Isotopic and geochemical features of the Late Cretaceous and Cenozoic flysch complexes of Kamchatka and southern Koryakia
Isotopic and geochemical investigations of Late Cretaceous - Cenozoic flysch thicknesses of Kamchatka and Koryakia show that the thicknesses resulted from at least two sources - depleted and enriched. The enriched source is, evidently, the ancient upper continental crust. The suprasubduction and oceanic complexes can be the depleted source. The enriched rocks predominate in pre-collision flysch thicknesses; and the depleted rocks, in post-collision flysch thicknesses.