气候变化领域集成服务门户(CCPortal): A carbonaceous chondrite and cometary origin for icy moons of Jupiter and Saturn

CCPortal

DOI	10.1016/j.epsl.2019.115920
	A carbonaceous chondrite and cometary origin for icy moons of Jupiter and Saturn
	Néri A.; Guyot F.; Reynard B.; Sotin C.
发表日期	2020
ISSN	0012821X
卷号	530
英文摘要	The inner structure of icy moons comprises ices, liquid water, a silicate rocky core and sometimes an inner metallic core depending on thermal evolution and differentiation. Mineralogy and density models for the silicate part of the icy satellites cores were assessed assuming a carbonaceous chondritic (CI) bulk composition and using a free-energy minimization code and experiments. Densities of other components, solid and liquid sulfides, carbonaceous matter, were evaluated from available equations of state. Model densities for silicates are larger than assessed from magnesian terrestrial minerals, by 200 to 600 kg.m−3 for the hydrated silicates, and 300 to 500 kg.m−3 for the dry silicates, due to the high iron bulk concentration in CI. The stability of Na-phlogopite in the silicate fraction up to 1300 K favors the trapping of most 40K in the rocky/carbonaceous cores with important consequences for modeling of the thermal evolution of icy satellites. We find that CI density models of icy satellite cores taking into account only the silicate and metal/sulfide fraction cannot account for the observed densities and reduced moment of inertia of Titan and Ganymede without adding a lower density component. We propose that this low-density component is carbonaceous matter derived from insoluble organic matter, in proportion of ∼30-40% in volume and 15-20% in mass. This proportion is compatible with contributions from CI and comets, making these primitive bodies including their carbonaceous matter component likely precursors of icy moons, and potentially of most of the objects formed behind the snow line of the solar system. © 2019 Elsevier B.V.
关键词	carbonaceous chondrites comet core composition Ganymede satellite Titan
英文关键词	Equations of state of liquids; Free energy; Interplanetary flight; Magnesia; Meteorites; Mica; Satellites; Silicates; Snow making; Sulfur compounds; Carbonaceous chondrites; comet; Core composition; Ganymede; Titan; Sodium compounds; carbonaceous chondrite; comet; density; Ganymede; Jupiter; mineralogy; Saturn; silicate; Titan
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202803
作者单位	University of Lyon, ENS de Lyon, CNRS, Lyon, France; Museum National d'Histoire Naturelle, Sorbonne Université, IMPMC, UMR CNRS 7590, IRD UMR206, Paris, France; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Néri A.,Guyot F.,Reynard B.,et al. A carbonaceous chondrite and cometary origin for icy moons of Jupiter and Saturn[J],2020,530.
APA	Néri A.,Guyot F.,Reynard B.,&Sotin C..(2020).A carbonaceous chondrite and cometary origin for icy moons of Jupiter and Saturn.Earth and Planetary Science Letters,530.
MLA	Néri A.,et al."A carbonaceous chondrite and cometary origin for icy moons of Jupiter and Saturn".Earth and Planetary Science Letters 530(2020).