In recent research the Holocene ice wedges exposed in the outcrop of the first marine terrace near Anadyr in the east of the Chukchi Peninsula have been investigated. The first marine terrace has polygonal relief, the size of the polygons is about 8x12 m. The enclosing sediments are represented with peat of about 1.5 m thick, underlaid with sandy loam up to 2 m thick; and horizontally-layered sand below. Vertically layered, yellowish gray ice of the ice wedges is located in peat and in the underlying sandy loam. 20 ice samples were collected from Holocene ice wedges, as well as ice from modern ice veinlet and water from The Onemen Bay. It was found that mineralization of the studied Holocene ice wedges is low, does not exceed 80 mg/L, Na+, Ca2+, and Cl- dominates. Similar values of mineralization and ionic composition were obtained for the modern ice veinlet. The obtained data close fit with ice wedges data obtained in other regions of Chukotka, both continental and coastal. Mineralization of most of the previously studied ice wedges did not exceed 150 mg/L. Low values of mineralization of ice wedges near Anadyr demonstrate mainly meteoric source of water forming the ice.

The chemical composition of water-soluble salts in ice wedges has been determined on an ion chromatograph "Stayer" by the method of ion chromatography in the laboratory of the Ecological and Geochemical Scientific and Educational Center at the Department of Geochemistry of Landscapes and Geography of Soils, Faculty of Geography, Lomonosov Moscow State University. The limit of detection for chloride ion was 0.02 mg/L.The research was financially supported by the Russian Scientific Foundation (grant nr 19-17-00126, field studies and isotope analysis) and Russian Foundation for Basic Research (grant nr 18-05-60272, methodology of the study and calculations)