Genetic relations among the volcanic rocks of Réunion: chemical and lead isotopic evidence

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Scientific paper

Lead isotopic compositions and major element chemical data are presented for volcanic rocks from the younger Oceanite Series and Differentiated Series of volcanic rocks from the island of Réunion, Indian Ocean. Several lead isotopic domains are identified, in contrast to the uniform strontium isotopic composition previously found for the island. The lead domains represent predominantly horizontal heterogeneity in the U / Pb ratio of the mantle under Réunion. The Differentiated Series lavas have chemical characteristics which are transitional from hypersthene normative in the older units to nepheline normative in the younger lavas. Although the differentiated lavas underwent extensive low pressure crystal fractionation, it is inferred that the parental magmas were also of transitional nature, and that parental magmas of the older members of the Differentiated Series were derived by a slightly greater degree of partial melting than parental magmas for the younger members.

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