Abstract

A small, negative europium (Eu) anomaly in kimberlites has previously been attributed to the presence of perovskite (Mitchell and Brunfelt, 1973). Recent work on the distribution of rare earth elements between coexisting clinopyroxene and orthopyroxene indicates that a negative Eu anomaly in clinopyroxene is to be expected, depending on the proportions of Eu2+ and Eu3+, because of the difference in their ionic size. Consequently, if kimberlite magma is produced by partial melting of mantle that includes clinopyroxene, and the clinopyroxene breakdown contributes significantly to the melt formed, the melt must inherit a small, negative Eu anomaly.

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