Crustal neon: a striking uniformity

Kennedy, B. M.; Hiyagon, H.; Reynolds, J. H.

doi:10.1016/0012-821x(90)90030-2

Cited by 169 publications

(75 citation statements)

References 16 publications

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“…Kennedy et al (1990) noticed a very uniform radiogenic 21Ne/4He ratio of about 5x10-8 in crustal fluids. Bottomley et al (1984) were able to detect radiogenic 21Ne in granitic rocks, whereas Weise et al (1992b) for the first time reported a liNe excess in a sedimentary aquifer.…”

Section: Dating Of Old Ground Watersmentioning

confidence: 95%

Noble Gases in Lakes and Ground Waters

Kipfer

Aeschbach–Hertig

Peeters

et al. 2002

Reviews in Mineralogy and Geochemistry

319

352

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Section: Dating Of Old Ground Watersmentioning

confidence: 95%

Noble Gases in Lakes and Ground Waters

Kipfer

Aeschbach–Hertig

Peeters

et al. 2002

Reviews in Mineralogy and Geochemistry

319

352

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“…Figure 2 plots the R/RA ratios versus (4He/ 20Ne)/(4He/2ONe)A ratios , where 3He/4He and 4He/ 20Ne ratios of mantle (M) , air (A) and crustal ra diogenic helium (C) are taken to be 11.2 x 10-6 (Sano and Wakita, 1985) and 6818, 1.4 x 10-6 and 0.318, 1.5 x 10-8 (Sano and Wakita, 1985) and 2.53 x 107, respectively. The mantle 4He/20Ne ra tio (M) was obtained from 4He/22Ne = 9 x 104 of Lollar et al (1994) ( Kennedy et al, 1990). The 4He/20Ne radiogenic ratio was obtained from the following ratios: 4He/ 21Ne = 1 .62 ± 0.03 x 107 (Kennedy et al, 1990), 20Ne/22Ne = 0 .3 (Bottomley et al, 1984) and 21Ne/ 22Ne = 0 .47 (Kennedy et al, 1990).…”

Section: Resultsmentioning

confidence: 99%

“…The mantle 4He/20Ne ra tio (M) was obtained from 4He/22Ne = 9 x 104 of Lollar et al (1994) ( Kennedy et al, 1990). The 4He/20Ne radiogenic ratio was obtained from the following ratios: 4He/ 21Ne = 1 .62 ± 0.03 x 107 (Kennedy et al, 1990), 20Ne/22Ne = 0 .3 (Bottomley et al, 1984) and 21Ne/ 22Ne = 0 .47 (Kennedy et al, 1990). Mixing curves of pure components; mantle (M), crust (C) and air (A) designate a confined field of helium and neon composition of the Earth (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The lowest R/RA ratio in the Carpathian carbonated waters is 0.25, but the 3He/20Ne ratios in all the samples (except sample 1) are higher than in air (4.5 x 10-7). The mantle 3He/20Ne ra tio was estimated to be 7.6 x 10-2 by adopting 3He/ 4He = 11 .2 x 10-6, 4He/20Ne = 9 x 104 (Lollar et al, 1994) and 20Ne/22Ne = 13.2 (Kennedy et al, 1990). Finally, the radiogenic 3He/20Ne ratio was found to be 0.38 by using 3He/4He = 1.5 x 10-8 (Sano and Wakita, 1985), 4He/2i Ne = 1.62 ± 0.03 x 107 (Kennedy et al, 1990), 20Ne/22Ne = 0.3 (Bottomley et al, 1984) and 2iNe/22Ne = 0.47 (Kennedy et al, 1990).…”

Section: Resultsmentioning

confidence: 99%

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Mantle helium signal in the West Carpathians, Poland.

et al. 1997

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Mantle derived helium with R/RA ratios up to 1, which accompanies CO2 exhalations and cold C02-rich carbonated waters, has been found to escape through the 40 km thick continental lithosphere in the Outer Carpathians. Revised 4He/20Ne ratios of mantle and crust (6818 and 2.53 x 107, respectively) allow the estimation of the respective contribution of mantle, crust and air-derived helium to the bulk helium. Although isotopic ratios of noble gases attest to a mixing process which takes place between crust and mantle gases, carbon isotope ratios of the CO2 (813C of -8.9 to -1.8 per mil) do not correlate with helium isotope ratios (R/RA), indicating complex processes of CO2 derivation. The R/RA ratios in methane-dominated gases are similar to those in C02-rich gases, designating similar mode of helium supply. The C02/311e ratios are up to 2 orders of magnitude higher than the secular C02/3He ratio of mantle gas emanations at ocean ridges. It suggests that the recycled crustal carbon rather than mantle carbon is the principal source of C02. The fluids of interest with their noble gases and other isotopic signatures and high concentrations of dissolved carbonates are similar to hydrothermal solutions observed in active marginal basins.

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“…Genesis identification of carbon isotopes of methane and ethane for Dabei gas field. 22 Ne than these of in air (Ballentine and O'Nions, 1992;Hiyagon et al, 1992;Honda et al, 1991;Kennedy et al, 1990;Sarda et al, 1988;Xu et al, 1996). Ne in Changshen and Xusheng gas fields reflects the mixing of solar wind type neon and mantle source contribution (Figure 7).…”

Section: Total Component Content Distribution Characteristics Of Rarementioning

confidence: 94%

Rare gases geochemical characteristics and gas source correlation for Dabei gas field in Kuche depression, Tarim Basin

Wang

Chen

et al. 2016

Energy Exploration & Exploitation

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The total components and isotopes of rare gases as well as hydrocarbon gases for Dabei gas field are analyzed firstly, then their geochemical characteristics and genesis are discussed respectively, finally gas source correlation and their contributions are evaluated. The research results show that: (1) In Dabei gas field, methane is the main component, accompanying with a few N 2 and CO 2 , as well as extremely low rare gases. In total component contents of rare gases, the He content is from 56.0 to 60.4 ppm with an average of 57.8 ppm and generally 1 order of magnitude higher than the air content value, while the Ne, Ar, Kr, and Xe contents are generally 1-3 orders of magnitude lower than the corresponding air content values. (2) The d 13 C 1 value in Dabei gas field usually ranges from À31.9% to À29.4%. The d 13 C 2 value generally ranges from À24.2% to À19.4%, which is obviously heavier than À28.5%, The natural gases in Dabei gas field can be identified as typical coal-formed gas. (3) Triassic-Jurassic, mainly contributed by Jurassic in vertical strata and coal rocks in type, coal rocks accounting for 63% and mudstones accounting for 37%.

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Crustal neon: a striking uniformity

Cited by 169 publications

References 16 publications

Noble Gases in Lakes and Ground Waters

Noble Gases in Lakes and Ground Waters

Mantle helium signal in the West Carpathians, Poland.

Rare gases geochemical characteristics and gas source correlation for Dabei gas field in Kuche depression, Tarim Basin

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