Abstract

The mafic-ultramafic Ikauna intrusion is a well-differentiated complex comprising dunite (serpentinite), pyroxenite, gabbro and gabbro-pegmatite in southern part of the Bundelkhand craton. The metagabbro samples are characterized by Rb and Ba enrichment and positive Sr and Eu anomalies, as would be expected for the presence of cumulus plagioclase. The meta-dunites and metapyroxenites are marked by lower trace element abundances than the metagabbros and negative Sr anomalies, which might be related to fractional crystallization of plagioclase. The compositional characteristics of the Ikauna intrusion rocks discussed suggest that they are comparable with the layered intrusions of the peridotite-gabbronorite complex characteristic of the Karelian craton.

Keywords: Archean; layered intrusion; Bundelkhand craton; Mafic-ultramafic