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- W2381600577 endingPage "101" @default.
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- W2381600577 abstract "Abstract Chemical and isotopic heterogeneities in the lithospheric mantle are increasingly being recognised on all scales of examination, although the mechanisms responsible for generating this variability are still poorly understood. To investigate the relative behaviour of different isotopic systems in off-cratonic mantle, and specifically the origin of the regional southwest Pacific “HIMU” (high time integrated 238U/204Pb) Pb isotopic signature, we present the first U–Th–Pb, Rb–Sr, Sm–Nd and Re–Os isotopic dataset for spinel peridotite xenoliths sampling the subcontinental lithospheric mantle (SCLM) beneath Zealandia. Strongly metasomatised xenoliths converge to a restricted range of Sr and Nd isotopic compositions (87Sr/86Sr = 0.7028–0.7033; eNd ≈ +3–+6) reflecting pervasive overprinting of their original melt depletion signatures by carbonatite-rich melts. In contrast, rare, weakly metasomatised samples possess radiogenic Nd isotopic compositions (eNd > +15) and unradiogenic Sr isotopic compositions (87Sr/86Sr" @default.
- W2381600577 created "2016-06-24" @default.
- W2381600577 creator A5000339710 @default.
- W2381600577 creator A5038625124 @default.
- W2381600577 creator A5053671055 @default.
- W2381600577 date "2016-08-01" @default.
- W2381600577 modified "2023-10-09" @default.
- W2381600577 title "Rapid Cenozoic ingrowth of isotopic signatures simulating “HIMU” in ancient lithospheric mantle: Distinguishing source from process" @default.
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