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Nature 420, 281-282 (21 November 2002) | doi:10.1038/420281a
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Postdoctoral Fellow in Immunology
- The Scripps Research Institute
- N Torrey Pines Rd, San Diego, CA, USA
Head of Analytical R&D
- Syngene International Limited
- Bangalore 560 099 India
Earth science: Ancient mantle in a modern plume
Elisabeth Widom
Abstract
Osmium isotopes record evidence for 2.5-billion-year-old mantle beneath the Azores. The origin of this ancient mantle has implications for the nature and timescale of mantle convection.
The evolution of the Earth's interior is largely controlled by plate-tectonic processes. Convection of the mantle delivers hot material to the surface from depth — both at mid-ocean ridges, where shallow mantle melts to form new basaltic oceanic crust, and beneath ocean islands such as Hawaii, where rising mantle plumes melt to produce hotspot volcanism.
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