Sedimentation in an intermountain lake, Lake Okotanpe, Hokkaido. II Sedimentation rate and its sedimentary processes introduced from the 1977 Usu volcanic ash layer of sediment core.

Chikita, Kazuhisa A.

doi:10.3739/rikusui.47.355

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…The increase in the proportion of finer soil particles and the rate of sedimentation with increasing depth (Table ; Figures and ) demonstrate a progressive shallowing of the lake in which the studied lithalsa would form, because finer soil particles are transported further from a fluvial inlet into water reservoirs, and the sedimentation rate is greater closer to the inlet point (e.g. Cockburn and Lamoureux, ; Chikita, ). As the pond became shallower, the winter seasonal frost began to penetrate into the bottom sediments, allowing ice segregation and eventually creating a perennial frost mound.…”

Section: Discussionmentioning

confidence: 99%

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

Iwahana

Fukui

Mikhailov

et al. 2012

Permafrost & Periglacial

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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.

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Section: Discussionmentioning

confidence: 99%