| 稻城冰帽冰碛物光释光测年研究中遇到的问题及探讨 |
| |
| 引用本文： | 张志刚,王建,赖忠平,徐孝彬,白世彪,张茂恒.稻城冰帽冰碛物光释光测年研究中遇到的问题及探讨[J].地质学报,2012,86(4):602-610. |
| |
| 作者姓名： | 张志刚 王建 赖忠平 徐孝彬 白世彪 张茂恒 |
| |
| 作者单位： | 南京师范大学地理科学学院,南京师范大学地理科学学院,中国科学院青海盐湖研究所,江苏教育学院,南京师范大学地理科学学院,南京师范大学地理科学学院 |
| |
| 基金项目： | 国家自然科学基金项目（面上项目）,中国科学院百人计划项目,江苏省优势学科项目 |
| |
| 摘 要： | 冰川事件是气候波动最直接的地质证据,利用冰川作用过程中形成的冰碛物的年代数据建立冰川事件的时间顺序,是反演冰川演化历史以及区域古气候和古环境的有效途径。然而,由于冰川沉积环境的复杂性,很大程度限制了冰川年代数据的获取。近年来,随着光释光测年技术的不断完善,其应用范围已经扩展到冰川沉积物的年代测定。本文利用光释光(OSL)测年技术对青藏高原东南部稻城冰帽库照日地区系列冰碛垄进行年代测定,试图建立库照日地区冰川事件的年代序列。然而,光释光(OSL)年代结果与先前发表的ESR和宇生核素10Be暴露年代数据不一致,且个别数据与地貌新老关系不符。通过对比分析显示:冰碛物样品埋藏前释光信号的部分晒退以及样品提取的石英不纯,可能导致冰碛物光释光测年的较大误差和不准确性,应该引起足够的注意。
|
| 关 键 词： | 稻城冰帽 库照日 光释光测年 冰川 冰碛物 非正常衰减 |
| 收稿时间： | 2011/11/9 0:00:00 |
| 修稿时间： | 2012/1/13 0:00:00 |
Problems and Analyses of Optically Stimulated Luminescence Studies of Glacial Deposits from Daocheng Ice Cap,Sichuan,China |
| |
| Zhangzhigang,Wangjian,Laizhongping,Xuxiaobin,Baishibiao and Zhaomaoheng.Problems and Analyses of Optically Stimulated Luminescence Studies of Glacial Deposits from Daocheng Ice Cap,Sichuan,China[J].Acta Geologica Sinica,2012,86(4):602-610. |
| |
| Authors: | Zhangzhigang Wangjian Laizhongping Xuxiaobin Baishibiao and Zhaomaoheng |
| |
| Institution: | School of Geography Science of Nanjing Normal University,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Jiangsu college of Education,School of Geography Science of Nanjing Normal University,School of Geography Science of Nanjing Normal University |
| |
| Abstract: | Glacier Change is a good indicator for climatic changes. To date the Quaternary moraine sequencese can reconstruct the history of the glacial changes. In the recent years, the Optically Stimulated Luminescence (OSL) dating method has been widely used in the dating of glacial sediments. In this study, we try to use the OSL method to date the moraine sequencese on the southern magin of the paleao Ice Cap of Daocheng, Sichuan,China. However, the OSL ages were out of accord with previously reported Electron Spin Resonance (ESR) ages and 10Be exposure ages from glacial deposits in the same location. In addition, some of the OSL dates did not agree with the relative geomorphologic and stratigraphic relationship of the moraines. This suggests that Partial bleaching prior to burial and the bad purity of the quartz maybe result in the uncorrectness of the dating results. |
| |
| Keywords: | Daocheng Ice Cap Kuzhaori OSL glacier deposits anomalous fading |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质学报》浏览原始摘要信息 |
| 点击此处可从《地质学报》下载免费的PDF全文 |
|
