Hydrothermal Alteration Processes in Volcanic Islands
Summary
Hydrothermal alteration in volcanic islands arises when heat from magmatic intrusions drives the circulation of seawater or meteoric water through porous volcanic rocks. As fluids migrate, they dissolve primary minerals and precipitate secondary phases such as clays, zeolites and calcium silicate hydrates. These processes vary with temperature, pressure and fluid composition, producing distinct alteration zones that evolve over decades to millennia. Subaerial and submarine settings differ in fluid chemistry and cooling rates, yet both host dynamic mineralogical transformations. Alteration influences rock permeability and strength, controls the distribution of metal-rich deposits and sustains chemolithotrophic microbial communities. Globally, understanding these reactions informs geothermal energy development, volcanic hazard assessment and carbon sequestration strategies. Field studies and time-lapse drilling in young oceanic islands offer unique natural laboratories to track progressive changes in mineralogy, fluid pathways and biogeochemical interactions.
Research from Nature Portfolio
Recent studies of a 50-year-old basaltic tuff sequence at a volcanic island have mapped multi-stage palagonitisation in basaltic glass and the sequential crystallisation of secondary minerals. Detailed mineralogical analyses reveal how temperature gradients and fluid chemistry govern the precipitation of phillipsite, analcime and Al-tobermorite within vesicles and pore spaces. This work establishes a reference framework for evaluating how thermal regimes and host-rock composition steer reaction pathways in young pyroclastic deposits, offering benchmarks for analogous hydrothermal systems worldwide.
Hydrothermal Alteration Processes in Volcanic Islands publication trend
The graph below shows the total number of articles in hydrothermal alteration processes in volcanic islands across all publications each year (not limited to Nature Index journals).
Technical terms
Hydrothermal alteration: Chemical and mineralogical changes in rock induced by the circulation of heated fluids.
Palagonitisation: Transformation of basaltic glass into palagonite, a hydrated, iron-rich amorphous material.
Zeolites: Microporous aluminosilicate minerals that commonly precipitate from alkaline hydrothermal fluids.
Basaltic tuff: Fragmental volcanic rock composed of volcanic ash and lapilli derived from basaltic eruptions.
Al-tobermorite: A calcium silicate hydrate mineral that forms under moderate-temperature hydrothermal conditions.
References
- Authigenic mineralization in Surtsey basaltic tuff deposits at 50 years after eruption. Scientific Reports (2023).
- SUSTAIN drilling at Surtsey volcano, Iceland, tracks hydrothermal and microbiological interactions in basalt 50 years after eruption. Scientific Drilling (2019).
- Authigenic Mineral Texture in Submarine 1979 Basalt Drill Core, Surtsey Volcano, Iceland. Geochemistry Geophysics Geosystems (2019).
- Design of the subsurface observatory at Surtsey volcano, Iceland. Scientific Drilling (2019).
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