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The team reported in June in Nature Geoscience that the plume isn’t a simple column. Nearly a decade later, the team has revealed that the mantle is stranger than expected.
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In 2012, a team of geophysicists and seismologists set out to map the plume, deploying a giant network of seismometers across the vast depths of the Indian Ocean seafloor. A giant asteroid strike would be the coup de grâce for the dinosaurs, but the Deccan Traps have long muddled the picture of the climatic conditions the dinosaurs had to contend with.
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The plume’s effects are hard to miss: One of the island’s two massive volcanoes, the aptly named Piton de la Fournaise or “peak of the furnace,” is one of the most hyperactive volcanoes on the planet.īut the plume’s modern-day punch is nothing compared to its past.Īround 65 million years ago, when the plume was under what is now India, a series of lava floods named the Deccan Traps smothered 1.5 million square kilometers of land - enough to bury Texas, California and Montana - in a mere 700,000 years, a geologic heartbeat. It sits above one of Earth’s mantle plumes - a tower of superheated rock that ascends from the deep mantle and flambés the bases of tectonic plates, the jigsaw pieces that make up the ever-changing face of the world. Réunion, a French island in the western Indian Ocean, is like a marshmallow hovering above the business end of a blowtorch.