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Internal Structure of a Lithalsa in the Akkol Valley, Russian Altai Mountains

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  • Go Iwahana
  • Kotaro Fukui
  • Nikolai Mikhailov
  • Oleg Ostanin
  • Yoshiyuki Fujii

Abstract

Perennial frost mounds are present near the edges of ponds located on the terrace between the mountain flank and a valley‐bottom lake in the Akkol valley of the Russian Altai Mountains. These mounds are 10–50 m in diameter and 3–6 m in height. We describe one mound, identified as a lithalsa, which had been eroded so as to expose almost its entire vertical cross‐section, revealing its internal structure. The frozen core consisted mainly of soil segments suspended in reticulate ice lenses with a mean thickness of 11–48 mm and a maximum thickness of about 160 mm. The shapes of the soil segments matched their neighbours. Other features included soil segments suspended in the ice veins shaped like ‘En echelon gash veins’, and the presence of a radial structure of ice‐rich and sediment‐rich frozen bands. These features all suggest the greater importance of a differential stress field during heaving of the mound and after ice segregation, compared to the thermal gradient and water supply. Copyright © 2012 John Wiley & Sons, Ltd.

Suggested Citation

  • Go Iwahana & Kotaro Fukui & Nikolai Mikhailov & Oleg Ostanin & Yoshiyuki Fujii, 2012. "Internal Structure of a Lithalsa in the Akkol Valley, Russian Altai Mountains," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 23(2), pages 107-118, April.
    • Handle: RePEc:wly:perpro:v:23:y:2012:i:2:p:107-118
    DOI: 10.1002/ppp.1734
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    Cited by:

    1. Go Iwahana & Robert C. Busey & Kazuyuki Saito, 2020. "Seasonal and Interannual Ground-Surface Displacement in Intact and Disturbed Tundra along the Dalton Highway on the North Slope, Alaska," Land, MDPI, vol. 10(1), pages 1-18, December.
    2. Adrian Emmert & Christof Kneisel, 2021. "Internal structure and palsa development at Orravatnsrústir Palsa Site (Central Iceland), investigated by means of integrated resistivity and ground‐penetrating radar methods," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 32(3), pages 503-519, July.

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