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Article Dans Une Revue Communications Earth & Environment Année : 2024

Use of cold waters geochemistry as a geothermal prospecting tool for hidden hydrothermal systems in Réunion Island

Résumé

Most untapped high-enthalpy geothermal resources are blind, meaning lacking surface evidence of their existence. The first step in their discovery is to find evidence of hydrothermal activity. Here we apply an approach based on the geochemistry of cold waters, which allowed us to identify evidence of the existence of a hydrothermal system at Piton de la Fournaise volcano (Réunion Island), and constrain its location. This approach uses the concentrations in B, Li, SO 4 , F, Mo, P, V, As and HCO 3 and the isotopic ratios δ 13 C and δ 11 B as geochemical markers of hydrothermal activity that can be used even in waters with extremely low ion content (Electrical conductivity <80 µS/cm), and even when their geochemical composition is mainly controlled by other processes. This noninvasive approach is easy to implement and can be applied wherever the presence of a blind geothermal system is suspected.
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Dates et versions

hal-04437924 , version 1 (05-02-2024)

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Bhavani Bénard, Vincent Famin, Pierre Agrinier, Pascale Louvat, Geneviève Lebeau, et al.. Use of cold waters geochemistry as a geothermal prospecting tool for hidden hydrothermal systems in Réunion Island. Communications Earth & Environment, 2024, 5 (1), pp.55. ⟨10.1038/s43247-024-01210-3⟩. ⟨hal-04437924⟩
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