Articles | Volume 26, issue 10
Hydrol. Earth Syst. Sci., 26, 2637–2648, 2022
Hydrol. Earth Syst. Sci., 26, 2637–2648, 2022
Research article
19 May 2022
Research article | 19 May 2022

δ13C, CO2 ∕ 3He and 3He ∕ 4He ratios reveal the presence of mantle gas in the CO2-rich groundwaters of the Ardennes massif (Spa, Belgium)

Agathe Defourny et al.


Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-611', Anonymous Referee #1, 15 Feb 2022
    • AC1: 'Reply on RC1', Agathe Defourny, 25 Feb 2022
  • RC2: 'Comment on hess-2021-611', Anonymous Referee #2, 26 Feb 2022
    • AC2: 'Reply on RC2', Agathe Defourny, 13 Mar 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to minor revisions (further review by editor) (23 Mar 2022) by Brian Berkowitz
AR by Agathe Defourny on behalf of the Authors (08 Apr 2022)  Author's response    Author's tracked changes    Manuscript
ED: Publish as is (13 Apr 2022) by Brian Berkowitz
Short summary
The Belgian city of Spa is known worldwide for its ferruginous and naturally sparkling groundwater springs that gave their name to the bathing tradition commonly called spa. However, the origin of the dissolved CO2 they contain was still a matter of debate. Thanks to new analysis on groundwater samples, particularly carbon and helium isotopes together with dissolved gases, this study has demonstrated that the volcanic origin of the CO2 is presumably from the neighboring Eifel volcanic fields.