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HIMU (high-μ; 238 U/ 204 Pb) is a mantle reservoir that has been thought to form by subduction and subsequent storage of ancient oceanic crust and lithosphere in the mantle. In order to constrain the processes that acted on subducted materials over several billion years, we present precise Pb–Sr–Nd–Hf–He isotopic data together with 40 Ar/ 39 Ar and K/Ar ages of HIMU...
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