Overview
- An international team led by Egidio Armadillo published a peer-reviewed map in early June that names the East Antarctic Fan-Shaped Basin Province and identifies roughly 30 elongated, wedge-shaped basins beneath the ice.
- The map combines airborne gravity and magnetic surveys, radio-echo sounding, seismic data, lithospheric models and a reconstructed 'rebounded' topography to reveal bedrock geometry hidden beneath up to several kilometres of ice.
- Researchers interpret the fan pattern as the product of distributed rotational extension, a form of crustal stretching tied to ancient tectonic segments and possibly linked to Gondwana breakup.
- Scientists say the basins underlie about half of the East Antarctic Ice Sheet and note that thinner crust, fault troughs and focused subglacial water in those basins could steer ice streams and concentrate heat flow, which may affect regional ice stability.
- Commentators and the authors emphasize that the next steps are targeted numerical modelling and new observations to test how much the basins alter present-day ice flow, subglacial hydrology and potential contributions to sea-level rise.