Proposal with a ring of diamonds

摘要

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?rnDiamonds are formed only at great depths within Earths mantle, enduring there for billions of years until they are brought to the surface in explosive 'kimberlite' volcanic eruptions - named after the spectacularly diamond-rich Kimberley region of South Africa (Fig. 1).