Fluctuation of Antarctic Ice Sheet and environmental change during the late Quaternary

1.关于在Lutzow-Holm湾地区从原位化石aragonitic shell中生长的海滩的ESR日期的调查，以比较ESR年龄与^<14>C日期，并讨论晚期Pleistocene chronology。从ESR时代，到^<14>C时代（33 - 43卡）似乎已被估计，并将在很大程度上接近海洋同位素阶段（MIS） 4-5或MIS 6-7，甚至更接近MIS 3.2。氨基酸chronology也被应用于分子壳的相同样本。氨基酸的范围从212卡到414卡，如果他们已经经历了-10-C的恒定条件。这些年龄是^<14>C年龄、ESR年龄和氨基酸年龄中最古老的年龄。3. Glacial erratics作为从Mt. Riiser-Larsen收集的Cosmogenic Radio Nuclides （CRN）日期中收集的基岩样本。CRN约会的结果大约是50卡，这与沿海网站上的TL和放射性碳年龄结果一致。从290米处恢复的最低玻璃误差显示24岁的最低CRN年龄，指示该区域冰纸最终融化的时间。在Mt. Riiser-Larsen表示，在冰表最近最新一集扩展的最大高度， EAIS在这一地区经历了2次不同的事件，从50卡到大屠杀。

1.The investigate on ESR dating of in situ fossil aragonitic shells from raised beaches in the Lutzow-Holm Bay region to compare ESR ages with ^<14>C dates and to discuss on late Pleistocene chronology. From the ESR ages, the ^<14>C ages (33 -43 ka) seem to be underestimated and to be much closer to the marine isotope stage (MIS) 4-5 or MIS 6-7 rather than to MIS 3.2.Amino acid chronology was applied also for the same samples of molluscan shell. Amino acid ages range from 212 ka to 414 ka, if they have been experienced constant condition of -10ーC. These ages are the oldest age among ^<14>C age, ESR age and amino acid age.3.Glacial erratics as well as bedrock samples from Mt.Riiser-Larsen were collected for Cosmogenic Radio Nuclides (CRN) dating. The results of the CRN dating are approximately 50ka that is consistent with the TL and radiocarbon age results from the lake sediments in the coastal site. The lowest glacial erratics recovered from 290m in altitude show the minimum CRN age of 24ka indicating the timing of the final melting of the ice sheet in this area. Given that the trimline at the Mt.Riiser-Larsen indicates the maximum height of the most recent episode of expansion of the ice sheet, EAIS in this area experienced 2 distinct events of retreat since about 50ka to the Holocene.