期刊
WATER
卷 13, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/w13172413
关键词
hydrochemistry; isotope hydrology; geothermometry; mineral water; thermal water; gaseous springs; CO2; brines; Corsica
资金
- Culletivita di Corsica through the Ph.D. grant of Margaux Dupuy
- Culletivita di Corsica through the GERHYCO interdisciplinary project dedicated to water management, ecology and hydro-ecosystem services in insular context
This study uses a combination of geochemical, isotopic, and geothermometry tools to identify various processes at the origin of diverse thermal and mineral waters, and to create the first conceptual groundwater-flow model.
Understanding hydrogeological processes at the origin of thermal and mineral groundwater are necessary to ensure their sustainable management. However, many processes are involved in their genesis and often only one or two processes are investigated at the same time. Here, we propose to use an innovative combination of geochemical, isotopic (S-34, C-14, O-18, H-2) and geothermometry tools to identify, for the first time in a multi-composite geological context, all processes at the origin of diversified thermo-mineral waters. 19 springs covering a wide range of temperature and chemical composition emerging on a restricted area of Corsica Island (France) were selected. Geochemical results highlight five geochemical provinces, suggesting a common origin for some of them. Geothermometry tools show the unexpected involvement of a common deep groundwater reservoir within this non-active zone. Water stable isotopes highlight a contrasted altitude in recharge areas supplying lowland springs. This suggests that different flow patterns have to be involved to explain the wide geochemical diversity observed and to allow the design of a very first conceptual groundwater-flow model. This paper demonstrates the efficiency of the combination of the selected tools as tracers of water-rock interaction, independently of flow depth, intrinsic water properties, geological conditions and interaction time disparities.
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