关键词: 南极;古海蚀龛沉积;古环境

Abstract:

It is the first time that the palaeogoe sediments kept in good condition were discovered on the Great Wall area,which is located in the Fildes Peninsula,west Antarctic. According to the research on the surface textures of the quartz grains, the grain size features of the sediments and elemental geochemistry such as the ratios of Sr/Ba and B/Ga,we can conclude that the palaeogoe sediments deposit under glaciofluvial lacustrin sedimental environment, and the sedimental environment records the history of the gemorphy evolution ,ice sheet advance and recession and palaeoclimate variability of this area dated from 4600 aBP. The discovery of the palaeogoe sediments is very significant for the palaeoenvironment study on the ice-free area of the Antarctic, because the sediment sections offer a new carrier recording the palaeoenvironment information,except for lake sediments,ocean sediments ,ice core and loess.