400-mile arc of ‘fossilized volcanoes’ discovered within Yangtze Block interior

Around 800 million years ago, during the Tonian period, the Yangtze Block in South China experienced significant tectonic activity, in which the ancient supercontinent Rodinia broke off from the area that is now South China. This created the Yangtze Block plate, which then collided with the China Ocean Plate, causing an area of subduction—where the oceanic plate slides under the lighter continental plate. This process is known to result in the creation of a string of volcanoes on the surface.

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