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• W4220912671 endingPage "851" @default.
• W4220912671 startingPage "846" @default.
• W4220912671 abstract "Plate tectonics shapes Earth’s surface, and is linked to motions within its deep interior1,2. Cold oceanic lithosphere sinks into the mantle, and hot mantle plumes rise from the deep Earth, leading to volcanism3,4. Volcanic eruptions over the past 320 million years have been linked to two large structures at the base of the mantle presently under Africa and the Pacific Ocean5,6. This has led to the hypothesis that these basal mantle structures have been stationary over geological time7,8, in contrast to observations and models suggesting that tectonic plates9,10, subduction zones11–14 and mantle plumes15,16 have been mobile, and that basal mantle structures are presently deforming17,18. Here we reconstruct mantle flow from one billion years ago to the present day to show that the history of volcanism is statistically as consistent with mobile basal mantle structures as with fixed ones. In our reconstructions, cold lithosphere sank deep into the African hemisphere between 740 and 500 million years ago, and from 400 million years ago the structure beneath Africa progressively assembled, pushed by peri-Gondwana slabs, to become a coherent structure as recently as 60 million years ago. Our mantle flow models suggest that basal mantle structures are mobile, and aggregate and disperse over time, similarly to continents at Earth’s surface9. Our models also predict the presence of continental material in the mantle beneath Africa, consistent with geochemical data19,20. Reconstruction of one billion years of mantle flow shows that mobile basal mantle structures are just as consistent with the Earth’s volcanic history as are fixed mantle structures." @default.
• W4220912671 created "2022-04-03" @default.
• W4220912671 creator A5009869062 @default.
• W4220912671 creator A5032050472 @default.
• W4220912671 creator A5038326726 @default.
• W4220912671 creator A5051523448 @default.
• W4220912671 date "2022-03-30" @default.
• W4220912671 modified "2023-10-14" @default.
• W4220912671 title "Assembly of the basal mantle structure beneath Africa" @default.
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• W4220912671 doi "https://doi.org/10.1038/s41586-022-04538-y" @default.
• W4220912671 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35355006" @default.
• W4220912671 hasPublicationYear "2022" @default.
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