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The composition of clinopyroxenes from heavy mineral concentrates of the diamondiferous Mbuji-Mayi and Tshibwe kimberlites in the DRC have been studied to constrain the thermal and compositional state of the lithospheric mantle underlying the northeastern section of the Archaean Kasai craton of central Africa. Clinopyroxenes from Mbuji-Mayi fall into two populations, a larger subcalcic group (group 1; with Ca# between 41 and 45) and a smaller calcic group (group 2; with Ca# between 45 and 47) with group 2 cpx showing overall lower Al2O3 values and a trend of decreasing Al2O3 with increasing Ca# (Fig. 1). The group 1 cpx show an increase in Al2O3 contents with increasing Ca#. Both groups are relatively Cr-rich (Cr# ranging between 17.7 and 69.1) with group 1 having higher Cr contents, but they both show a broad increase of Cr# with increasing Mg#, and both groups display a broad range of Mg# (from 88.5 to 94 with group 2 cpx having higher Mg# on average than group 1). Both groups have high Na2O contents (ranging between 1.5 to 3.6 wt %) with group 1 extending to higher Na2O contents.

Geochemistry of peridotitic clinopyroxene from the diamondiferous Mbuji-Mayi and Tshibwe kimberlites (DRC): insight into the compositional and thermal state of the SCLM beneath the eastern Kasai craton