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(Article of periodic en Anglais - 2012)

Document title

Internal structure of a lithalsa in the Akkol Valley, Russian Altai Mountains

Authors(s) and Affiliation(s)

IWAHANA G. (1) ; FUKUI K. (2) ; MIKHAILOV N. (3) ; OSTANIN O. (3) ; FUJII Y. (4) ;
(1) Hokkaido Univ., Sapporo, JAPON
(2) Caldera Sabo Museum, Tateyama, JAPON
(3) Dep. of Geography, Altai State Univ., Barnaul, RUSSIE, FEDERATION DE
(4) National Inst. of Polar Research, Tokyo, JAPON

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. The AA. 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

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2012, vol. 23, no2 [pp. 107-118]

Bibliographic references : 43 ref.

Collation : 1 tabl., 14 fig.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1734

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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