Helium isotope evidence for magmatic gases in Lake Nyos, Cameroon

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environment and energy

Creator:

YujHirTakMin

Publisher:

Ame

Host:

We have measured ³He/ 4 He and 4 He/ 20 Ne ratios of gas samples collected at Lake Nyos where a toxic gas disaster occurred on August 21, 1986 and at Lake Monoun in Cameroon, West Africa. The ³He/ 4 He ratios, corrected for air contamination, are 5.39–5.75 R atm (where R atm is the atmospheric ratio of 1.40 × 10 −6 ) for Lake Nyos and 3.56 R atm for Lake Monoun. The data suggest a significant contribution of mantle‐derived helium in these Cameroon volcanic crater lakes. The origin of CO 2 gas “erupted” during Lake Nyos disaster is inferred to be of magmatic origin based on the high ³He/ 4 He ratio.

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Helium isotope evidence for magmatic gases in Lake Nyos, Cameroon

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