Biogeochemical migration of Al, Hf, Sc, Th and rare-earth metals in the profile of the deep-seated eutrophic marsh in the interfluve of the Ob and Tom rivers

Aluminum, Sc, Th, Hf, and lanthanoids belong to groups of elements that are , slightly, very slightly, and moderately captured in marsh ecosystems. In the genesis of the peatbog the biogeochemical migration of elements is main ly determined by the quality of the humus barriers as well as by the capabi lity to form intermetallic compounds of widely varying compositions. In the surface layer (10 cm) of the peatbog the highest content of Al, Hf, Ce, an d Sm over the entire history of marsh development was observed. This fact r eflects the modem tendency to forming technogenic streams of the above cont ent.