Carbon and hydrogen isotopic compositions of New Zealand geothermal gases

Lyon, G. L.; Hulston, J.R.

doi:10.1016/0016-7037(84)90052-8

Cited by 130 publications

(52 citation statements)

References 35 publications

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“…In New Zealand, isotopic temperatures at wells are lower than those estimated for hot springs, but are generally consistent with temperatures actually measured in thermal fluid reservoir (Lyon and Hulston, 1984 where X indicates the mole fraction of gas species; t represents temperature (°C). This suggests that these gas contents have been controlled by chemical reactions.…”

Section: Isotopic Composition Of Hydrogensupporting

confidence: 76%

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D/H ratio of hydrogen and gas chemistry in three active geothermal systems, Northeast Japan.

Kiyosu

1987

Geochem. J.

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Section: Isotopic Composition Of Hydrogensupporting

confidence: 76%

“…The 6D values of H2 from Northeast Japan are similar to those from Iceland ( 359 632 %o according to Arnason, 1977) and New Zealand (-310 -600%o according to Lyon and Hulston , 1984). The Matsukawa hydrogen shows more variable and higher deuterium content than do those from the other two areas.…”

Section: Isotopic Composition Of Hydrogensupporting

confidence: 54%

D/H ratio of hydrogen and gas chemistry in three active geothermal systems, Northeast Japan.

Kiyosu

1987

Geochem. J.

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“…Volcanic and geothermal methanes (Gunter and Musgrave, 1971;Panichi et al, 1979;Lyon and Hulston, 1984) are also similar in PC value to kerogens, but more negative in 6D value than those, as shown in Fig. 3.…”

Section: Resultsmentioning

confidence: 58%

“…In the early stage of carbon isotopic studies on geothermal gases, carbon-13 fractionation between coexisting methane and carbon dioxide were used as the basis of isotopic geothermometer. Discrepancies between isotopic and measured or Si02(or Na K-Ca) temperatures were interpreted as a result of the freezing-in of higher temperature equilibrium composition, generally 100-200'C higher than measured temperatures, or partial re-equilibration in the way to the surface (Lyon and Hulston, 1984). Similar discrepancies are found between the a13C(CH4-CO2) and Na-K Ca(or Na/Li) temperatures estimated for the springs and wells studied (Table 4).…”

Section: Resultsmentioning

confidence: 98%

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Hydrogen and carbon isotopic compositions of methane in N2- and CO2-rich gases from Central Japan.

Mizutani¹,

Tokiwa²,

Satake³

1989

Geochem. J.

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N2 and C02-rich bubble gases collected from five springs and four wells in Paleozoic metamorphic rock and Cretaceous granite areas of Central Japan contain up to 22.9% methane. 6D and 613C values are between 100 and -180%o, and between -24 and -51 %o, respectively, for the methane. A linear correlation between 6D and 813C values observed is almost identical with that for the TT(m) type ther mogenic methane. The methane in the bubble gases is likely to be originated by thermal decomposition of organic matter in deep-seated metasedimentary rocks. The contribution of volcanic, magmatic and mantle-derived methanes to the bubble gases is probably insignificant, whereas 3He/4He values given by previous works indicate the presence of gas components derived from deep-seated sources, such as the magma, lower crust and mantle, in the gases.

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Soil CO₂ emissions as a proxy for heat and mass flow assessment, Taupō Volcanic Zone, New Zealand

Bloomberg

Werner

Rissmann³

et al. 2014

Geochem Geophys Geosyst

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The quantification of heat and mass flow between deep reservoirs and the surface is important for understanding magmatic and hydrothermal systems. Here, we use high-resolution measurement of carbon dioxide flux (uCO 2 ) and heat flow at the surface to characterize the mass (CO 2 and steam) and heat released to the atmosphere from two magma-hydrothermal systems. Our soil gas and heat flow surveys at Rotokawa and White Island in the Taup o Volcanic Zone, New Zealand, include over 3000 direct measurements of uCO 2 and soil temperature and 60 carbon isotopic values on soil gases. Carbon dioxide flux was separated into background and magmatic/hydrothermal populations based on the measured values and isotopic characterization. Total CO 2 emission rates (RCO 2 ) of 441 6 84 Island, demonstrating that earlier research underestimated emissions by 700% (Rotokawa) and 25% (White Island). These differences suggest that soil CO 2 emissions facilitate more robust estimates of the thermal energy and mass flux in geothermal systems than traditional approaches. Combining the magmatic/hydrothermal-sourced CO 2 emission (constrained using stable isotopes) with reservoir H 2 O:CO 2 mass ratios and the enthalpy of evaporation, the surface expression of thermal energy release for the Rotokawa hydrothermal system (226 MW t ) is 10 times greater than the White Island crater floor (22.5 MW t ).

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Carbon and hydrogen isotopic compositions of New Zealand geothermal gases

Cited by 130 publications

References 35 publications

D/H ratio of hydrogen and gas chemistry in three active geothermal systems, Northeast Japan.

D/H ratio of hydrogen and gas chemistry in three active geothermal systems, Northeast Japan.

Hydrogen and carbon isotopic compositions of methane in N2- and CO2-rich gases from Central Japan.

Soil CO₂ emissions as a proxy for heat and mass flow assessment, Taupō Volcanic Zone, New Zealand

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Carbon and hydrogen isotopic compositions of New Zealand geothermal gases

Cited by 130 publications

References 35 publications

D/H ratio of hydrogen and gas chemistry in three active geothermal systems, Northeast Japan.

D/H ratio of hydrogen and gas chemistry in three active geothermal systems, Northeast Japan.

Hydrogen and carbon isotopic compositions of methane in N2- and CO2-rich gases from Central Japan.

Soil CO2 emissions as a proxy for heat and mass flow assessment, Taupō Volcanic Zone, New Zealand

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Soil CO₂ emissions as a proxy for heat and mass flow assessment, Taupō Volcanic Zone, New Zealand