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Arctic and Antarctica

Yedomas in Alaska and Klondike with well-defined cyclic qualities
Vasil'chuk Yurii Kirillovich

Doctor of Geology and Mineralogy

Professor, the department of Geochemistry of Landscapes and Soil Geography, Lomonosov Moscow State University

119991, Russia, Moscow, ul. Leninskie Gory, 1, of. 2009
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The object of this research is the yedomas in Alaska and Klondike with the well-defined cyclic qualities. The author examines the mesocyclic polygonal-lode complex McLeod Point, mesocyclic polygonal-lode complex  on the Itkillik River, mesocyclic polygonal-lode complex in Chatanika, mesocyclic polygonal-lode complex  in the Last Chance Creek valley, mesocyclic polygonal-lode complex in the Fox permafrost tunnel, mesocyclites in the Seward Peninsula, Colville River valley, the northern slope of Alaska, and Klondike near Dawson City. The main research method contains the analysis of cryolithological structure, radiocarbon dating, oxygen-isotope and hydrogen-isotope data. The main result of the conducted research lies in identification of mesocyclites in the Alaska and Klondike yedomas, such as: a) there are three vertical growth mesocyclitic stages in the MacLeod Point yedoma; b) four vertical growth mesocyclitic stages are common in the Chatanika yedoma; c) at least four vertical growth mesocyclitic stages are identified in the Itkillik yedoma; d) at least four vertical growth mesocyclitic stages are revealed in the Fox permafrost yedoma; e) at least four vertical growth mesocyclitic stages are tiers are distinguished in the Last Chance Creek valley; f) large, two or more layered syngenetic lodes are detected in the Seward Peninsula, Colville River valley , and the northern slope of Alaska yedomas – two-layered lodes; g) Klondike yedoma, near the Dawson City, is characterized with powerful two-three layered syngenetic lodes.

Keywords: deuterium, oxygen isotopes, radiocarbon, yedoma, ice wedge, permafrost, Late Pleistocene, syngenetic, cyclicality, Alaska and Yukon



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