Geochemical relationship between Au, U, and Th

Geochemical investigations were carried out mainly within the Mamyn Block of the Early Precam brian continental crust together with other blocks composing the basement of the post Paleozoic Amur Plate. The Mamyn Block occurs as an arch uplift bor dering the MongolOkhotsk orogenic belt from the north and is overlain by terrigenous deposits of the Mesozoic paleobasin from the west, south, and east. Precambrian crystalline formations with carbonate terrigenous deposits are observe in the geological structure of the Mamyn Block.