Some Features of the Study of Secondary Minerals of Kimberlite Rocks

The conducted studies have shown that kimberlite diatremes are characterized by individual features of the composi-tion of the main mass of the rocks that compose them. Sometimes composition differences are characteristic not on-ly of specific pipes, but even of individual bodies and blocks. The processes of serpentinization, carbonatization, chloritization and brucitization also have their own specific features in each diatreme. Individual properties are also characteristic of the main mass of kimberlites of secondary formations, consisting of two or more minerals. The ap-pearance of kimberlite rocks in diatremes is largely determined by the development of a complex of secondary min-erals that arose after the consolidation of rocks because of their endo- and exogenous transformations. The analysis of distribution of serpentine, phlogopite, chlorite, talc, calcite, dolomite, pyroaurite, brucite and their associations in kimberlites of the Siberian platform allowed us to consider the conditions of formation of individual new formations and to assess their role in the formation of the individual appearance of these diamond-bearing rocks. The differences of the latter are due to the intensity of development and uneven distribution of the main secondary minerals and their varieties. It was established that kimberlites underwent repeated changes during their formation, the inten-sity of which at different stages of diatreme formation has an individual character and depends on the specific condi-tions of mineral formation.