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Earth science

Proposal with a ring of diamonds

Plate reconstructions show that ancient eruptions of diamond-bearing rocks occurred consistently above a ring-like region of plume-generation zones deep in Earth's mantle. Do such zones remain stationary?

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Figure 1: The Big Hole at Kimberley, South Africa.

R. DE LA HARPE/PHOTOLIBRARY.COM

Figure 2: Kimberlites, diamonds and supercontinents in time.

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Evans, D. Proposal with a ring of diamonds. Nature 466, 326–327 (2010). https://doi.org/10.1038/466326a

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