GEOCHEMICAL VARIABILITY OF TERRIGENOUS BOTTOM SEDIMENTS IN THE WESTERN KARA SEA
Abstract
The main component of theKaraSeabottom sediments is terrigenous material from the huge catchment area of the largest Siberian rivers Ob’ andYenisei. The rivers carry this material mainly in suspended and colloidal forms; its further precipitation occurs on geochemical barriers «river-sea». The territory located westward from theYamalPeninsularepresents the part of theKaraSeathat is beyond the main direction of river flows. Here coastal abrasion of the continent and Novaya Zemlya Archipelago plays the major role in accumulation of bottom sediments. This work is devoted to the identification and grouping of diverse bottom sediments of the westernKaraSeaaccording to their geochemical characteristics. Terrigenous material of the Ob’ or mixed Ob’-Yeniseigeochemical type was found to predominate in the composition of bottom sediments. The wide areal distribution of this material likely results from the migration of the lenses of freshened water from the Ob’ andYeniseiestuaries above the saline seawater and precipitation of suspended terrigenous material on the lateral saline geochemical barrier. The areas where material of different origin is accumulated, particularly, supplied by coastal abrasion, are traced by elevated or reduced content of certain elements relative to the Ob’-Yeniseigeochemical background. These territories have limited areal extent.
Keywords
Kara Sea,
bottom sediments,
Ob’ and Yenisei river drift,
terrigenous matter,
geochemical barriers,
informative chemical elements,
geochemical identification
Supporting agencies: Russian Science Foundation (project N 14-17-00764)
About the Authors
En. E. Asadulin
Institute of Ore Deposits, Minerаlogy, Petrography and Geochemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
Laboratory of Radiogeology and Radiogeoecology,
Senior Research Scientist, PhD in Geology and Mineralogy
A. Yu. Miroshnikov
Institute of Ore Deposits, Minerаlogy, Petrography and Geochemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
Laboratory of Radiogeology and Radiogeoecology,
Senior Research Scientist, PhD in Geology and Mineralogy
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Review
For citations:
Asadulin E.E., Miroshnikov A.Yu. GEOCHEMICAL VARIABILITY OF TERRIGENOUS BOTTOM SEDIMENTS IN THE WESTERN KARA SEA. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2016;(3):98-105. (In Russ.)
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