Mantle degassing and atmospheric evolution: Noble gas view.
نویسندگان
چکیده
منابع مشابه
Numerical models, geochemistry and the zero-paradox noble-gas mantle.
Numerical models of whole-mantle convection demonstrate that degassing of the mantle is an inefficient process, resulting in ca. 50% of the (40)Ar being degassed from the mantle system. In this sense the numerical simulations are consistent with the (40)Ar mass balance between the atmosphere and mantle reservoir. These models, however, are unable to preserve the large-scale heterogeneity predic...
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Trieloff et al. (1) provided neon isotope data to argue that mantle neon originates as a trapped component in meteorites rather than having a pristine solar composition. That finding, if true, has important consequences for understanding the mechanism of volatile input into the mantle, because it rules out models involving direct incorporation of solar gases. The main argument that Trieloff et ...
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There are two types of planetary noble gases. One containing isotopically " anomalous: argon ,krypton and xenon but isotopically " normal " helium and neon, was derived from outer stellar regions. The other, consisting almost entirely of isotopically " normal " argon, krypton and xenon with little or no helium or neon, was derived from inner stellar regions. Mixing of nucleosynthesis products f...
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As a result of an energetic accretion, the Earth is a volatile-poor and strongly differentiated planet. The volatile elements can be accounted for by a late veneer ( approximately 1% of total mass of the Earth). The incompatible elements are strongly concentrated into the exosphere (atmosphere, oceans, sediments, and crust) and upper mantle. Recent geochemical models invoke a large primordial u...
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As part of this special issue in honor of Gerardo Delgado Barrio, we have reviewed the interplay between experimental and theoretical work on halogen and interhalogen diatomic molecule bonded to one or more noble gas atoms and also ionic clusters consisting of noble gas atoms. Although the Madrid group has worked on many theoretical issues, they have made particularly important contributions to...
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ژورنال
عنوان ژورنال: GEOCHEMICAL JOURNAL
سال: 1993
ISSN: 0016-7002
DOI: 10.2343/geochemj.27.185