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Primordial and recycled helium isotope signatures in the mantle transition zone.

著者 Timmerman S , Honda M , Burnham AD , Amelin Y , Woodland S , Pearson DG , Jaques AL , Le Losq C , Bennett VC , Bulanova GP , Smith CB , Harris JW , Tohver E
Science.2019 Aug 16 ; 365(6454):692-694.
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Isotope compositions of basalts provide information about the chemical reservoirs in Earth's interior and play a critical role in defining models of Earth's structure. However, the helium isotope signature of the mantle below depths of a few hundred kilometers has been difficult to measure directly. This information is a vital baseline for understanding helium isotopes in erupted basalts. We measured He-Sr-Pb isotope ratios in superdeep diamond fluid inclusions from the transition zone (depth of 410 to 660 kilometers) unaffected by degassing and shallow crustal contamination. We found extreme He-C-Pb-Sr isotope variability, with high He/He ratios related to higher helium concentrations. This indicates that a less degassed, high-He/He deep mantle source infiltrates the transition zone, where it interacts with recycled material, creating the diverse compositions recorded in ocean island basalts.
PMID: 31416962 [PubMed - in process]
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