南极15ka以来海洋沉积物的环境磁学研究

通过对东南极普里兹湾陆坡区ＮＰ９５－１及西南极长城湾ＮＧ９３－１两柱样系统的环境磁学研究，获得了南极地区１５．０～５．５ｋａＢ．Ｐ．以来的古气候变化序列。结果表明，磁学参数较好地记录了古气候变化及沉积环境变化的信息。ＮＰ９５－１柱样较好地记录了Ｈｅｉｎｒｉｃｈ１事件、新仙女木事件以及波令－阿罗德暖期，其中Ｈｅｉｎｒｉｃｈ１事件发生于１４．３ｋａＢ．Ｐ．，新仙女木冷期为１１．７～１０．３ｋａＢ．Ｐ．，１０．３ｋａＢ．Ｐ．以后，南极地区进入全新世。在全新世，两柱样记录了在１０．０ｋａＢ．Ｐ．及６．０ｋａＢ．Ｐ．前后两个暖期，其间夹有小幅气温下调的时段；６．０ｋａＢ．Ｐ．后，两柱样均有气候颤动变冷的记录。

ENVIRONMENTAL MAGNETISM OF MARINE SEDIMENTS FROM ANTARCTICA SINCE 15kaB.P.

In this paper, environmental magnetism of two marine sediment cores NP95 1 and NG93 1 is systematically studied ( core NP95 1 was collected from Prydz Bay,Eastern Antarctica, and core NG93 1 was sampled from Great Wall Bay, Western Antarctica), and a series of paleoclimatic variations is obtained.Results show that the rock magnetic parameters well correspond to the paleoclimatic variations and sedimentary environmental changes. The NP95 1 well recorded the Heinrich event 1, Younger Dryas cold event and Bolling Allerod warm period, and the Heinrich event 1 occurred at 14.3kaB.P., Younger Dryas occurred at 11.7～10.3kaB.P..The boundary of Pleistocene and Holocene in Antarctica is 10.3 kaB.P.. In Holocene,two warm periods were recorded at about 10kaB.P. and 6.0kaB.P. with a little colder period between them. After 6.0kaB.P., two cores both recorded a cold climatic oscillation.