Pycroilmenite from kimberlites of Daldyn field (Yakutia)

One of typical accessory minerals of kimberlites, namely, picroilmenite is taken for analysis of field structure. A composition of ilmenite is analyzed practically for all pipes of the Daldyn field. Majority of the kimberlite pipe groups into pockets. The diagram of distribution of MgO-C₂O₃ demonstrates a disposition nearness of the figurative points of picroilmenite average compositions from different pipes of single pocket. This testifies an united source of ilmenite such as magmatic zone that is formed with the essential participation of both astenospheric liquid and lithosphere. It is assumed that the different pockets of kimberlite field pipes had own magmatic zones.