Cosmogenic Isotopes Datingof Quaternary Glacial Activityofthe Paleao-Daocheng Ice Cape,onthe Southeastern Partofthe Qinghai-Xizang Plateau
详细信息
- 责任者：Wang Jian(School of Geography Science ; Nanjing Normal University ; Nanjing 210046) ; Zhang Zhigang
- 刊名：Quaternary Sciences
- 出版年：2012
- 卷期：32(3)
- 页码：p.394-402
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
It is generally considered that an ice cape called Daocheng ice cape(29°02’~30°08’N,99°48’~100°30’E) must have been developed on the south eastern Qinghai-Xizang Plateau during the Quaternary epoch.However,the chronology research about its formation and activities is far from enough.In this paper,six samples were collected from near Xionggu township(29°09’N,100°11’E) of Daocheng County and dated.It is discussed that Quaternary activities of the Daocheng ice cape on its south margin,based on the exposure dating of moraines,Roche moutonnée and erratic boulders by using in situ cosmogenic isotopes Be-10 and Al-26.It is found that the Daocheng ice cape was probably developed in the period between 800~600kaB.P.and shrank afterward.Four advances of the ice cape at its south margin occurred at 287.4~162.7kaB.P.,59.6~52.5kaB.P.,27.4~25.8kaB.P.and 19.8~19.0kaB.P.,respectively.The shrinking of the ice cape since at least 0.6MaB.P.is a probable result of the drying of climate in this region.That the Daocheng ice cape at the MIS 2 is smaller,not bigger than that at the MIS 3,may be due to the fact that climate at the MIS 2 is drier than that at the MIS 3.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |