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Noble gases in the Earth's mantle

Farley, K. A. and Neroda­, E. (1998) Noble gases in the Earth's mantle. Annual Review of Earth and Planetary Sciences, 26 . pp. 189-218. ISSN 0084-6597. doi:10.1146/

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Noble gas isotopic ratios in mantle-derived samples require variability in the time-integrated ratio of volatile to lithophile elements in the Earth. Documentation of mantle ³He/⁴He variability is becoming increasingly complete, but for the heavier noble gases, the picture is still partly clouded by the effects of atmospheric contamination of mantle samples. Nevertheless, clear variations in mantle Ne, Ar, and Xe isotopic ratios exist, are apparently correlated with ³He/⁴He, and may be the product of varying degrees of mantle degassing. However, uncertainties in noble gas geochemical behavior and several conflicting observations leave open other possibilities. Recent Ne isotopic data are particularly important because they require that the atmosphere has not been closed to exchange with space. Derivation of much of the atmosphere from a source other than degassing of the mantle is a strong possibility that complicates efforts to model the geochemical evolution of the Earth.

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Farley, K. A.0000-0002-7846-7546
Additional Information:© 1998 by Annual Reviews. We thank D Graham, D Hilton, D Porcelli, and D Patterson for helpful comments.
Subject Keywords:mantle evolution; atmosphere formation; mantle geochemistry; planetary outgassing; radiogenic isotopes
Record Number:CaltechAUTHORS:FARareps98
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Official Citation:Noble gases in the Earth's mantle. K. A. Farley and and E. Neroda. Annual Review of Earth and Planetary Sciences 1998 26:1, 189-218; doi: 10.1146/
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2108
Deposited By: Tony Diaz
Deposited On:09 Mar 2006
Last Modified:08 Nov 2021 19:45

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