Dynamics of the Biogeochemical Composition of the Sediments from Marine Part of the Marginal Filter under the Influence of the Razdol'naya River Runoff (Amur Bay, Sea of Japan)

The contents of Si, Fe, Mn, K, P, V, Cr, Co, Ni, Pb, Cu, Zn, Cd, As, Sn, Mo, Li, Rb, Cs, Sc, Ga, Y, Hf, Ta, Nb, Th, U, C-org, and clay minerals (HM, CHL, SM) were analyzed in the subcolloid fraction of bottom sediments (BS) from the marine part of the Razdol'naya River marginal filter, which were sampled during average annual (2014) and elevated (typhoon, 2015) river runoff. It was revealed that suspended particulate matter feeding Amur Bay comes from the river with the high contents of HS (after the typhoon) and from Uglovoi Bay with high SM (average annual river runoff). The typhoon provides two times higher HM influx in the bay compared to that of the average annual river runoff. An increase of element contents is related to the sorption on clay minerals (HM, SM) and newly formed Fe, Mn oxyhydroxides (heavy metals, HM. As well as U and Th), as well as to the accumulation by marine phyto- and zooplankton (Mo, As, P).