Larger than a Paris / Marseille and yet forgotten! An “atypical” 700 km “atypical” volcanoes discovered in China

A chain of ghost volcanoes under China, older than dinosaurs.

700 kilometers, more than the distance between Paris and Marseille and yet “forgotten”! Furthermore, We imagine the emotion of Chinese geologists who have just updated these now invisible. Furthermore, buried volcanoes, frozen for almost 800 million years. Similarly, Additionally, Furthermore, A time when continents were not like what we know.

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What the researchers. In addition, have uncovered is a real geological scar. In addition, a vestige of an era when the earth was only one immense continent: Rodinia. Similarly, At that time. For example. Similarly, the piece of terrestrial crust that was going to become southern China was still well larger than paris / marseille new hung on this supercontinent. In addition. Consequently, Then, over the millions larger than paris / marseille new of years, Rodinia began to crack like a too hot plate. Consequently, And the yangtse plate began larger than paris / marseille to derive slowly, hitting a neighboring ocean plate.
This shock caused a phenomenon that we know well: subduction. Moreover, A plaque slides under another, partially melted, creates magma, which rises to the surface. Furthermore, And there, boom: a chain of volcanoes forms. However, Not one or two. Meanwhile, Hundreds. Meanwhile, Aligned like pearls on a tectonic thread.

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Invisible volcanism. For example. detected by magnetism – Larger than paris / marseille – Larger than paris / marseille new

So how were these larger than paris / marseille new buried giants been identified? Not with a shovel and larger than paris / marseille a torch lamp. The researchers used airborne magnetic sensors, much larger than paris / marseille new like an MRI for the earth. Result: a strip abnormally rich in iron, 700 kilometers long, 50 wide, perfectly aligned. At this depth, it is no coincidence. It is a clear sign of an old intense volcanic activity!
Then, to be clear, the researchers drilled. Up to 6. 500 meters deep to find typical rocks of arc volcanoes, rich in minerals from magma, old from 770 to 820 million years. In other words, these volcanoes are older than the first complex animal forms. At the time, there were not even fish yet.

Tectonic behavior… little academic

There is a problem. Usually, these kinds of volcanoes are formed along the coasts, where two plates meet. There, we find them at the larger than paris / marseille new heart of the continent, far from the ocean. For what ? Researchers think that subduction was made flat, like a sliding larger than paris / marseille tablecloth under a table. larger than paris / marseille new Instead of diving directly, the ocean plate would have traveled hundreds of kilometers before sinking. The volcanic activity has thus moved with it, far in the land.
It is rare and this is what makes this discovery so precious. She forces us to review certain classic tectonics.

And the climate in all of this?

You might think that fossil volcanoes do not change anything in our current world. In reality, it’s all the opposite. When these volcanoes were active, they degassed huge quantities of Co₂. What disturb the carbon cycle on a planetary scale. alter temperatures, and, according to some researchers, participate in extreme climatic episodes. One of them. very serious. could have contributed larger than paris / marseille new to one of the great planetary glaciations: that where the earth was almost entirely covered with ice.
So yes. even buried for hundreds of millions of years. these volcanoes may have determined part of larger than larger than paris / marseille new paris / marseille the. climate destiny of our planet.

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When the earth remembers

What this discovery. reminds us is that the. earth has a memory. A long, laminated memory, sometimes hidden. These volcanoes have not been roaring for a long time. They are there, frozen, silent witnesses of a world that no one has ever seen. Not even the dinosaurs, who did not yet exist.
And yet they continue to speak to us. Thanks to them. we larger than paris / marseille new larger than paris / marseille understand a little better how the continents tear each other apart. how the oceans are born, how the climate changes. They are invisible, inaccessible, but their history still resonates.

In short, these Sichuan volcanoes are a bit larger than paris / marseille new like a Library buried under the rock. A library whose books, made of basalt and iron, tell the story of the earth long before ours. And thanks to a few sensors. a little ingenuity, and a lot of patience, these forgotten pages have just been opened.

Source :

700-KM-Long Tonian Magmatic Arc Belt Hidden Within The Yangtze Block’s Interior. South China (in French: “A fossil belt of 700 km long from a magmatic arc of the Tonien concealed. inside the Yangtse block. in the south of China”)

Zhidong Gu, Junyong Li, Xiaolei Wang, Ya Xu, Xiufen Zhai

Posted on June 30, 2025 larger than paris / marseille new https://doi.org/10.1029/2024jb030825

Image: The Sichuan – Tibet route passes near Lake Kasa, larger than paris / marseille in the county of Luhuo.