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Home»Earth»High-Pressure Reactions Transform Impermeable Stones into Porous Sponges
Earth

High-Pressure Reactions Transform Impermeable Stones into Porous Sponges

September 25, 2024No Comments3 Mins Read
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When rocks buried deep beneath the Earth are hit by high-pressure reactions, they can become temporarily “porous,” allowing water to move through these typically impermeable materials, textmesseges have shown. So this has broad implications for appreciating things such as earthquakes, plate tectonics and how water cycles through the deep Earth.

High-pressure reactions can turn nonporous rocks into sponges
Photographs of natural rocks showing (a) hydration and (b) dehydration features. (a) Eclogite shear zone with eclogitization associated to deformation from Holsnøy, western Norway (60°35’11”N, 5°07’34”E). (b) Metamorphic olivine veins in antigorite serpentinite from the Erro Tobbio ultramafic rocks, Ligurian Alps, Italy (44°33’38.9″N, 8°48’49.5″E). Credit: Geochemistry, Geophysics, Geosystems (2024). DOI: 10.1029/2023GC011422

Moving on: Dehydration and Hydration fronts

This water is absorbed and released by rocks undergoing reactions in the deep Earth. These fluctuations can have huge impacts on other geological processes.

As certain minerals react at high temperatures and pressures, they produce the denser minerals that expel water from the rock, leaving a more permeable and less dense material. It is a dehydration reaction, and as the dehydration front moves through the rock it can induce earthquakes when it cracks.

Alternatively, some of the reactions cause rocks to behave like dry sponges and absorb water from its surroundings and become more dense. This And the Front Of Reaction Are Called A Hydration Reaction With Attentiveness That The Front Moves In The Direction of Flow On Water.

ANHUIMTs phrase modeling the water movement in refractory rocks due toDeveloper site Professorialoginsign up

By emulating the chemistry and physics taking place in real rocks, UChicago researcher Matthew Gilholme and his coauthors used mathematical models to see how water might percolate through typically impermeable rocks like those discovered in the mantle wedge, deep lithosphere, and lower crust. They formulated equations to approximate how porosity in the rock evolves as water percolates through.

The team performed simulations for a hydration front and for two dehydration fronts. Hydration takes the case when the water is moving into a stratum from an external source, and this front propagation has to move in accord with fluid flow. As water is expelled from the rock into the surrounding environment (simple dehydration) or squeezed out of the minerals and replaced by additional fluid filling newly created pores in the rock matrix (dehydration inflow).

In the end, however water is flowing through the rock, these reactions can create “transient permeability” within the rock — thus a way in for water where surrounding rocks prevented it from entering. The findings have major implications for a number of ideas on how water mediates geological processes deep in Earth’s interior.

Conclusion

This observation represented a breakthrough in our understanding of deep Earth processes, because it showed that high-pressure reactions could render non-porous rocks textured like sponges for periods of time under the extreme conditions present on the planet. The study will also open up a more structural understanding of the impacts of water cycling on phenomena such as earthquakes, plate tectonics, and how much water is moving in the deep lithosphere. Understanding how water moves in such rocks may help delineate what is going on beneath the surface layer of our planet.

Earthquakes Geophysics Hydrology Lunar Geology plate tectonics
jeffbinu
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Tech enthusiast by profession, passionate blogger by choice. When I'm not immersed in the world of technology, you'll find me crafting and sharing content on this blog. Here, I explore my diverse interests and insights, turning my free time into an opportunity to connect with like-minded readers.

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