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

In: Permafrost and Periglacial Processes   ;  23 ,  2  ;  107-118  ;  2012

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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.

Table of contents – Volume 23, Issue 2

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The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

91
Origin and Flow Dynamics of Perennial Groundwater in Continuous Permafrost Terrain using Isotopes and Noble Gases: Case Study of the Fishing Branch River, Northern Yukon, Canada
Utting, Nicholas / Clark, Ian / Lauriol, Bernard / Wieser, Martin / Aeschbach‐Hertig, Werner | 2012
107
Internal Structure of a Lithalsa in the Akkol Valley, Russian Altai Mountains
Iwahana, Go / Fukui, Kotaro / Mikhailov, Nikolai / Ostanin, Oleg / Fujii, Yoshiyuki | 2012
119
The Impact of Permafrost Disturbances and Sediment Loading on the Limnological Characteristics of Two High Arctic Lakes
Dugan, Hilary A. / Lamoureux, Scott F. / Lewis, Ted / Lafrenière, Melissa J. | 2012
127
Rock Glacier Activity in the Retezat Mountains, Southern Carpathians, Romania
Vespremeanu‐Stroe, Alfred / Urdea, Petru / Popescu, Răzvan / Vasile, Mirela | 2012
138
Active Layer Characteristics At Ten Borehole Sites In Alpine Permafrost Terrain, Switzerland
Zenklusen Mutter, Evelyn / Phillips, Marcia | 2012
152
Earth Hummocks in West Dartmoor, SW England: Characteristics, Age and Origin
Killingbeck, James / Ballantyne, Colin K. | 2012
162
Soil Organic Carbon and Its Relationship to Vegetation Communities and Soil Properties in Permafrost Areas of the Central Western Qinghai‐Tibet Plateau, China
Wu, Xiaodong / Zhao, Lin / Chen, Meijun / Fang, Hongbing / Yue, Guangyang / Chen, Ji / Pang, Qiangqiang / Wang, Zhiwei / Ding, Yongjian | 2012
170
In‐Situ Observation of Cracks in Frozen Soil using Synchrotron Tomography
Bhreasail, Á. Ní / Lee, P. D. / O'Sullivan, C. / Fenton, C. H. / Hamilton, R. / Rockett, P. / Connolley, T. | 2012
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