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Release of mantle helium and its tectonic implications

Umeda, Koji; Ninomiya, Atsushi; Asamori, Koichi

Helium is the lightest noble gas and both stable isotopes, $$^{3}$$He and $$^{4}$$He, are produced in the crust in a ratio of $$sim$$ 0.02 R$$_{rm A}$$, with R$$_{rm A}$$ being the atmospheric $$^{3}$$He/$$^{4}$$He ratio of 1.4$$times$$10$$^{-6}$$. Higher values are an indication of helium from the mantle where $$^{3}$$He captured during planetary accretion has been stored. It has been suspected for some time that degassing of the planet does not occur homogeneously over the Earth's surface, but is rather concentrated along plate boundaries, where the dynamics of the lithosphere are more intense and mantle helium from the Earth's interior can be more easily transported to the surface. We indicate that the spatial distribution of $$^{3}$$He/$$^{4}$$He ratios in gas samples from crustal fluids are considered to provide potentially useful information for determining not only latent magmatic activity but also potential pathways for mantle volatiles, such as in tectonically active zones.

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