Os, Sr, Nd, and Pb isotope systematics of southern African peridotite xenoliths: Implications for the chemical evolution of subcontinental mantle
Twelve peridotite xenoliths from the Jagersfontein, Letseng-la-terae, Thaba Patsoa, Mothae and Premier kimberlites of southern Africa were analysed for Os, Sr, Nd and Pb isotopic composition. 187Os186Os for 9 of the 12 samples, including both low-and high-temperature peridotites, are below any publi...
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| Veröffentlicht in: | Geochimica et cosmochimica acta 1989-07, Vol.53 (7), p.1583-1595 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
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| Zusammenfassung: | Twelve peridotite xenoliths from the Jagersfontein, Letseng-la-terae, Thaba Patsoa, Mothae and Premier kimberlites of southern Africa were analysed for Os, Sr, Nd and Pb isotopic composition. 187Os186Os for 9 of the 12 samples, including both low-and high-temperature peridotites, are below any published value for the present mantle. Initial 187Os186Os in the peridotites show some correlation with Mg/Fe suggesting that the Re-Os fractionation was caused by melt removal that occurred at least 2 Ga ago. Sr and Nd isotopic compositions (87Sr86Sr = 0.7059 to 0.7078, ϵNd = −7.4 to −21) for acid washed clinopyroxenes from samples equilibrated at low temperature ( |
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| ISSN: | 0016-7037 1872-9533 |
| DOI: | 10.1016/0016-7037(89)90240-8 |