Article Dans Une Revue Journal of Sea Research (JSR) Année : 2025

The EMSO-Azores deep-sea observatory: 15 years of multidisciplinary studies of the lucky strike hydrothermal system, from sub-seafloor to the water column

V. Ballu
Thibaut Barreyre
Cécile Cathalot
J. Escartin

Résumé

Faced with climate change and the increasing interest for the deep ocean and ocean resources exploitation in particular, there is an urgent need for more comprehensive studies of deep-sea ecosystems. Hydrothermal vents are key areas for thermo-chemical exchanges between the lithosphere and hydrosphere and host unique biodiversity.Since 2010, the EMSO-Azores observatory has maintained arrays of multidisciplinary sensors at the Lucky Strike Hydrothermal Field (LSHF; 1700 m water depth), on the slow spreading mid-Atlantic ridge. This infrastructure, combined with repeated yearly sampling during the MoMARSAT maintenance cruises, aims at understanding the feedbacks between tectonics, volcanism and hydrothermal circulation, the coupling betweenthese processes and the hydrothermal ecosystem, and their impacts on the water column. In this review, we summarize 15 years of integrated and multidisciplinary study at LSHF and discuss the societal relevance of this observatory. Hydrothermal circulation is strongly constrained by crust permeability and the availability of magmatic heat. Its variability accounts for the spatial heterogeneity of chemical fluxes and biological communities observed. Tidal modulation of seafloor pressure and near seafloor currents impact venting temperatures, species behaviour, and their physiology. Tidal currents also influence plume dynamics and facilitate particle export to the ocean. At pluri-annual scales, geological events (faulting, seismicity, and magmatic replenishment) have led to changes in fluid chemistry, impacting local microbial communities. However, results obtained over the 15 years of monitoring point to a relative stability of the overall vent system, challenging the idea that hydrothermal vents communities are highly dynamic and ephemeral habitats at decadal timescales.

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DOI

Est complété par 10.17882/101805 Jeu de données Chavagnac, V., Leroy, L., & Castillo, A. (2024). Geochemistry of hydrothermal fluids at the Lucky Strike Hydrothermal Field data from the EMSO-Azores observatory, 2024 [Data set]. SEANOE. https://doi.org/10.17882/101805

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DOI

Est complété par 10.17882/103187 Jeu de données Chavagnac, V., & Castillo, A. (2025). Geochemistry of hydrothermal fluids at the Lucky Strike Hydrothermal Field data from the EMSO-Azores observatory, 2025 [Data set]. SEANOE. https://doi.org/10.17882/103187

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Dates et versions

hal-05249535 , version 1 (11-09-2025)

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Marjolaine Matabos, Mathilde Cannat, V. Ballu, Thibaut Barreyre, Jérôme Blandin, et al.. The EMSO-Azores deep-sea observatory: 15 years of multidisciplinary studies of the lucky strike hydrothermal system, from sub-seafloor to the water column. Journal of Sea Research (JSR), 2025, 207, pp.102625. ⟨10.1016/j.seares.2025.102625⟩. ⟨hal-05249535⟩
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