Deep Beneath Yellowstone, Scientists Discover a Giant “River” of Hot Rock That May Be Driving It

Key Points:

• A new study published in Science challenges the long-held belief that Yellowstone is powered by a deep vertical mantle plume, instead suggesting it is fueled by a broad, slow-moving flow of hot rock beneath North America linked to the remnants of the Farallon Plate.
• The research reveals Yellowstone's magma system is more scattered and constantly evolving, with magma stored primarily in a thick, sticky magma mush rather than a single large underground reservoir, and fully liquid magma pockets forming only shortly before eruptions.
• This mantle flow causes decompression melting beneath thicker parts of the lithosphere, generating magma without the need for heat from a deep plume, thus revising the understanding of Yellowstone's volcanic activity.
• The study also identifies opposing forces in the crust that create a channel-like structure beneath Yellowstone, guiding magma movement and supporting a model of a broad, connected volcanic system rather than a singular magma chamber.
• Given Yellowstone's history of massive supereruptions, understanding this complex magma system is crucial, as future eruptions could have severe consequences and significant societal impacts.