A Kimberlite, Its Mineralogy, and Implications

Abstract

<p> Kimberlite diatremes from a single genetic source were examined. Macrocryst and groundmass constituents were identified, as well as their alteration products. It was hypothesized that carbon dioxide and water vapour were present at the time of formation. Limestone inclusions and peridotite xenoliths were examined, as well as fabrics within the xenoliths. It was concluded that water is present in the upper mantle. Ilmenite nodules were determined to be phenocrysts, as opposed to xenocrysts. A paragenetic sequence for the kimberlite was resolved. Ilmenite was classified as the best indicator mineral for exploration purposes.</p>