Evolution of helium isotopes in the Earth's mantle

Cornelia Class () and Steven L. Goldstein
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Cornelia Class: Lamont-Doherty Earth Observatory of Columbia University
Steven L. Goldstein: Lamont-Doherty Earth Observatory of Columbia University

Nature, 2005, vol. 436, issue 7054, 1107-1112

Abstract: Abstract Degassing of the Earth's mantle through magmatism results in the irreversible loss of helium to space, and high 3He/4He ratios observed in oceanic basalts have been considered the main evidence for a ‘primordial’ undegassed deep mantle reservoir. Here we present a new global data compilation of ocean island basalts, representing upwelling ‘plumes’ from the deep mantle, and show that island groups with the highest primordial signal (high 3He/4He ratios) have striking chemical and isotopic similarities to mid-ocean-ridge basalts. We interpret this as indicating a common history of mantle trace element depletion through magmatism. The high 3He/4He in plumes may thus reflect incomplete degassing of the deep Earth during continent and ocean crust formation. We infer that differences between plumes and the upper-mantle source of ocean-ridge basalts reflect isolation of plume sources from the convecting mantle for ∼1–2 Gyr. An undegassed, primordial reservoir in the mantle would therefore not be required, thus reconciling a long-standing contradiction in mantle dynamics.

Date: 2005
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DOI: 10.1038/nature03930

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