calcium–aluminum-rich inclusions (CAIs), at a time when the 26Al isotope—the major source of radiogenic heat in the early solar system—had significantly depleted. The internal structure of these objects is highly dependent on any additional source that can produce extra heat in addition to that produced by the remaining, long-lasting radioactive isotopes. In this paper, we explore how serpentinization, the hydration of silicate minerals, can contribute to the heat budget and to what extent it can modify the internal structure of large Kuiper Belt objects. We find that the extent of restructuring depends very strongly on the start time of the formation process, the size of the object, and the starting ice-to-rock ratio. Serpentinization is able to restructure most of the interior of all objects in the whole size range (400–1200 km) and ice-to-rock ratio range investigated if the process starts early, ∼3 Myr after CAI formation, potentially leading to a predominantly serpentine core much earlier than previously thought (≤5 Myr versus several tens of million years). While the ratio of serpentinized material gradually decreases with the increasing formation time, the increasing ice-to-rock ratio, and the increasing start time of planetesimal formation in the outer solar system, in the case of the largest objects a significant part of the interior will be serpentinized even if the formation starts relatively late, ∼5 Myr after CAI formation. Therefore it is feasible that the interior of planetesimals may have contained a significant amount of serpentine, and in some cases, it could have been a dominant constituent, at the time of satellite-forming impacts.

show abstract

Section: Introductionmentioning

confidence: 79%

The Impact of Serpentinization on the Initial Conditions of Satellite Forming Collisions of Large Kuiper Belt Objects

Farkas-Takács,

Kiss

2023

PASP

View full text Add to dashboard Cite

show abstract

“…However, the idea that melt migration was efficient enough to remove 26 Al, and thus dampen the melting, relied on overestimated percolation rates so that such a drainage cannot prevent the possible formation of global magma oceans. 81 There are even some more recent results of experiments in low-degree (<15%) partial melts rich in SiO 2 , Al 2 O 3 , and alkali elements that suggest the possibility of widespread high-viscosity silica-rich melts in small bodies of the early Solar System but that the evidence was erased by subsequent stages of melting, accretion, and differentiation. 82 “Primitive achondrites may record melt migration in rubble-pile bodies reaccreted from fragments of partially molten planetesimals.” 83 Thus, it is very likely that some asteroids were more chemically modified respect to others with chondrites generally less differentiated than achondrites.…”

Section: Igneous Processes In Asteroidsmentioning

confidence: 99%