Peculiarities of the rare-earth element distribution in the modern bottom sediments of the White Sea and the lower reaches of the Severnaya Dvina River

Distribution of Elements in Iron-Manganese Formations in Bottom Sediments of Lake Onego (NW Russia) and Small Lakes (Shotozero and Surgubskoe) of Adjacent Territories

“…With La N /Yb N > 8 (and according to a steep slope of the spectrum), one can conclude that acid igneous formations predominate in the studied region. High (≥20) La N /Yb N ratios indicate dominance in the paleowater catchment areas of granitoids [45][46][47]. The steep slope of the REE spectrum, high La N /Yb N ratios, and the presence of a negative Eu anomaly are typical for the FMC of the Petrozavodsk bay of Lakes Onego and Surgubskoe.…”

“…During chemical composition analysis of FM nodules and crusts from these lakes, the constant presence of Ba and Fe in signifficant amounts in manganese zones was revealed, along with the presence of Mn and P impurities in the granular zones. The chemical composition of FM nodules from Lake Surgubskoe is as follows: granular zones (%): Fe (24-67), Mn (0-21), Ва (0-0.5), O (28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42), Р (0.5-2), and total (44-100); manganese zones (%): Fe (1-35), Mn (38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52), Ва (4-12), O , Р (0-1), and total (55-99).…”