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• W2007204911 abstract "Isotopic ratios of Ce and Nd and abundances of rare earth elements (REEs) and Ba are reported for the iron-formations of the Archean Isua and Malene supracrustals, West Greenland. It is suggested that the Sm-Nd system of the Isua iron-formations was disturbed by metamorphisms at 1680 Ma (oxide facies iron-formation) and 2740 Ma (carbonate facies iron-formation). However, the Malene iron-formation samples show similar Nd isotopic ratios and REE patterns indicating that they suffered little disturbance after deposition at 2800 Ma. Initial ϵCe and ϵNd values estimated at 2800 Ma for the Malene iron-formation are close to CHUR (chondritic uniform reservoir); of 3 samples, two show negative ϵCe and positive ϵNd, and the other gives chondritic ϵCe and negative ϵNd These initial values suggest that the sources for the Malene iron-formation had a chiefly chondritic or rather mantle-like depleted nature without a notable long-term negative Ce anomaly. Similar REE features are indicated for the sources of the Isua iron-formation by the estimated initial ϵCe and ϵNd values at 3760 Ma of these samples." @default.
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• W2007204911 date "1990-04-01" @default.
• W2007204911 modified "2023-10-02" @default.
• W2007204911 title "Sources of iron-formations in the archean isua and malene supracrustals, West Greenland: Evidence from La-Ce and sm-nd isotopic data and REE abundances" @default.
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• W2007204911 doi "https://doi.org/10.1016/0016-7037(90)90445-q" @default.
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