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Ru and W isotope systematics in ocean island basalts reveals core leakage
Ru isotopes are proposed as tracers for core–mantle interaction on Earth, and anomalies for ocean island basalts from Hawaii are reported that have higher ε100Ru than the ambient mantle.
Yet, alternative models have been proposed that conform with the chemical and isotopic variations observed in OIB, including the incorporation of material from stranded, late-accreted meteorites in the lower mantle 8, 11 or from different, early-formed silicate reservoirs 5, 12, 13. Extra Ru isotope data were determined for a 17.5 Ma picritic komatiite that formed as a part of the aseismic ridge of the Galápagos hotspot track accreted to the coast of Burica Peninsula in Costa Rica 52. Initial testing at lower extraction rates with no thermal insulation from Al foil fractions of Ru could frequently be detected in water droplets deposited in the closure of the oxidation vessel.
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