RUI: A Petrologic Investigation into Mantle Xenoliths from Oahu: Origin and Significance of Glass-rich Pockets

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The geochemistry of the constituent minerals of spinel lherzolites suggests that the MORB-depleted lithosphere underwent significant enrichment in incompatible minor and trace elements during Koolau (tholeiitic) and Honolulu (alkalic) magmatic activity. An investigation into the enrichment processes has led to the development of the present 1 year proposal designed to explore the nature, chemical composition, and origin of isolated crystal-laden glass pockets, some of which may have activity provided the elements in which these xenoliths have been enriched. Extensive electron microprobe analysis (major and minor elements) and preliminary ion microprobe analysis (REES) of the phases in these pockets will be performed in this project. The results will allow evaluation of the various models concerned with origins of the various types of glasses found.