A Nature Geoscience synthesis reframes Wilkes, Aurora, and the Lake Vostok basin as parts of a single fan shaped province, giving ice sheet modelers a new structural template for sea level relevant catchments.
Wilkes Basin, Aurora Basin, and the basin containing Lake Vostok have long appeared in glaciology textbooks as separate features beneath the East Antarctic Ice Sheet. A study published in Nature Geoscience on 3 June 2026 argues they are not separate at all, but parts of a single continent-scale structure the authors call the East Antarctic Fan-shaped Basin Province (EAFBP), formed by a process called distributed rotational extension. The reframing matters because basin geometry governs where subglacial water collects, how ice flows, and which catchments are most vulnerable as the climate warms.
The EAFBP stretches roughly 2,000 kilometers along the East Antarctic coastline, from Prydz Bay near 70°E to the Transantarctic Mountains near 160°E, and reaches inland to about 85°S. Its subglacial basins are V-shaped, aligned roughly north–south, and converge near the South Pole. Lead author Egidio Armadillo of the University of Genoa and colleagues describe the geometry with a "thumb and spreading fingers" image: a single root near the pole fanning outward toward the coast. The province is buried under more than three kilometers of ice in places, and the researchers reached this picture by stripping that ice off in their models and looking at the rebounded bedrock.
The mechanism the paper proposes is large-scale rotational extension tied to the breakup of Gondwana, the ancient supercontinent. As Gondwana fragmented, the crust beneath what is now East Antarctica appears to have rotated outward, opening the fan of basins in the process. The team frames the EAFBP as potentially one of the largest examples of rotational extension preserved in continental crust anywhere on Earth. The evidence is synthetic rather than a single new radar survey: Armadillo and co-authors combined subglacial topography, gravity, magnetic, seismic, and crust-and-lithosphere models to identify the unifying pattern.
Co-author Guy J. G. Paxman led the ice-removed rebounded-topography modeling, which shows that the fan pattern is bedrock-controlled, not an artifact of the ice load. In some places, removing the ice load could shift the bedrock upward by as much as a kilometer. That post-glacial rebound matters because it changes how the subglacial landscape is interpreted: the basins are ancient structures, not recent ice-carved features. Coverage has listed Paxman's affiliation as either Durham or Cambridge Geography, a minor discrepancy that does not affect the modeling results.
The constructive payoff is for ice-sheet modelers. Subglacial lakes, ice-flow pathways, and the catchments that drain into them are organized by basin geometry. Treating Wilkes, Aurora, and the Lake Vostok basin as one connected province gives modelers a single structural template for the region, rather than a patchwork of independently named features. That could change which areas of East Antarctica are flagged as vulnerable in long-term sea-level projections.
The findings come with a built-in caveat worth naming: the "discovery" framing that has appeared in some coverage is partly a re-synthesis of previously mapped basins into a single named physiographic province, not a new subglacial terrain image. The substance is the unification and the mechanism, not a single dramatic find. The paper is peer-reviewed, with explicit DOI, and the work was supported by the Italian National Antarctic Research Program. International collaborators include the University of Genoa and other European partners. Public-facing coverage carried by SciTechDaily has placed the result in a wider frame.
The natural watch item is whether ice-sheet models adopt the EAFBP framework for their next generation of East Antarctic simulations, and whether that adoption shifts the sea-level-relevant catchments that climate modelers flag as unstable.