Hidrotermal

Hydrotermal, or hidrotermal in Portuguese, refers to processes and systems driven by the interaction of hot water with rocks. In geology, hydrothermal systems involve circulating hot, mineral-rich fluids within the Earth's crust, typically heated by cooling magma or by deep circulating groundwater. As these fluids move, they dissolve ions and metals and precipitate minerals when temperature, pressure, or chemical conditions change, leading to hydrothermal ore deposits.

Ore deposits formed by hydrothermal activity include vein, disseminated, and porphyry styles, often containing metals such as copper, gold, lead, zinc, and silver. Mineral assemblages commonly feature sulfides and silica-rich gangue minerals such as quartz. The distribution and characteristics of deposits are controlled by rock permeability, fluid pathways (faults, fractures), and magmatic heat sources.

In oceanography, seafloor hydrothermal systems on mid-ocean ridges produce black and white smoker vents, where superheated fluids mix with seawater and precipitate metal sulfides, building chimneys and mineral-rich zones.

In materials science, hydrothermal synthesis uses hot aqueous solutions to crystallize solids, enabling controlled formation of crystals, oxides, and nanomaterials under relatively mild pressures.

Geothermal energy also relates to hydrothermal concepts, with natural hydrothermal reservoirs used for direct heating or electricity generation.

The term is used across geology, mining, marine science, and materials science to describe the role of hot water in natural ore formation, geologic processes, and synthetic methods.