Modern sedimentation in lakes Chukcha and Bezymyanka, Okhotsk coast

Abstract

Lakes Chukcha (59°31’56” N; 147° 23’07” E) and Bezymyanka (59°29’56” N; 147°21’02” E) located in the Kava-Taui depression, in the norther cost of Sea of Okhotsk. The thickness of the sediments, rock magnetic properties, sedimentation rates in both lakes are different. The surface bottom sediments of Chukcha lake are heterogeneous in grain composition. The rock magnetic properties of surface sediments are controlled by the grain size. The shallow water sandy sediments show the low of MS, Jrs, Js, and high values of Jp while silt have opposite characteristics. Magnetic minerals from silt are single domain with low content of paramagnetic component. The magnetic properties of fine-grained sediments may be associated with the authigenic (hemogenic) iron sulfides and oxides.