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- W2085705736 abstract "The presence of negative cerium anomalies in island arc lavas has been considered enigmatic. Such negative Ce anomalies must be inherent in the source region and can be produced by subducting pelagic sediments + seawateraltered basalts (SWAB) into the mantle. A mantle peridotite from the Malaitan alnöite also contains a negative Ce anomaly, which can be produced by sediment recycling into the upper mantle. However, in spite of the poorly defined effects of cryptic metasomatism and associated ƒO2 conditions, such a process also seems plausible for the generation of negative Ce anomalies. In order to define the petrogenesis of this peridotite within the constraints of the present experimental data, we have attempted various mixing models with the end-members: mantle peridotite, Pacific sediment and seawater-altered basalt. In our model, it was assumed that negative Ce anomalies cannot be produced by magmatic or metasomatic processes. Best results were obtained from mixing a maximum of 3 to 5% seawater-altered basalt and 2 to 3% pelagic sediment, with a LREE-enriched mantle precursor. Our model stresses the importance of the contribution that recycled crustal materials can have on the composition of the upper mantle, in particular the recognition of a crustal signature in a mantle regime." @default.
- W2085705736 created "2016-06-24" @default.
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- W2085705736 date "1989-05-01" @default.
- W2085705736 modified "2023-10-17" @default.
- W2085705736 title "A negative Ce anomaly in a peridotite xenolith: Evidence for crustal recycling into the mantle or mantle metasomatism?" @default.
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- W2085705736 doi "https://doi.org/10.1016/0016-7037(89)90208-1" @default.
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