Friday , September 24 2021

Part of the Earth's water came out of the flow of hydrogen a long time ago.



Ocean formation

When you look at the sea, it is difficult to imagine the shaking body of water in any other way. However,2O, covering most of our planet's surface, was once something very different: the hydrogen store in our early solar system nebula. Only on Earth is this hydrogen mixed with oxygen to create the world of water we know today.

There are many theories surrounding the global global ocean formation. A comet with a lot of ice could supply our planet's water. The asteroids used less water, but were able to add supplies of Earth. "But there is another way to think about the origin of water in the formation of the solar system." Steven Desch, astrophysical professor and scientist at the University of Arizona State University (ASU) Earth Explorers (SESE) Desch said that the source of hydrogen can be the origin of water on Earth because it is rich in hydrogen and oxygen and rich in oxygen.

Space dust and gas

Hydrogen gas was one of the main components of the solar nebula, or gas and dust that form the sun and planets in our solar system.

When the planets are formed, the hydrogen from the solar nebula is incorporated into their interior. Desch and his team have found that most are locked down, but some can make up the entire ocean of the earth by combining oxygen from other materials on Earth.

So finding hydrogen on Earth's interior will give scientists an idea of ​​whether they have contributed to the ocean's water during Earth's formation.

To study this theory, the team measured the ratio of the normal hydrogen atom (H) to the Earth's "heavy" hydrogen (also known as D or H), the D / H ratio. Water dissolved in the mantle of the Earth's oceans has a D / H ratio of about 150ppm. The asteroid water has a D / H of about 140ppm and the comet water is 150ppm to 300ppm. This creates an asteroid (because the D / H of comet numbers is too high) is a more likely candidate than a comet.

Because the D / H of hydrogen in the solar nebula is very low – 21ppm – the researchers have previously discounted it as a source. Jun Wu, senior author and associate professor at SESE, said that ASL's Professor of School of Molecular Sciences said: The hydrogen that flows into the early Earth is a heavy hydrogen that undergoes a series of geochemical processes, resulting in a D / H ratio that we can see today. Then it could become another source of water on the planet.

To find out, the team created a computer model of the early Earth mantle and added it to the hydrogen to see what happened.

In addition to computer modeling, the team sampled the mantle rocks. "We calculated how much of the hydrogen dissolved in the mantle of this cement could end up in the core and then compared it with recent measurements of the D / H ratio of samples taken from the Earth's deep mantle," Desch said. said.

Based on dissolved hydrogen, the team hides the water in the two oceans on the Earth's mantle and hides four to five water in the core. They estimate that one out of every 100 water molecules on the planet comes from the Solar System nebula. Most of the rest comes from asteroids and some from comets.

The team will do this work on October 9 Geophysical Research Center.


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