Solar Wind Neon from Genesis: Implications for the Lunar Noble Gas Record

Grimberg, A.; Baur, H.; Bochsler, P.; Bühler, F.; Burnett, D. S.; Hays, C. C.; Heber, V. S.; Jurewicz, A. J. G.; Wieler, R.

doi:10.1126/science.1133568

Cited by 136 publications

(127 citation statements)

References 20 publications

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“…1). Preliminary results from the Genesis mission (see Grimberg et al 2007) largely confirm the Apollo results. From the isotopic abundance measurements one derives an elemental ratio He/Ne = 530 ± 65.…”

Section: Introductionsupporting

confidence: 74%

Solar abundances of oxygen and neon derived from solar wind observations

Bochsler¹

2007

A&A

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Context. Recently, a revision of the solar abundances of C, N, and O to substantially lower values has led to a controversy on solar opacities in the solar standard model and to the suggestion to revise the solar abundance of neon upward by as much as a factor of 1.6 leading to enhanced solar neon/oxygen abundance ratios by a factor of 3. Neon and oxygen are neighboring elements with easily defined charged states in the solar wind, and they have been well identified and measured for over two decades in the solar wind under many circumstances and with several instruments. The solar wind Ne/O ratio is 0.14 with a conservative error estimate of ±0.03, consistent with the coronal value derived from solar energetic particle measurements. Aims. We investigate, whether solar wind observations are consistent with the newly proposed elemental solar abundances of neon and oxygen. Methods. The solar helium abundance has been derived from helioseismological observations. Helium and neon abundances in the solar wind have been well determined with the Apollo Foil experiments and, more recently, confirmed with the Genesis sample return mission. With these observations and the neon/oxygen solar wind abundance ratio determined by in-situ mass-spectrometry and using a simple theoretical model of Coulomb-drag fractionation for the solar wind, we estimate solar abundances for neon and oxygen. Results. From the variability of the helium/oxygen and the helium/neon ratio in the solar wind and from theoretical considerations, we conclude that the helium/neon ratio in the outer solar convective zone is 900 ± 110. Our best estimates of the solar neon and oxygen abundances in logarithmic dex-units are [Ne] = 7.96 ± 0.13, and [O] = 8.87 ± 0.11. Conclusions. Our solar neon/oxygen abundance ratio is consistent with the ratio derived from EUV-spectra from SOHO/CDS. However, our absolute abundance for oxygen is only marginally compatible with the newly derived value for oxygen, and our neon value is clearly incompatible with the recently proposed enhancement of the solar neon abundance.

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Section: Introductionsupporting

confidence: 74%

Solar abundances of oxygen and neon derived from solar wind observations

Bochsler¹

2007

A&A

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“…Solar wind ions are bound to the solar magnetic field and, thus, all ions are implanted with equal velocity so that all SW noble gases ( Figure 5) (Grimberg et al, 2006). Analogous isotopic effect has been observed in SW He, Ne and Ar in the lunar regolith samples (e.g.…”

Section: Depth Profiles Of Light Noble Gasesmentioning

confidence: 73%

Measuring the Isotopic Composition of Solar Wind Noble Gases

Meshik¹,

Hohenberg²,

Pravdivtseva³

et al. 2012

Exploring the Solar Wind

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“…One-sigma error envelopes of 38 Ar/ 36 Ar ratios in all the samples are within error of air (figure 3; table 1), even in well-gas samples containing as much as 50 per cent mantle argon (Holland & Ballentine 2006 Benkert et al 1993) due to implantation fractionation analogous to that observed in Ne isotopes (Grimberg et al 2006).…”

Section: Non-radiogenic Argon: No Evidence Of a Solar Componentmentioning

confidence: 90%

“…Solar Ne has a 20 Ne/ 22 NeZ13.8 (Benkert et al 1993;Grimberg et al 2006), while the maximum observed trapped in meteorites is 20 Ne/ 22 NeZ12.5 (Black 1972;Wieler 2002;Trieloff et al 2000Trieloff et al , 2002. Models of terrestrial volatile acquisition invoking a major role for solar nebula gases are predicted to produce a mantle 20 Ne/ 22 New13.8.…”

Section: Neon: a Trapped Meteorite Origin For Terrestrial Mantle Volamentioning

confidence: 99%

What CO ₂ well gases tell us about the origin of noble gases in the mantle and their relationship to the atmosphere

Ballentine

Holland²

2008

Phil. Trans. R. Soc. A.

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Study of commercially produced volcanic CO 2 gas associated with the Colorado Plateau, USA, has revealed substantial new information about the noble gas isotopic composition and elemental abundance pattern of the mantle. Combined with published data from midocean ridge basalts, it is now clear that the convecting mantle has a maximum 20 Ne/ 22 Ne isotopic composition, indistinguishable from that attributed to solar wind-implanted (SWI) neon in meteorites. This is distinct from the higher 20 Ne/ 22 Ne isotopic value expected for solar nebula gases. The non-radiogenic xenon isotopic composition of the well gases shows that 20 per cent of the mantle Xe is 'solar-like' in origin, but cannot resolve the small isotopic difference between the trapped meteorite 'Q'-component and solar Xe. The mantle primordial 20 Ne/ 132 Xe is approximately 1400 and is comparable with the upper end of that observed in meteorites. Previous work using the terrestrial 129 I-129 Xe mass balance demands that almost 99 per cent of the Xe (and therefore other noble gases) has been lost from the accreting solids and that Pu-I closure age models have shown this to have occurred in the first ca 100 Ma of the Earth's history. The highest concentrations of Q-Xe and solar wind-implanted (SWI)-Ne measured in meteorites allow for this loss and these high-abundance samples have a Ne/Xe ratio range compatible with the 'recycled-aircorrected' terrestrial mantle. These observations do not support models in which the terrestrial mantle acquired its volatiles from the primary capture of solar nebula gases and, in turn, strongly suggest that the primary terrestrial atmosphere, before isotopic fractionation, is most probably derived from degassed trapped volatiles in accreting material.By contrast, the non-radiogenic argon, krypton and 80 per cent of the xenon in the convecting mantle have the same isotopic composition and elemental abundance pattern as that found in seawater with a small sedimentary Kr and Xe admix. These mantle heavy noble gases are dominated by recycling of air dissolved in seawater back into the mantle. Numerical simulations suggest that plumes sampling the core-mantle boundary would be enriched in seawater-derived noble gases compared with the convecting mantle, and therefore have substantially lower 40 Ar/ 36 Ar. This is compatible with observation. The subduction process is not a complete barrier to volatile return to the mantle.

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Solar Wind Neon from Genesis: Implications for the Lunar Noble Gas Record

Cited by 136 publications

References 20 publications

Solar abundances of oxygen and neon derived from solar wind observations

Solar abundances of oxygen and neon derived from solar wind observations

Measuring the Isotopic Composition of Solar Wind Noble Gases

What CO ₂ well gases tell us about the origin of noble gases in the mantle and their relationship to the atmosphere

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Solar Wind Neon from Genesis: Implications for the Lunar Noble Gas Record

Cited by 136 publications

References 20 publications

Solar abundances of oxygen and neon derived from solar wind observations

Solar abundances of oxygen and neon derived from solar wind observations

Measuring the Isotopic Composition of Solar Wind Noble Gases

What CO 2 well gases tell us about the origin of noble gases in the mantle and their relationship to the atmosphere

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Product

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What CO ₂ well gases tell us about the origin of noble gases in the mantle and their relationship to the atmosphere