A helium isotope profile of Lake Taupo, New Zealand

Torgersen, T.

doi:10.1080/00288306.1983.10422236

Cited by 3 publications

(2 citation statements)

References 12 publications

(10 reference statements)

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“…The primary flux data were compiled by Ballentine et al [2002] for groundwater basins and Kipfer et al [2002] for lakes from various sources as noted in the footnotes to Table 1. In addition to these quantifications, the method of Kipfer et al [2002] (utilizing a plot of excess 4 He versus 3 H‐ 3 He age of the water) was applied to Green Lake [ Torgersen et al , 1981], Teggau Lake [ Torgersen and Clarke , 1978], Lake 120 [ Campbell and Torgersen , 1980], and Lake Taupo [ Torgersen , 1983] and generally yielded defined fluxes. However, the data for Lakes Huron, Erie, and Ontario [ Torgersen et al , 1977] resulted in slopes that were not well defined and can be approximated by fluxes from <10 10 atoms 4 He m −2 s −1 to indistinguishable from zero.…”

Section: Results: Data Sources and Calculationsmentioning

confidence: 99%

“… a References are as follows: 1, O'Nions and Oxburgh [1988]; 2, Torgersen and Clarke [1985]; 3, Torgersen and Ivey [1985]; 4, Heaton [1984]; 5, Stute et al [1992]; 6, Martel et al [1989]; 7, Andrews et al [1985]; 8, Marty et al [1993]; 9, Pinti and Marty [1995]; 10, Pinti et al [1997]; 11, Castro et al [1998a, 1998b]; 12, S. Dewonck et al (as cited by Ballentine et al [2002]); 13, Torgersen et al [1981]; 14, Campbell and Torgersen [1980]; 15, Torgersen and Clarke [1978]; 16, Torgersen [1983]; 17, Torgersen et al [1977]; 18, Clarke et al [1977], Clarke et al [1983], and Top and Clarke [1981]; 19, Kipfer et al [2002]; 20, Castro et al [2000]; 21, Stute et al [1995]; 22, Well et al [2001] (in the work by Schlosser and Winckler [2002]); 23, Top and Clarke [1981]; 24, Torgersen [1989]; 25, this study. …”

Section: Introductionmentioning

confidence: 99%

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Continental degassing flux of ⁴He and its variability

Torgersen

2010

Geochem Geophys Geosyst

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[1] The existing measures of the 4 He flux from the Earth's continental solid surface have been evaluated collectively. The lognormal mean of continental crustal flux measurements (n = 33) globally covering many geological environments is 4.18 × 10 10 4 He atoms m −2 s −1 with an estimated one sigma variance of */45X based on an assumption of symmetric error bars (lognormal distribution provides a standard deviation with a multiplication or division factor (*/) by which the mean may statistically vary). The range of the continental 4 He degassing flux (95th percentile) increases with decreasing time scales (to */∼10 6 X at 0.5 year) and decreasing space scales (to */∼10 6 X at 1 km). The statistics can be interpreted as reflecting natural variability and suggest that the mechanisms transporting the crustal helium degassing flux contain a high degree of both spatial and temporal variability. This lognormal mean of the continental degassing flux of 4 He as well as the (n = 271) estimate of degassing from Precambrian Shield lakes are both approximately equivalent to the radiogenic production rate for 4 He in the whole crust. Large-scale vertical mass transport in continental crust is estimated as scaled values of the order 10 −5 cm 2 s −1 for helium (over 2 Gyr and 40 km vertically) versus 10 −2 cm 2 s −1 for heat. This rate of mass transport requires not only release of He from the solid phase via diffusion, fracturing, or comminution but also an enhanced rate of mass transport facilitated by some degree of fluid advection. This further implies a separation of heat and mass during transport which will significantly influence the interpretations of heat and 3 He/ 4 He relations.

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Section: Results: Data Sources and Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continental degassing flux of ⁴He and its variability

Torgersen

2010

Geochem Geophys Geosyst

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Isotopic composition of helium, and CO2 and CH4 contents in gases produced along the New Zealand part of a convergent plate boundary

Giggenbach

Sano

Wakita

1993

Geochimica et Cosmochimica Acta

257

154

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First Estimates of Hydrothermal Helium Fluxes in Continental Collision Settings: Insights From the Southeast Tibetan Plateau Margin

Zhang

Liu

Guan

et al. 2022

Geophysical Research Letters

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Continental regions are essential for the outgassing of deeply‐sourced helium in response to volcanic and tectonic processes. However, the helium fluxes remain largely unknown for continental collision settings such as the Tibetan Plateau. Here, we focus on hydrothermal helium degassing from the Simao block, Southeast Tibetan Plateau margin, and report flux estimates of (0.03 – 32) × 105 atoms m−2 s−1 for 3He and (3.2 – 32) × 1010 atoms m−2 s−1 for 4He, with mantle fractions of helium fluxes up to 2−3 orders of magnitude greater than those of stable continents. Geologically recent magma recharge beneath Quaternary volcanoes is proposed to account for the high mantle helium fluxes and 3He/4He up to 7.24 Ra. Active tectonics driven by the India‐Asia continental collision possibly maintained efficient release of crustal helium over geological timescales. These findings present the first flux estimates for hydrothermal helium degassing controlled by volcanic and tectonic processes in continental collision settings.

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A helium isotope profile of Lake Taupo, New Zealand

Cited by 3 publications

References 12 publications

Continental degassing flux of ⁴He and its variability

Continental degassing flux of ⁴He and its variability

Isotopic composition of helium, and CO2 and CH4 contents in gases produced along the New Zealand part of a convergent plate boundary

First Estimates of Hydrothermal Helium Fluxes in Continental Collision Settings: Insights From the Southeast Tibetan Plateau Margin

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A helium isotope profile of Lake Taupo, New Zealand

Cited by 3 publications

References 12 publications

Continental degassing flux of 4He and its variability

Continental degassing flux of 4He and its variability

Isotopic composition of helium, and CO2 and CH4 contents in gases produced along the New Zealand part of a convergent plate boundary

First Estimates of Hydrothermal Helium Fluxes in Continental Collision Settings: Insights From the Southeast Tibetan Plateau Margin

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Continental degassing flux of ⁴He and its variability

Continental degassing flux of ⁴He and its variability