Sr-Nd-Pb isotopic systems in basalts of the Franz Josef Land Archipelago

Rb, Sr, Sm, Nd, U, and Pb contents and Sr, Nd, and Pb isotopic composition were determined in tholeiite and subalkaline basalts (in both whole-rock samples and individual minerals) from the Franz Josef Land Archipelago. Isotopic data obtained for the Arctic basin are similar to those for islands fro...

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Bibliographic Details
Published in:Geochemistry international 2006-04, Vol.44 (4), p.327-337
Main Authors: Levskii, L K, Stolbov, N M, Bogomolov, E S, Vasil'eva, I M, Makar'eva, E M
Format: Article
Language:English
Subjects:
Archipelagoes
Basalt
Crystallization
Mineralogy
Oceans
Rocks
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Summary:Rb, Sr, Sm, Nd, U, and Pb contents and Sr, Nd, and Pb isotopic composition were determined in tholeiite and subalkaline basalts (in both whole-rock samples and individual minerals) from the Franz Josef Land Archipelago. Isotopic data obtained for the Arctic basin are similar to those for islands from the Pacific, Atlantic, and Indian Oceans. The assimilation of crustal (sedimentary) rocks by primary depleted material makes isochron determination of basalt age difficult or impossible. The subalkaline basalts (basaltic andesites) were presumably formed by the metasomatic introduction of incompatible elements in tholeiitic basalts and, only partially, through crustal contamination and fractional crystallization.[PUBLICATION ABSTRACT]
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702906040021