Scientists have discovered a giant, fan-shaped structure that connects several well-known basins deep beneath the East Antarctic Ice Sheet — and it may have formed in the breakup of the ancient supercontinent Gondwana.
The feature is the product of a tectonic process known as distributed rotational extension, in which Earth’s crust deforms outward from a fixed, central point, like fingers spreading out on a human hand. The gaps between the “fingers” in East Antarctica are…
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