Trace element geochemistry of phlogopite-rich mafic mantle xenoliths: their classification and their relationship to phlogopite-bearing peridotites and kimberlites revisited

Kimberlite magmas from the Kimberley area of South Africa have sampled two main types of phlogopite-rich mafic xenoliths which represent deep mantle segregations from highly alkaline melts. The first group corresponds tothe MARID rocks characterised by the mineral association mica (phlogopite)-amphibole (K-richterite)-rutile-ilmenite-clinopyroxene and the second group consists of the PIC rocks characterised by the mineral association mica (phlogopite)-ilmenite-clinopyroxene-minor rutile.