It had already been argued, in the 1970s, that these plumes might originate from the boundary between the mantle and the core, at a depth of 2,900km. It could transform the power of computers too Read More: Noise in the brain enables us to make extraordinary leaps of imagination. In the 1980s, one study showed that kimberlite eruptions might be linked to small thermal plumes in the mantle – feather-like upward jets of hot mantle rising due to their higher buoyancy – beneath slowly moving continents. For decades, geophysicists have used computers to study how the mantle slowly flows over long periods of time. Most of them were found in Canada (178 eruptions), South Africa (158), Angola (71) and Brazil (70).īetween Earth’s solid crust and molten core is the mantle, a thick layer of slightly goopy hot rock. Hundreds of these eruptions that occurred over the past 200 million years have been discovered around the world. Kimberlite eruptions leave behind a characteristic deep, carrot-shaped “pipe” of kimberlite rock, which often contains diamonds.
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