Origin of Helium and Associated Fluid in Fault‐Related Hydrothermal Systems of the Eastern Pyrenees
ABSTRACT Intense hydrothermal activity hosted by regional tectonic structures occurs in the Eastern part of the Pyrenees. Helium isotope ratios ( 3 He/ 4 He) in hot springs along the Têt (0.033–0.099 Ra) and the Tech (0.171–0.375 Ra) faults indicate different signatures from purely crustal to slightly contaminated by magmatic helium. 3 He/ 4 He ratio increased towards the East, consistently with the observed thinning of the continental crust. These results suggest localised and not interconnected hydrothermal systems at fault scale. The origin of magmatic helium contamination is discussed in the light of the Gulf of Lion geodynamic evolution and data from comparable orogenic hydrothermal systems in the Alps.
Authors
- Carolina Dantas Cardoso (ORCID: https://orcid.org/0000-0003-0581-4583)
- Julien Mercadier
- Raphaël Pik (ORCID: https://orcid.org/0000-0002-4802-471X)
- Delphine Charpentier (ORCID: https://orcid.org/0000-0002-0134-7108)
- Gaétan Milesi (ORCID: https://orcid.org/0000-0001-8658-9837)
- Manuel Moreira (ORCID: https://orcid.org/0009-0005-8878-0826)
Institutions
- Université d'Orléans (FR)
- Centre National de la Recherche Scientifique (FR)
- Centre de Recherches Pétrographiques et Géochimiques (FR)
- Laboratoire Chrono-Environnement (FR)
- Université Bourgogne Franche-Comté (FR)
- Institut des Sciences de la Terre d'Orléans (FR)
- GeoRessources (FR)
- Université de Lorraine (FR)
Publication Details
- Journal
- Terra Nova
- Published
- 2024-10-18
- DOI
- https://doi.org/10.1111/ter.12753
- Citations
- 2
- Primary Topic
- Geological and Geochemical Analysis
- Type
- article
- Field-Weighted Citation Impact
- 1.07
Funders
- Agence Nationale de la Recherche
- Centre National de la Recherche Scientifique
- Institut national des sciences de l'Univers