Hidden Supercontinents Discovered Deep Beneath Earth’s Surface
A Groundbreaking Study Challenges Long-Held Assumptions
Astonishingly, scientists have found evidence against the notion of Earth's mantle as a consistent layer of solid rock. Deep inside the mantle, a fresh investigation shows the presence of big, unmixed regions—like pieces of chocolate in a cookie.
Said to be supercontinents, these hidden structures underlie Africa and the Pacific Ocean. Scientists suggest that their possible age is much more than previously believed; they would therefore be anchors in the mantle guiding the interior operations of Earth.
Seismic Like uncovers old Mantle Features
Using a unique technique to examine earthquake-related seismic data, researchers found these enigmatic landmasses. Published in Nature, their results indicate these supercontinents comprise approximately 20 per cent of the mantle-core boundary. Although earlier seismic research suggested they existed, their provenance and life span have still been a matter of argument.
Dr. lead investigator Utrecht University's Sujania Talavera-Soza pointed out that earlier research revealed seismic waves slowed down by roughly 2% going through big low shear velocity provinces (LLSVPs). This implied the regions were warmer than the surrounding mantle, but their construction differences were not obvious.
A New Approach to Understanding the Mantle
Researchers in this most recent study looked at how the magnitude of seismic signals varied as they passed through the mantle. Slowed in LLSVPs but losing much energy, seismic waves slowed down in LLSVPs. Still, significant damping was seen in the cooler regions throughout.
This finding suggests that these deep-mantle formations vary markedly from their surroundings, perhaps because of their age and composition. Study collaborator Doctor Also hailing from Utrecht University, Arwen Deuss thinks this study will inspire more research to solve questions still outstanding on the deep interior of Earth.
Implications for Earth's Internal Processes
The presence of these concealed supercontinents might change our knowledge of mantle activity and plate movement. The mantle seems to have old, unmerged forms which might have a considerable effect on the geological development of Earth rather than a well-mixed layer.
New knowledge on the deep past of the planet and the current forces changing its surface could arise as researchers keep studying these enormous formations.