hydrothermal metamorphism

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hydrothermal metamorphism

geology

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June 29, 2026

Quick Summary

Hydrothermal metamorphism involves changes in rocks near the Earth's surface due to intense activity of hot water. This process is driven by circulating groundwaters heated by proximity to igneous materials, radioactive decay, or faulting.123

Key factors for hydrothermal metamorphism include:
* Hot water: Dissolves and transports minerals.2
* Interconnected openings: Allows solutions to move through rocks.2
* Sites for deposition: Locations where minerals can precipitate.2
* Chemical reactions: Triggered by boiling, temperature drops, mixing with cooler solutions, or reactions with the rock itself.2

Hydrothermal solutions can fill cavities or replace rocks, forming mineral deposits. This process is significant in areas like Yellowstone National Park and can lead to extreme migration of chemical elements and mineral concentration.21

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metamorphism
…than one metamorphic event; and hydrothermal metamorphism, the changes that occur in the presence of water at high temperature and pressure which affect the resulting mineralogy and rate of reaction.
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…than one metamorphic event; and hydrothermal metamorphism, the changes that occur in the presence of water at high temperature and pressure which affect the resulting mineralogy and rate of reaction.
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mineral
Occurrence and formation
…existing rock type, and (4) hydrothermal, in which minerals are chemically precipitated from hot solutions within Earth. The first three processes generally lead to varieties of rocks in which different mineral grains are closely intergrown in an interlocking fabric. Hydrothermal solutions, and even solutions at very low temperatures (e.g., groundwater),…
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…existing rock type, and (4) hydrothermal, in which minerals are chemically precipitated from hot solutions within Earth. The first three processes generally lead to varieties of rocks in which different mineral grains are closely intergrown in an interlocking fabric. Hydrothermal solutions, and even solutions at very low temperatures (e.g., groundwater),…
Read More

metamorphic rock
Hydrothermal metamorphism
Changes that occur in rocks near the surface where there is intense activity of hot water are categorized as hydrothermal metamorphism. Such areas include Yellowstone National Park in the northwestern United States, the Salton Sea in California, and Wairakei in
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Changes that occur in rocks near the surface where there is intense activity of hot water are categorized as hydrothermal metamorphism. Such areas include Yellowstone National Park in the northwestern United States, the Salton Sea in California, and Wairakei in
Read More

igneous rock
Pegmatites and late-stage mineralization
…up, and during these periods hydrothermal conditions normally obtain. These depend upon the continued presence of a typically aqueous fluid that further facilitates crystallization and exchanges of materials. It speeds up exsolution within homogeneous solid phases and devitrification of any glass that may be present, and it is a potent…
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…up, and during these periods hydrothermal conditions normally obtain. These depend upon the continued presence of a typically aqueous fluid that further facilitates crystallization and exchanges of materials. It speeds up exsolution within homogeneous solid phases and devitrification of any glass that may be present, and it is a potent…
Read More