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- W2074011594 abstract "REE distributions of an unusual suite of mantle-derived amphibole/apatite rich xenoliths have very steep, LREE-enriched chondrite-normalised patterns with no Eu anomalies. These are closely analogous to REE distributions of carbonatitic and kimberlitic rocks. A wide range in absolute abundances of REE reflects the varied mineral assemblages of this xenolith suite and, together with other trace element and volatile concentrations, supports an origin by fractionation of, or separation from, a volatile-charged LIL-enriched (possibly kimberlitic/carbonatitic) magma. Such a magma could be a medium for volatile transfer, addition of Ti, V, K and P, and LREE enrichment within the upper mantle. It is postulated that such metasomatism in the upper mantle is a necessary precursor to continental alkaline volcanism. Geochemical modelling based on REE suggests that a pyrolite source +0.35% apatite (total of 0.5% apatite), with amphibole accounting for all K2O, can yield basanitic liquids with approximately 1–10% partial melting if the source is LREE-enriched (La about 20 times chondrite and Yb about 4.5–5 times chondrite). REE and trace element contents of the host rocks indicate that little exchange of these elements has occurred between xenolith and host magma during transport and emplacement." @default.
- W2074011594 created "2016-06-24" @default.
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- W2074011594 date "1980-11-01" @default.
- W2074011594 modified "2023-10-03" @default.
- W2074011594 title "Mantle metasomatism—precursor to continental alkaline volcanism" @default.
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- W2074011594 doi "https://doi.org/10.1016/0016-7037(80)90230-6" @default.
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