Arctic and AntarcticaReference:
Types of cyclicality of the yedoma strata in the Mayn River valley (Chukotka)
Abstract.The subject of the study is the cyclicality of the yedoma strata in the Mayn River valley of Southern Chukotka. The author explores the Late Pleistocene syngenetic strata containing syngenetic ice wedges in the Mayn River valley of Southern Chukotka: lacustrine and lacustrine-alluvial sediments in the Ledovy exposure outcrop, and lacustrine-alluvial sediments of the Ust’-Algan exposure. These strata are located close to each other, and formed with the diverse in lithological composition and facies sendiments: from coarse sand with pebble of river facies to silty facies, permeated with thick ice wedges of different configurations. The main research method is the field study of cryolithological structure of the natural exposures. The author also examines the radiocarbon age of the strata of the wedges, the oxygen-isotope and hydrochemical composition of ice wedges. The following conclusions were made:1. The hierarchy of the main types of cyclicity, observed in the studied syncryogenic strata is clarified;2. The duration of micro-, meso- and macro-cycles in formation of the yedoma strata of the Main River valley is determined- cyclite polygonal ice wedges in the section of lacustrine strata of the Ledovy exposure- heterocyclic polygonal ice wedges of in the section of lacustrine-alluvial yedoma of Ledovy exposure- heterocyclitic polygonal ice wedges in the section of Ust’-Algan exposure.
Keywords: cyclicality, oxygen isotopes, radiocarbon, yedoma, ice wedge, permafrost, Mayn River, Late Pleistocene, syngenetic, palaeogeocryology
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