Comparative geochemical characteristics and genesis of large polystage plutons in the core and periphery of the different age areas of the Mongol-Okhotsk fold belt

摘要: The Early Mesozoic Baga-Khentey pluton is the fragment of Dauria-Khentey batholith, which could have formed due by mantle plume action on lower horizons continental crust within zone collisional compression closing Mongol-Okhotsk ocean. batholith and their peripheral zones possibly from crustal sources magma. Ikh-Narotin-Khid Massif located border rifting periphery Late area. petrographic geochemical affinity granitoids massif composition gneisses country rocks might indicate that this was substratum in formation palingenic granites calc-alkali series. distinctions rock large plutons consist minor differentiation probably related to anatexis conditions origin melts setting. extension setting favorable for deep magmatic melts.