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

Contributions to Mineralogy and Petrology

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DOI: 10.1007/BF00373077

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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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Nd and Sr isotopic studies on cenozoic mafic lavas from West Antarctica: Another source for continental alkali basalts
Series title:
Contributions to Mineralogy and Petrology
DOI:
10.1007/BF00373077
Volume
83
Issue:
1-2
Year Published:
1983
Language:
English
Publisher location:
Springer-Verlag
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Contributions to Mineralogy and Petrology
First page:
38
Last page:
44
Number of Pages:
7