Article Dans Une Revue Geochemistry, Geophysics, Geosystems Année : 2025

Intermittently Bubbling Well With He-Rich N2-Bubbles Constrain the Possibility of Atmospheric and Biogenic N2 Exsolution and the History of He-Rich Groundwater From Basement to Surface

Résumé

Using Henry's law for di-nitrogen and simple budget equations, we show theoretically that generating ${\mathrm{N}}_{2}$ bubbles in spring water, by exsolution of atmospheric ${\mathrm{N}}_{2}$ formerly dissolved in recharge water, is possible if the water becomes warm and salty at depth in the basement before rising upward when pressure drop triggers bubble generation. Based on ${\delta }^{15}N$ results (Dantas Cardoso et al., 2023, https://doi.org/10.1016/j.chemgeo.2023.121588), we suggest that biogenic ${\mathrm{N}}_{2}$ may complement atmospheric ${\mathrm{N}}_{2}$, thus easing exsolution. This model is an alternative to the generation of ${\mathrm{N}}_{2}$ by mostly unknown metamorphic reactions in the basement. It can be coupled to Torgersen's equation (Torgersen, 1980, https://doi.org/10.1016/0375-6742(80)90021-7), describing long residence in the basement porosity, thus accounting for ${\mathrm{N}}_{2}$ bubbles with high He, as observed at the "Fontaines Salées" site, in the Morvan region of the northern Massif Central of France (Léger et al., 2025, https://doi.org/10.1029/2024gc012021).

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DOI

Cite 10.5281/zenodo.14234232 Jeu de données LEGER, E. (2025). Dataset for ‘Deciphering degassing mechanisms of He and H$_2$ at the sedimentary basin-basement interface by surface geophysics and gas geochemistry’ [Data set]. Zenodo. https://doi.org/10.5281/ZENODO.14234232

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insu-05537694 , version 1 (09-03-2026)

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P. Sarda, E. Léger, Alexandra Courtin, B. Saint‐bézar, Marc Nizet, et al.. Intermittently Bubbling Well With He-Rich N2-Bubbles Constrain the Possibility of Atmospheric and Biogenic N2 Exsolution and the History of He-Rich Groundwater From Basement to Surface. Geochemistry, Geophysics, Geosystems, 2025, 26, ⟨10.1029/2025GC012567⟩. ⟨insu-05537694⟩
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