Indirect crustal contamination: evidence from isotopic and chemical disequilibria in minerals from alkali basalts and nephelinites from northern Tanzania

Alkali basalts and nephelinites from the volcanic province of northern Tanzania contain pyroxene and nepheline show evidence for chemical and/or isotopic disequilibria with their host magmas. Five whole rock/mineral separate pairs were analyzed for Sr, Nd and Pb isotopic compositions.

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 1996-11, Vol.125 (4), p.277-292
Main Authors: Paslick, C. R., Halliday, Alex N., Lange, R. A., James, D., Dawson, J. B.
Format: Article
Language:English
Subjects:
Basalt
Chemistry
Equilibrium
Geology
Isotopes
Mineralogy
Minerals
Petrology
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Description
Summary:Alkali basalts and nephelinites from the volcanic province of northern Tanzania contain pyroxene and nepheline show evidence for chemical and/or isotopic disequilibria with their host magmas. Five whole rock/mineral separate pairs were analyzed for Sr, Nd and Pb isotopic compositions.
ISSN:0010-7999
1432-0967
DOI:10.1007/s004100050222