Nd and Sr isotopic studies on cenozoic mafic lavas from West Antarctica: Another source for continental alkali basalts

Futa, K.; Le, Masurier, W. E.

Abstract:

The Nd and Sr isotopic ratios on a suite of continental alkali basalts from Marie Byrd Land, West Antarctica, define a change in the source over the range of K/Ar dates between 1 and 28 m.y. ago. The 87Sr/86Sr isotopic ratios (0.7026 to 0.7031) are unusually low for continental alkali basalts, although the corresponding 143Nd/144Nd ratios (0.51283 to 0.51299) are similar to previously reported values. On a 87Sr/86Sr vs. 143Nd/144Nd diagram, they define a trend on the low 87Sr/86Sr side of the "mantle array", which has a slope steeper than the mantle array. An explanation for the light rare earth elements (LREE) enrichment of the alkali basalts, with high 143Nd/144Nd ratios and low 87Sr/86Sr ratios, is suggested by a model which modifies the source region with a mantle-derived, CO2-enriched metasomatic fluid. ?? 1983 Springer-Verlag.

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70011580

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Futa, K.; Le, Masurier, W. E.

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1-2

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English

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Contributions to Mineralogy and Petrology

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Nd and Sr isotopic studies on cenozoic mafic lavas from West Antarctica: Another source for continental alkali basalts; 1983; Article; Journal; Contributions to Mineralogy and Petrology; Futa, K.; Le, Masurier, W. E.