2020-11-20

The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

By yqqlm yqqlm

Life lies in movement, and the same is true for the planet of life—the earth! Not only does it revolve around the sun, it also revolves around its own axis. The more interesting thing is that, driven by the internal thermal energy, the six major plates divided by the earth’s crust have never ceased to tear and collide, form mountains and become seas, and form the most exciting macro-topographic changes on the earth.

getInterUrl?uicrIvZQ=1f83f796a2d1af1921b5aa0d7f9df69c - The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

When the tectonic plates collide with each other, Form a subduction zone. This area is also the most macroscopic, complex and important exchange place for energy and matter inside the earth. In the past, people could observe plate decomposition, mantle melting, deep water circulation, etc.tectonic transition events, the maximum depth is only More than 200 kilometers.

But recently, a Chinese geological team proudly claimed that they had won A new breakthrough, using a huge detection network composed of more than 300 seismic observation stations throughout Northeast China, successfully mapping out some ancient the Pacific OceanThe fragments of the seabed plate are now buried 644 kilometers underground!

getInterUrl?uicrIvZQ=2d84e499b61b9e2dda554077068ff5a4 - The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

and use the large amount of real data observed Multi-band receiving function waveform simulation drawing imaging. Geologists clearly showed the changes in the movement of the plates and the Moho of the subducting plates. It also reveals that the seabed remains of the ancient Pacific Ocean, the seawater originally entrained will be at a depth of 150 to 200 kilometers, and most of it will be released from the plates. But if in a cold subduction environment, a part of the water can still enter the deeper mantle through storage in minerals such as hard pillars and silicates.

getInterUrl?uicrIvZQ=1b3bc9d06d3a5b7ded98d4a286ba25f6 - The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

These new research results give the earth geology belt An important theoretical breakthrough! And in the form of professional academic papers, it was officially published in the authoritative academic journal”Nature”, which was recognized by the world’s peers.

getInterUrl?uicrIvZQ=eb6e256ac970275ad286c4a516218903 - The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

In the course of collision, one The plate was squeezed under another plate in the subduction zone, and finally pushed deeper into the earth. Through the efforts of the Chinese geological team, this epic phenomenon has been successfully shown to people in an unprecedented depth with the most vivid scientific patterns.

getInterUrl?uicrIvZQ=c418128dce0bde49a5d8c61f28370e6e - The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

An overview map of the Northwest Pacific subduction zone drawn by experts In the middle, we can see the subduction process of the plate:the downward subduction zone itself is located in the Far East, and the plate slopes downward at a relatively shallow 25 degree angle. The Japanese islands are also located more than 100 kilometers from this subduction plate.

Also thanks to this innovative imaging technology, scientists have a better understanding of what happens when the subducting slab reaches the mantle transition zone. Among them, it includes how much it will deform, how much water it will lose from the ocean crust, and so on.

getInterUrl?uicrIvZQ=7ec732473df406497ec878d79eae6e2f - The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

Through these studies, people once again deeply realize that The plate actually deforms a lot in the transition zone of the mantle, it becomes soft, so it is easy to deform. In the past, the biggest controversy was whether the water originally rich in ocean plates could be released to that depth. And now more evidence shows that far more water than people think may stay inside the plate in a specific form, and slowly enter deeper underground with it.

getInterUrl?uicrIvZQ=7770c34a8c7df9877c598919d7f5795b - The latest depth! The Chinese team mapped out:644 kilometers underground, fragments of the ancient Pacific plate

Many times, people cannot go deep into the bottom of the lithosphere , But through continuous technological progress, people have gradually gained more perception and knowledge of our planet, and once again sighed for the extraordinary workmanship of nature.