Author: Rob M. Ellam

0000000000546808

AUTHOR

Rob M. Ellam

Helium–strontium isotope constraints on mantle evolution beneath the Roman Comagmatic Province, Italy

- European Social Fund - Scottish Universities - Carnegie Trust for the Universities of Scotland.

Constraints on mantle source and interactions from He-Sr isotope variation in Italian Plio-Quaternary volcanism

[1] Helium isotope ratios of olivine and pyroxene phenocrysts from Plio-Quaternary volcanic rocks from southern Italy (seven Aeolian Islands, Mt. Vulture, Etna, Ustica, and Pantelleria) range from 2.3 to 7.1 Ra. Importantly, the phenocryst 3He/4He correlate well with whole rock Sr isotopic composition (0.70309–0.70711), reflecting the mixing of two sources. A significant contribution of He from crustal contamination is recorded only occasionally (e.g., pyroxenes from Vulcano). When merged with data from the Roman Comagmatic Province, a remarkably strong near-linear He-Sr isotope correlation is apparent. The general northward decrease in 3He/4He corresponds to an increase in 87Sr/86Sr (and a…

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