Accurate Measurement of Atmospheric Helium Isotopes

Sano, Yuji; Tokutake, Taichi; Takahata, Naoto

doi:10.2116/analsci.24.521

Cited by 51 publications

(51 citation statements)

References 16 publications

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“…Hydrogen isotope ratio of H 2 was determined by continuous-flow isotope ratio mass spectrometry with analytical error of 5‰ (1σ) (Kawagucci et al, 2010b). Helium isotope ratio was measured with a conventional noble gas mass spectrometer (Sano et al, 2008). Hydrogen and oxygen isotope ratios of water (H 2 O) were determined by a wavelength-scanned cavity ring down spectroscopy analyzer (Liquid Water Isotope Analyzer, Los Gatos Research, Inc.) with analytical precision within 1.0‰ and 0.5‰ (1σ), respectively.…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Diversity of fluid geochemistry affected by processes during fluid upwelling in active hydrothermal fields in the Izena Hole, the middle Okinawa Trough back-arc basin

et al. 2014

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Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Diversity of fluid geochemistry affected by processes during fluid upwelling in active hydrothermal fields in the Izena Hole, the middle Okinawa Trough back-arc basin

et al. 2014

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“…The longterm reproducibility of HESJ, 0.03% (2r) is significantly smaller than the single measurements of A 1 and A 2 , 0.1-0.2% (2r). See Sano et al (2008) for further details.…”

Section: Experimental Methodsmentioning

confidence: 99%

Atmospheric helium isotope ratio: Possible temporal and spatial variations

Sano

Furukawa

Takahata

2010

Geochimica et Cosmochimica Acta

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“…Stable hydrogen and carbon isotope ratios are represented by the generally-used linear δ-notation in per-mil scales against the standards of VSMOW and PDB, respectively. The 3 He/ 4 He ratio was measured by a conventional noble gas mass spectrometer (Sano and Wakita, 1988;Sano et al, 2008 …”

Section: Analysesmentioning

confidence: 99%

Hydrothermal fluid geochemistry at the Iheya North field in the mid-Okinawa Trough: Implication for origin of methane in subseafloor fluid circulation systems

et al. 2011

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Geochemical characteristics of hydrothermal fluids in the Iheya North hydrothermal field, mid-Okinawa Trough, was investigated. Twelve-years observation reveals temporal variation of vent fluid chemistry potentially controlled by temporally varying pattern of the phase-separation and -segregation, while the constant Element/Cl ratios among the periods and chimneys indicate the stable chemical composition of the source hydrothermal fluid prior to undergoing phaseseparation. The high K contents in the estimated source fluid are typical in the arc-backarc hydrothermal systems due to the hydrothermal reaction with the K-enriched felsic rocks. The high I, B and NH 4 contents and alkalinity are derived from decomposition of the sedimentary organic matters.Compositional and isotopic properties of gas species, CH 4 , H 2 , CO 2 , and C 2 H 6 , strongly suggest a dominance of biogenic CH 4 associated with the sedimentary organic matter. Based on the carbon mass balance calculation and the multidisciplinary investigations of the Iheya North hydrothermal system since the discovery, we hypothesized that the microbial methanogenesis occurs not only within the Central Valley where hydrothermal vents exist, but also in the spatially abundant and widespread basin-filling sediments surrounding the Iheya North Knoll, and that the microbially produced CH 4 is recharged together with the source fluid into the deep hydrothermal reaction zone. This "Microbial Methanogenesis at Recharge area in hydrothermal circulation" (MMR) model would be an implication for the generation and incorporation of hydrothermal fluid CH 4 in the deep-sea hydrothermal systems but also for those of cold seep CH 4 and for the presently uncertain hydrothermal fluid paths in the subseafloor environments. In the near future, the IODP drilling will be conducted in the Iheya North hydrothermal system, and give an excellent opportunity to testify our MMR model.

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Accurate Measurement of Atmospheric Helium Isotopes

Cited by 51 publications

References 16 publications

Diversity of fluid geochemistry affected by processes during fluid upwelling in active hydrothermal fields in the Izena Hole, the middle Okinawa Trough back-arc basin

Diversity of fluid geochemistry affected by processes during fluid upwelling in active hydrothermal fields in the Izena Hole, the middle Okinawa Trough back-arc basin

Atmospheric helium isotope ratio: Possible temporal and spatial variations

Hydrothermal fluid geochemistry at the Iheya North field in the mid-Okinawa Trough: Implication for origin of methane in subseafloor fluid circulation systems

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