Antarctica Glaciation Driven by Geological Uplift Rather Than Global Cooling

The vast East Antarctic ice sheet holds enough water to raise global sea levels by approximately 52 meters, yet the geological history behind its formation has long puzzled researchers. While global temperatures were dropping and carbon dioxide levels were declining during the transition from the Eocene to the Oligocene epoch, the two poles did not freeze simultaneously.

Tectonic Shifts and Mantle Waves

The origins of Antarctica’s icy transformation trace back to the breakup of the supercontinent Gondwana, which began roughly 170 εκατομμύρια χρόνια ago. As Antarctica and Africa drifted apart, the continent moved toward the South Pole, triggering significant geological changes deep within the Earth. According to the research, the separation of these landmasses allowed hot material from the mantle to rise, cool, and sink, creating what scientists call mantle waves that move beneath the crust for millions of years.

These waves are capable of traveling more than 1.000 χιλιόμετρα and have been linked to volcanic eruptions and the transport of diamonds to the surface. In the case of Antarctica, these mantle-driven processes removed sections of rock from the base of the continent, causing a gradual uplift of the land surface that reached deep into the interior.

The Rise of the Gamburtsev Mountains

Using advanced computational models, researchers reconstructed the evolution of the East Antarctic landscape. Near the coastline, the initial breakup of the continent created a steep geological formation exceeding two kilometers in height. Further inland, the mantle waves facilitated a long-term elevation change that migrated across the continent.

The uplift process took approximately 100 εκατομμύρια χρόνια to reach the Gamburtsev Mountains, a range located more than 1.500 χιλιόμετρα from the coast. Today, this entire mountain range remains buried under at least three kilometers of ice. This geological activity provided the necessary topography to facilitate the early accumulation of ice, explaining why Antarctica froze millions of years before the Arctic, even while the Southern Ocean’s surface waters remained relatively warm for another ten million years.