Problems and Analyses of Optically Stimulated Luminescence Studies of Glacial Deposits from Daocheng Ice Cap ,Sichuan , China
详细信息
- 责任者：Zhang Zhigang (School of Geography Science ; Nanjing Normal University ; Nanjing 210046 ; China) ; Wang Jian
- 刊名：Acta Geologica Sinica
- 出版年：2012
- 卷期：86(4)
- 关键词：冰碛物 ; till ; 光释光测年 ; optical stimulated luminescence dating ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.602-610
- 图表：4 illus., 2 tables, 50 refs.
- 分类号：1400
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Glacier events are a direct geological indicator for climatic changes.Time sequence established using dating data of ice-borne sediments formed during glaciation process is an effective mean to inverse history of the glacial changes and regional paleoclimate and paleoenviroment.But complicated glacial deposition environment limits acquisition of glacial time to a large extent.In the recent years,with the development of Optically Stimulated Luminescence(OSL) dating method,it has been widely used in dating of glacial sediments.This study employed the OSL method to date the moraine sequences on the southern margin of the ancient ice-cap of Daocheng,Sichuan so as to establish time sequence of glacial events occurring in the Kuzhaori area.However,the OSL ages were not in accordance with previously reported ESR ages(Electron Spin Resonance) and 10Be exposure ages;in addition,some of the OSL dates do not agree with the relative geomorphologic and stratigraphic relationship of the moraines.The comparative study suggests that partial bleaching prior to burial and poor purity of the quartz may result in inaccuracy of the dating results,and enough attention should be paid on this issue.
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