In the bowels of the Earth it rains in reverse. Free Technical Library News

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It's raining in the bowels of the earth

13.07.2022

A few hundred kilometers from the earth's crust there is another ocean - magmatic. And its size, most likely, exceeds the area of the rest, terrestrial. This hot ocean is made up of water molecules mixed with molten rocks.

Previously, it was believed that the water from the underground reservoir does not come into contact with moisture from the Pacific, Atlantic, Indian and Arctic oceans.

Denis Andrault and Nathalie Bolfan-Casanova, geologists at the University of Clermont in France, have come up with a new concept that suggests that water does indeed seep through the mantle into the world's oceans. Geologists called this phenomenon mantle rain.

"Under the earth's crust there is a layer 410 kilometers thick, which contains many water molecules," explains Denis Andrault.

Forty years ago, scientists believed that water molecules do not rise through the mantle and the earth's crust to the ocean, but only make their way back to the bowels of the Earth. If this were the case, then the oceans on the planet would slowly decrease, constantly giving up part of the water to the mantle, the geologist argues.

Scientists discovered mantle rain when they examined how a tectonic plate and its associated fluid sink into the mantle. As the plate sinks, the temperature and pressure increase - and this leads to the melting of tectonic rocks, releasing water.

The mixture of molten rock and moisture then becomes light enough to begin to rise. In this case, the liquid reacts with the substances of the upper mantle and lowers the melting point - this caused an even stronger melting, as a result of which more water is released - and the cycle continues.

"Andro and Bolfan-Casanova's mantle rain model shows that there may be another way to transport water to the surface in addition to convection of the mantle itself," said Yoshinori Miyazaki of the California Institute of Technology.

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