ALKALINE-CARBONATITE COMPLEXES AND CARBON ATITE CONDITIONS OF FORMATION

The intrusive-magmatic nature of carbonatites of different alkaline as sociations has been demonstrated based on the different geological cri teria, the presence of melt inclusions in the rock-forming minerals, a nd results of experimental study. The study inclusions of mineral-form ing media gave a quantitative estimation of TPX parameters of carbonat ite process. It confirms also the possibility of carbonatites formatio n as a result of silicate-carbonate luqiud immescibility. The evolutio n of the fluid-magmatic carbonate systems lead to combination of genet ically similar associations forming by different mechanisms: contact-r eaction, orthomagmatic, autometasomatic, and hydrothermal ones in the carbonatites.