Abstract
The complex study of the river water and pore solutions from the bottom sediments in the lower reaches of the Razdol’naya River was conducted in February 2010. The major ion composition of the waters indicates the submarine origin of the near-bottom and pore waters in the lower reaches of the Razdol’naya River in the winter. The river estuary extends upstream for more than 20 km. It was established that the studied sediments are reduced oozes containing pyrite, hydrotroilite, and iron monosulfide, which is direct evidence for sulfate-reduction in the sediments. The diagenesis of organic matter is the main reason for the considerable decrease in the amount of sulfates and the increase in the alkalinity of the sediment pore water. The sedimentary pore water sampled from the deep river pits is characterized by excess alkalinity that cannot be explained by sulfate-reduction and methane genesis. It was suggested that the chemical weathering of silicate minerals and the bacterial mineralization of salts of organic acids could result in the excess alkalinity of the sediment pore water.
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Original Russian Text © G.Yu. Pavlova, P.Ya. Tishchenko, N.D. Khodorenko, M.G. Shvetsova, S.G. Sagalaev, 2012, published in Tikhookeanskaya Geologiya, 2012, Vol. 31, No. 3, pp. 69–80.
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Pavlova, G.Y., Tishchenko, P.Y., Khodorenko, N.D. et al. Major ion composition and carbonate equilibrium in the sediment pore water of the Razdol’naya River estuary of Amur Bay, the Sea of Japan. Russ. J. of Pac. Geol. 6, 251–262 (2012). https://doi.org/10.1134/S1819714012030049
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DOI: https://doi.org/10.1134/S1819714012030049