Helium-3 Emission Related to Volcanic Activity

Sano, Yuji; Nakamura, Yuji; Wakita, Hiroshi; Urabe, Akiko; Tominaga, T.

doi:10.1126/science.224.4645.150

Cited by 99 publications

(42 citation statements)

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“…5), demonstrating that the lower 3 He/ 4 He ratio is due to the addition of extraneous radiogenic helium, presumably from the surrounding host rocks. Such a subsurface crustal contamination has been observed in many instances (see Gasparon et al, 1994 and references therein) and is also responsible for the decreasing trend in the ( 3 He/ 4 He) values of volcanic gases which is classically observed away from the main conduit of volcanic edifices (Sano et al, 1984. Fig.…”

Section: Discussionmentioning

confidence: 99%

Helium isotope systematics of volcanic gases and thermal waters of Guadeloupe Island, Lesser Antilles

Jean‐Baptiste

Allard

Fourré

et al. 2014

Journal of Volcanology and Geothermal Research

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The island of Guadeloupe is located in the middle of the 850 km long Lesser Antilles island arc. Present-day volcanic and geothermal activity is concentrated in two systems both located in the southwestern part of the island (Basse Terre): the La Soufrière volcanic complex and the Bouillante hydrothermal system, some 20 km to the northwest of the volcano. We report here the largest isotopic data set for helium isotopes in hydrothermal gases and waters from both systems, acquired between 1980 and 2012. 3 He/ 4 He ratios in the fumarolic gases of La Soufrière volcano have been quite homogeneous and stable over the last thirty years. The average ratio of 8.2 ± 0.2 R a confirms that the volcano is tapping a MORB-like mantle source. In contrast, the nearby Bouillante geothermal system displays a much lower 3 He/ 4 He ratio (4.5 ± 0.1 R a ). He-C elemental and isotopic relationships show that both systems are actually fed by the same magmatic source, and that their marked difference in 3 He/ 4 He results from the 4 He contamination of the Bouillante deep aquifer by the surrounding wallrock. This conclusion is strengthened by the spatial distribution of 3 He/ 4 He ratios which shows that La Soufrière fumaroles and the Bouillante geothermal system are the two end-members of a spatial trend of decreasing 3 He/ 4 He ratio with distance from La Soufrière summit dome, implying an increasing addition of radiogenic 4 He from the host rocks away from the present-day active volcanic edifice.

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Section: Discussionmentioning

confidence: 99%

Helium isotope systematics of volcanic gases and thermal waters of Guadeloupe Island, Lesser Antilles

Jean‐Baptiste

Allard

Fourré

et al. 2014

Journal of Volcanology and Geothermal Research

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“…The relation between air-corrected 3He/4He ratio and distance of the sampling location from the central cone Kamiyama (Fig. 3(b)) indicates that (1) 3He/4He ratios of samples within the caldera of Hakone volcano are high and uniform, (2) magmatic components in the Yufune and Nakagawa samples are assumed to have been derived from the Hakone volcano, because there is no other near-by Quaternary Figure 4 compares the air-corrected 3He/4He distribution and least-squares fit for the Hakone volcano with those of other volcanoes, such as Ontake volcano, Japan (Sano et al, 1984), Nevado del Ruiz volcano, Columbia (Williams et al, 1987;Sano et al, 1990), and Kusatsu Shirane volcano, Japan (Marty et al, 1989). There is a general trend of 3He/4He ratio decreas ing with distance from the main cone of each volcano.…”

Section: Resultsmentioning

confidence: 99%

“…Distinct S wave reflectors at shallower depths of 10-18 km in or around the low-velocity zones observed in various volcanic regions in Japan are inferred to correspond to the upper surface of magma bodies. Geochemical investigation based on the (Sano et al, 1984), Nevado del Ruiz (Williams et al, 1987;Sano et al, 1990) and Kusatsu-Shirane (Marty et al, 1989). Distance from the main cone (km) of 3He/4He ratio distribution helium isotope measurement may provide vital information of the distribution and movements of magma bodies.…”

Section: Resultsmentioning

confidence: 99%

“…Previous investigations revealed that spatial distribution of the 3He/4He ratios in volcanic regions is not uniform but varies con siderably, reflecting the distance of sampling sites from the magma sources (Sano et al, 1984;Williams et al, 1987;Marty et al, 1989;. Both volcanic activity and earthquake occurrence in the area are related to the size and location of deep-seated magmatic bodies.…”

Section: Introductionmentioning

confidence: 99%

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3He/4He ratio distribution in and around the Hakone volcano.

1992

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To investigate a fine structure of the 3He/4He ratio distribution in and around a single volcano, fumarolic gases, geothermal gases and waters were collected at 13 sites within the caldera of the Hakone volcano, Japan. The 3He/4He and 4He/20Ne ratios vary from 6.7 x 10-6 to 9.6 x 10-6, and 0.85 to 26, re spectively. The 3He/4He ratios, corrected for air contamination, of samples within the caldera are uniform and as high as those of magmatic fluids in the Japanese Islands. The 3He/4He ratios of two geothermal water samples outside the caldera are significantly lower than those of inside. The observed 3He/4He ratio distribution is interpreted as an indication of the presence of source magma with a high 3He/4He ratio beneath the volcanic region .

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“…First, a decreasing trend of helium isotopes was found with increasing distance from the central cone to the sampling sites (Sano et al, 1984). Such a tendency may be characteristic of 3 He emission in volcanic areas and suggested that magmatic helium was carried with fluid-flowing through a conduit.…”

Section: Introductionmentioning

confidence: 93%