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• W2549206670 endingPage "150" @default.
• W2549206670 startingPage "137" @default.
• W2549206670 abstract "Abstract The source of volatiles is critical for understanding Terrestrial planet formation and the conditions that lead to habitable planets. The Earth lies inside the so-called ‘snow line’, outside of which H 2 O condenses to ice and can be incorporated into growing planetary bodies. Inside the snow line, incorporation of volatile elements is more problematic. A number of ideas have been proposed to explain sourcing of volatiles. One of the most common models involves late addition of volatile-rich chondritic material to the Terrestrial planets. This idea satisfies many of the geochemical constraints of the inner planets, but chondrites generally have D/H ratios that are considerably higher than the bulk Earth value. Here it is proposed that ingassing of a nebular atmosphere was an important source of hydrogen and other volatiles to Earth. If the proto-solar nebula was still present by the time the Earth approached its present size, then a dense atmosphere would necessarily develop and ingassing would be inevitable. The low D/H ratio of this component would offset the heavier chondritic and cometary sources and adequately explain the present-day volatile composition of the Earth. Hydrogen ingassing is a two-step process. The first stage involves the formation of a dense nebular atmosphere in the first ~ 10 My after the collapse of the proto-solar nebula. The atmosphere would cause heating of the planetary core to sufficient temperatures so as to cause complete melting. Massive ingassing of H 2 , H 2 O and other volatiles would occur. The oxygen fugacity ( f (O 2 )) of the mantle would be lowered and Fe 2 + would be reduced to Fe o and FeH x and then sequestered into the core. The second stage occurs after the nebula dissipates. Now H 2 would degas into the thin atmosphere and be lost to space by hydrodynamic escape. The degassing of H 2 would raise the f (O 2 ) of Earth to its present oxidized state and increase the D/H ratio of the remaining hydrogen to a value of ~− 300‰ (vs VSMOW). Evidence for this primitive component is found on samples from Earth, Moon and 4 Vesta. Later addition of chondritic and cometary material brought the D/H and 15 N/ 14 N ratios up to their present value. The scenario outlined here eliminates many of the problems inherent in previous models for volatile delivery to Earth." @default.
• W2549206670 created "2016-11-30" @default.
• W2549206670 creator A5036070265 @default.
• W2549206670 date "2017-01-01" @default.
• W2549206670 modified "2023-10-12" @default.
• W2549206670 title "Nebular ingassing as a source of volatiles to the Terrestrial planets" @default.
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