V.S. SHKODZINSKIY (DPAMGI SB RAS)

Reductive decomposition: A basis for the universal technique of analyzing rocks for noble metals content

Three new geodynamic settings associated with the presence of the global magmatic ocean that existed at an early stage of evolution have been identified based on the obtained data of hot heterogeneous accretion of the Earth. Evidence is given for the existence of a reverse geothermal gradient in the mantle at this stage and the lack of recent geodynamic settings. The latter emerged in the late Proterozoic after the mantle was heated by the core. Magmas were formed due to the fractionation of the magmatic ocean and by the decompression and frictional remelting of its differentiates.
Keywords: geodynamic settings, magmatic ocean, magma genesis.