Something incredible lies beneath our feet—two giant structures deep inside Earth are changing how scientists think about mountain heights. A recent study published in Nature reveals that these subterranean giants stretch up to 1,000 kilometers (620 miles) high, dwarfing even Mount Everest by nearly 100 times. They are located beneath Africa and the central Pacific Ocean, characterized not by conventional rock formations but by their immense scale as the largest known features within the planet.
This discovery reshapes our understanding of Earth’s internal makeup and provides new insight into how planets evolve. These dense areas might be billions of years old, holding onto chemical clues from early Earth. They could also play a significant role in processes like volcano formation, plate tectonics, and mantle convection.
The groundbreaking research, led by Arwen Deuss from Utrecht University, utilized a method that tracks how the planet vibrates after major earthquakes. By studying these vibrations, researchers mapped how seismic energy travels through Earth’s mantle. They identified zones with low seismic wave velocity and weak energy loss, leading to the discovery of what are known as Large Low Shear Velocity Provinces (LLSVPs).
“These aren’t mountains in the usual sense,” the study explains. “They are thermochemical structures that impact mantle flow.” Each structure spans up to 5,000 kilometers wide. If brought to the surface, they would redefine what tall means entirely.
One intriguing aspect of LLSVPs is their origin. Researchers believe they are remnants of ancient tectonic plates that sank into the mantle billions of years ago. This accumulation at the base has created “slab graveyards,” where distinct materials resist mixing with the surrounding mantle. Their unique composition makes them stable and long-lasting features within Earth.
LLSVPs might also influence volcanic activity. Their presence just above the core positions them as potential sources for mantle plumes, which lead to hotspots like those in Hawaii and Iceland. The study hints at an ongoing relationship between these features and large-scale processes like plate movement and continent formation.
This model not only visualizes these underground giants but also helps scientists distinguish between temperature effects and chemical differences for the first time. This capability opens up new possibilities for understanding Earth’s geodynamic forces.
LLSVPs may act as anchors within the mantle, influencing convection currents and potentially affecting the long-term cycles of supercontinent formation. As most of the mantle undergoes mixing, these anomalies remain isolated, acting as reservoirs of ancient materials and possibly influencing surface climates and life on Earth.
With these findings, researchers can now dive deeper into the discussions around mantle dynamics, climate effects, and even how rocky planets might form and evolve. This study stands out in the growing quest to unravel the mysteries of our home planet.
For further reading, you can check the detailed study in Nature.
