Terrestrial helium degassing fluxes and the atmospheric helium budget: Implications with respect to the degassing processes of continental crust

Torgersen, T.

doi:10.1016/0168-9622(89)90002-x

Cited by 103 publications

(111 citation statements)

References 59 publications

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“…If this is the case, then the calculated 4Hecrust (section 2, equation (4)) represents a lower limit to the proper value (RMoR has to be replaced in (4) by a somewhat larger number). Still, the effect would be small since the average 4He flux from hot spot sources is estimated to be more than 2 orders of magnitude lower than the flux of 4Hecrust [Torgersen, 1989] A step beyond the present study will become possible once the entire WOCE helium isotope data set will be at hand in a thoroughly intercalibrated form. The data set will also include neon data, so that the full benefit of the procedure devised here will be obtained.…”

Section: Isotope Ratio Of T Errigenic Heliummentioning

confidence: 99%

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Crustal helium in deep Pacific waters

Well¹,

Lupton²,

Roether³

2001

J. Geophys. Res.

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Section: Isotope Ratio Of T Errigenic Heliummentioning

confidence: 99%

“…Although the abundance of U and Th in oceanic crust is relatively low (compared to continental crust), this flux amounts to approximately 10% of the total terrestrial 4He degassing flux [Torgersen, 1989]. In contrast to ocean turnover times.…”

Section: Introductionmentioning

confidence: 99%

Crustal helium in deep Pacific waters

Well¹,

Lupton²,

Roether³

2001

J. Geophys. Res.

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“…Unlike any other element except hydrogen, helium has a residence time in the atmosphere of approximately 10 6 years (Torgersen 1989) before being lost to space. This results in the atmosphere having a very low He concentration and enables helium enriched in 3 He relative to 4 He degassing from mid-ocean ridges to be readily identified.…”

Section: Helium: the Case For An Accretionary Volatile Reservoir In Tmentioning

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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“…Consequently, the main contribution to a scale offset of nonatmospheric 3He using (4) is expected to arise l¾om the term the. For this reason we tentatively use aHe -a3H e + d3He/He = 0. ridges and similar sources) Rmantle 8 R a or more [Torgersen, 1989] Apparent terrigenic 3He is the quantit)., that may interl•re with tritiugenic 3He t?om the nuclear (or bomb) period (rbomb). One theretbre has /'bolnb = F-rnat = t3H e + r-t3H e-…”

Section: Component Separation Proceduresmentioning

confidence: 99%

“…Subsequent work showed that terrigenic He ranges between about 1 order of magnitude higher in 3He than atmospheric He if the source is the earth mantle (releases mostly at mid-ocean ridges), and by a similar factor lower for a crustal origin (from sediments) [Craig and Lupton, 1981 ' Torgersen, 1989]. …”

mentioning

confidence: 99%

Component separation of oceanic helium

Roether¹,

Well²,

Putzka³

et al. 1998

J. Geophys. Res.

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Abstract. A new procedure to quantify, the components of oceanic helium ("terrigenic" 3He and 4He released from the ocean floor and "tritiugenic" 3He from tritium decay) is described. Terrigenic He and nonatmospheric 3He (i.e., terrigenic and tritiugenic combined) are obtained in terms of measured concentrations of the He isotopes and also of neon (Ne) (which improves the separation considerably), asstuning terrigenic He to vanish in the mixed layer. For the subsequent separation of terrigenic and tritiugemc 3He, additional information is required and 3He due to natural tritium represents a complication. The procedure is applied to data from a

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Terrestrial helium degassing fluxes and the atmospheric helium budget: Implications with respect to the degassing processes of continental crust

Cited by 103 publications

References 59 publications

Crustal helium in deep Pacific waters

Crustal helium in deep Pacific waters

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

Component separation of oceanic helium

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Terrestrial helium degassing fluxes and the atmospheric helium budget: Implications with respect to the degassing processes of continental crust

Cited by 103 publications

References 59 publications

Crustal helium in deep Pacific waters

Crustal helium in deep Pacific waters

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

Component separation of oceanic helium

Contact Info

Product

Resources

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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