Earth science: Plumbing nickel from the core.
Walter, Michael J. 1,*
[Miscellaneous] Nature. 493(7432):309-310, January 17, 2013.

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: Magmas that have erupted at Earth's surface reveal a potential new mantle source. This source, which is rich in nickel and has a primordial helium isotopic content, may have originated at great depth in the mantle. See Letter p.393

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