Early Cretaceous alkali basalts and carbonaceous metasomatites in the Far East maritime region
For the first time K-Ar dating data (116-104 mln years) and geochemical composition characteristics are given for albian alkali basic rocks. The similarity of structural position, age, geochemical peculiarities implies the relation between graphite-ilmenite metasomatites and plum alkali basalts. Graphite-ilmenite metasomatites contain high concentrations of some rare and noble metals in the form of nano-admixtures and are regarded as products of plutonic reduced fluids. The revealed polychronic alkali basite belt controls the center of Dalnegorsk mineralization block with the unique in scale Paleogene deposit of skarn-borosilicate ores and accumulation of skarn and vein polymetal fields.