Formation typification of the Kungussky and the Kulizhinsky mafic-ultramafic massifs (NW of Eastern Sajan)

Ultramafites and mafites are considerably distributed among the greenstone belts of the Kansky block. They are mapped in the form of numerous massifs, more often of small sizes, and they draw attention of many researchers in connection with their potential ore bearing capacity. However, their formation belonging often appears debatable and demands further studying. The purpose of the present research was the rocks of Kungussky and Kulizhinsky early-proterozoic mafic-ultramafic massifs, which are located in the southwestern part of the Kansky block (NW of Eastern Sayan). The offered petrographic and petrochemical research of the rocks allowed to consider Kungussky and Kulizhinsky massifs as peridotite-pyroxenite-gabbro formation and to establish their essential similarity. The petrochemistry of the rocks of the compared massifs has shown that during the early stage of differentiation of the initial basic fluid it may have divided into the derivatives: the ultra basic and the basic fluid. Later each of these fluids underwent its own evolution in the intermediate chambers in the course of differentiation with the formation of the directed series of rocks. The infusion of the ultra basic and basic fluids, obviously, occurred at various times at the same sites of the lithosphere. It has led to the formation of the ultramafic-mafic intrusion with a complex internal structure

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