Distribution of niobium, tantalum, and other highly incompatible trace elements in the lithospheric mantle: The spinel paradox

Because its crystal structure is unfavorable to large cations, the contribution of chromium-spinel to the trace-element budget of mantle rocks is generally thought to be negligible. Here we present a conflicting picture of trace-element distribution in spinel peridotites, emphasizing the strong capa...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 1996-02, Vol.60 (3), p.545-550
Main Authors: Bodinier, J.-I., Merlet, C., Bedini, R.M., Simien, F., Remaidi, M., Garrido, C.J.
Format: Article
Language:English
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Summary:Because its crystal structure is unfavorable to large cations, the contribution of chromium-spinel to the trace-element budget of mantle rocks is generally thought to be negligible. Here we present a conflicting picture of trace-element distribution in spinel peridotites, emphasizing the strong capacity of this mineral to trap highly incompatible elements, such as Nb, Ta, Rb, Ba, and U. This paradox is due to the existence of a very thin reactional layer (
ISSN:0016-7037
1872-9533
DOI:10.1016/0016-7037(95)00431-9