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V. V. Vrublevskii V. V. Reverdatto A. E. Izokh I. F. Gertner D. S. Yudin P. A. Tishin 《Doklady Earth Sciences》2011,437(2):443-448
40Ar/39Ar isotopic ages of magnesioarfvedsonite (725.9 ± 6.3 myr) and phlogopite (637.6 ± 5.7 myr) from carbonatites of the Penchenga
rock complex located in the South Trans Angara segment of the Yenisei Ridge have been determined. Based on this, the formation
of the rock complex is associated with the start of the period of Neoproterozoic (725–700 Ma) rifting and alkaline magmatism
in the region, the latter being associated with the former. The appearance of zones penetrable for magma of the “disseminated”
rifting type is associated with the development of late collision shear dislocations in a consolidated marginal continental
crust. The primary melts had a plume nature, but matter from different mantle sources intermixed in the environment of the
changing geodynamic regime. The younger age of the mica was apparently caused by partial remelting of carbonatites under the
influence of heat and fluids generated during the formation of the adjacent large granite massif of a younger age. 相似文献