New discovery: the earth drags huge amounts of sea water into the depths of the mantle2018-11-16 10:26:18 54 ℃
When the tectonic plates of the Earth move toward each other at the bottom of the ocean, they drag the seawater into the interior of the planet three times as much as previously thought.
These are the conclusions of a new paper published in the November 14 issue of Nature.
Using the seismic waves of the Marianas trench earthquake-oriented subduction zone, the researchers were able to estimate how much seawater was integrated into the deep depths of the rock.
Donna Shillington, a marine geology and geophysics researcher at the Lamont-Doherty Earth Observatory at the University of Costa Rica, wrote in the article that the findings have a major impact on understanding the Earth's deep water cycle. Water beneath the surface of the earth promotes the development of magma and can lubricate faults, making earthquakes more likely to occur.
Water is stored in the crystal structure of the mineral, and when a new, hot marine plate is formed, and when the plate is bent and broken, the liquid is incorporated into the earth's crust. The latter process is called subduction and is the only way for water to go deep into the ground.
Chen Cai, head of research at Washington University in St. Louis, said: "Before we did this research, every researcher knew that water had to be taken away by the subduction block, but they just didn't know how much water there was. "
The researchers used data from a seismic sensor network located in the middle of the Mariana Trench in the Western Pacific. The deepest part of the trench is located nearly 11 kilometers below sea level. The sensor detects the echoes of earthquakes and earthquakes and rings the crust like a bell. Cai and his team tracked the speed of these earthquakes: he said that slower speeds would indicate water-filled cracks in the rock and "hydrated" minerals that lock the water in the crystal.
Cai said the researchers observed this slowdown in the depths of the crust 30 kilometers from the surface. Using the measured speed, and the known temperature and pressure found there, the team calculated that the subduction zone would pull 3 billion megagrams of water (Tergram) into the crust every million years (one megagram equals one billion kilograms).
The seawater is actually very heavy, and the 1 meter long water cube weighs 1024 kilograms. However, the amount of water pulled down by the subduction zone is unbelievable. Cai said that this is also three times the amount of subduction water that was previously estimated to be absorbed.
This raises some questions. The researchers said that the newly estimated water volume decline is greater than the estimated amount of water ejected by the volcano, which means that scientists have missed something in the estimate. Cai said there is no water shortage in the ocean. This means that the amount of water that is dragged into the earth's crust and the amount of water that is ejected should be roughly equal. In fact, this is where scientists haven't understood, and they don't know how the water deep in the ocean moves inside the earth.
Guess you like
- 2018-12-04The SpaceX Falcon 9 rocket puts 64 satellites into orbit, and the rocket is the third to be reused.
- 2018-11-16"Artificial Sun" was born in China, the electronic temperature is as high as 100 million degrees, and Americans are the enemy.
- 2018-11-13The advantages of dark chocolate are quite a lot, but be careful not to eat with calcium-containing foods!
- 2018-11-13Self-assembled protein
- 2018-10-24Black holes are all understood! Then do you know what a white hole is?
- 2018-09-19What to eat determines what you want
- 2018-08-29A lightning bolt in the sky, how much electricity? The answer you can't think of
- 2018-08-19It’s coming, the Arctic permafrost is “suddenly thawed” and is expected to double by 2050.
- 2018-08-04unsolved puzzle! Why does the stone move by itself? Troubled by many scientists
- 2018-06-08It lived for 400 million years and was rescued by blue blood. But it was forced into desperation by human beings.
- Crossing the boundary of hybrid animals
- 70% probability! US NOAA authority forecast: El Nino or upcoming in autumn and winter
- There is no dry firewood seal, as long as there is a bed in the heart, wherever you can sleep, the leopard is cool...
- 20 moving pictures with feelings: these familiar things are produced in this way.
- The strongest hurricane hit the East Coast of the United States in 29 years! Looking at Hurricane Florence from space
- British supermarket pork detected deadly mutant bacteria, only because of the use of antibiotics that have been banned for two years in China
- Another creature is facing extinction! The last "land" of the Adelie penguin may be reduced by 50% in 10 years.
- Is this the most round sphere in the world? Countless scientists have been built for five years, what is the use?
- The Perseus ε meteor shower will be ushered in on September 10th, helping teachers festival
- How many earths are there in the universe?