CHARACTERISTICS OF THE ACTIVE LAYERS ON FILDES PENINSULA OF KING GEORGE ISLAND, ANTARCTICA |
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Abstract: | From the data of the pitting, geoelectrical prospecting, temperature measurement, salt content analysis and detection by layering frost-heaving instruments, the authors discuss firstly the structural features of sediments in the active layers in this region, and proves the presence of the bowl-shaped frost table in the stone-circles area, and then analyse the regulatities of temperature distribution in the active layer, effect of salt content on electric resistivity, thaw-settlement and frost-heaving, and their control on periglacial land-form development. It suggests that the five layers should exist in the subsurface structure , namely, active layer, frost sand and gravel layer, frost volcanic rock permeated by sea water, frost volcanic rock unperme-ated by sea water, and unfrost ancient continental basement. Finally, the permafrost table and its vertical gradient are deduced. |
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