COMPOSITION OF SPINEL, ILMENITE, GARNET A ND DIOPSIDE INCLUSIONS IN PHLOGOPITE MACROCRYSTS FROM THE MIR KIMBERLITE

Macrocryst phlogopite and crystalline inclusions in it from the Mir ki mberlite pipe have been studied. The inclusions consist of spinel, ilm enite, garnet and diopside, with spinel found to be the most common in clusion. Compositionally, the inclusions are close to minerals in ultr abasic xenoliths. The relationship between the host mineral and the in clusions and indications of chemical equilibrium may be an indirect ev idence of their concurrent crystallization. The phlogopite is similar in composition to primary and secondary micas from xenoliths. Its pres ence in the kimberlite breccia is probably due to disaggregation of ma nle xenoliths of magmatic and metasomatic origin.