Geochemistry of channel drifts of the Kai River (Vietnam) and sediments of its mouth zone

Autor: V. I. Peresypkin, G. N. Baturin, N. V. Lobus, V. T. Komov
Rok vydání: 2014
Předmět:
Zdroj: Oceanology. 54:788-797
ISSN: 1531-8508
0001-4370
DOI: 10.1134/s0001437014050026
Popis: The complex lithological-geochemical investigation of the river-sea system included the analysis of the distribution of 56 elements in bottom sediments sampled along the following profile: the Kai River channel, its delta, and the shelf of the South China Sea (Vietnam). It was revealed that the sediments are generally enriched with sulfur, alkali elements (Na, Li, Rb, Ce), and ore metals (Ag, U, Bi, Mo, W) as compared with the average composition of the particulate matter in rivers and clayey rocks of continents. In each segment of this profile, the elemental composition of the sediments varies with minimum concentrations of heavy metals being confined to its end parts. The sediments are dominated by terrigenous material, which contains ore components. Despite the pollution of the seawater with industrial and domestic waste waters, the content of heavy metals in the shelf sediments never exceeds the admissible ecological values, which is probably determined by the sediment roiling by waves and bottom currents with subsequent removal of the colloid and pelitic material and its transport to the open sea. The analysis of the available data shows that a significant or the dominant part of the terrigenous material may be transported to the sea basin together with drift sediments, in addition to particulate matter.
Databáze: OpenAIRE
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