关键词: 南极,普里兹湾,沉积物,元素地层,古环境

Abstract:

This paper deals with the characteristics of element geochemistry of core NP951 from the Prydz Bay,Antarctica and its implications to palaeoenvironment. The results show that the sediments in this area were greatly affected by dissipation of ice cover,gush of freshwater and terrigenous materials in the process of deposition,and the elements such as SiO 2、Al 2O 3、Fe 2O 3、CaO、MgO、P、S、C org in sediments have well recorded the changes of material source resulted by variations of palaeoclimate and the distribution patterns of these elements correspond to the palaeosedimentary environment of ocean and the variations of palaeoclimate; The climate can be roughly divided into five periods such as warm,cold,high temperature,cold tendency and warm tendency since the late Epipleistocene; The turning points of temperature,which indicated the changes of climate,occurred at 145cm(14.4ka B.P.),85cm(10.3ka B.P.) and 25cm(6.3ka B.P.) of core NP951,and the sudden change of element content at 85cm of the core where corresponds to the Gothenburg geomagnetic excursion indicated occurrence of extremely event and marks the beginning of Holocene.