Petrochemical features of the association of ultrabasic alkali rocks and carbonatites of the Tomtor massif and interpretation of possible trends of their evolution

Petrochemical characteristics of the series of silicate rocks, alkali utrabasic rocks and syenites with carbonatites of the Tomtor massif are given, and the change in their compositions is analyzed using experimentally studied triple diagrams of phase states. In the process of such analysis on different cross sections of “the extended basalt tetrahedron” Ne-Fo-SiO2-La, covering both quartznormative (tholeiitic), and nephelinenormative (alkali) basalts, possible trends of evolution of the Tomtor ore-magmatic system are interpreted. Existence of such polychromous complicated ore-magmatic ring complexes as Tomtor massif indicates occurrence of intraplate deep large magma-generating hearths in lithosphere mantle. Extraordinary complex precious–rare-metal ore content, wide variety of igneous rocks from ultrabasic to middle magmatites, enriched with volatile and ore components, are signs of non-depleting primary melts. Such easily fusible hearths, conserved in lithosphere mantle of residual melts of kimberlite, alkali-basaltoid, lamproite, carbonatite compositions, under the subsequent favorable geodynamic settings, are subject to rapid flotation, undergoing decompression melting and forming concentric-zonal platform complexes of alkali ultrabasic rocks with carbonatites. The Phanerozoic alkali-ultrabasic complexes of the rocks are predominantly confined to the periphery of the Siberian platform, and its related to location of their potential hearths during formation of large igneous provinces as a result of breakup of the Rodinia supercontinent with a divergence North-Asian (Siberian) and North-American (Laurentia) cratons, which began in the Neoproterozoic.

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