Geochemistry

Constructing geochemical geometry

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Science  07 Nov 2014:
Vol. 346, Issue 6210, pp. 713-714
DOI: 10.1126/science.346.6210.713-g

Lavas erupted from oceanic hot spots have diverse chemistries that provide clues to the evolution of Earth's mantle. Jackson et al. develop a conceptual model of chemical variations within the mantle plume supplying the Samoan hot spot, by correlating geographic and geochemical variations in the erupted volcanic products. Lead and helium isotopes identify four distinct geochemical groups, all embedded in a common component that defines the mantle plume. The lens-like embedded materials appear to be isolated from one another, mixing only with the common component and creating compositionally distinct lavas in different spots along the Samoan hot spot track.

Nature 10.1038/nature13794 (2014).

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