Cosmogenic Nuclide Burial Dating: Theoryand Application
详细信息
- 责任者：Ping Kong(Key Laboratory of the Earth’ s Deep Interior ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029)
- 刊名：Quaternary Sciences
- 出版年：2012
- 卷期：32(3)
- 页码：p.388-393
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
Cosmogenic nuclide burial dating is another isotopic dating technique developed after cosmogenic nuclide exposure age dating.This method is mainly used in dating Pliocene sediments.Cosmogenic nuclide burial dating relies on different decay constants for paired cosmogenic nuclides.The assumption behind the method is that quartz is exposed to cosmic rays on the Earth’s surface for a period of time,acquiring certain amounts of cosmogenic nuclides.The quartz is then quickly buried and decay of cosmogenic nuclides becomes the predominant process.Currently the most widely used cosmogenic nuclide pairs are 10Be and 26Al.The concentrations of cosmogenic nuclides and their ratios are functions of deposition time,so that determination of concentrations of paired cosmogenic nuclides in quartz allows quantifying the deposition age of sediments where quartz is isolated.Several factors affect the precision of the cosmogenic nuclide burial dating method,e.g.errors associated with cosmogenic nuclide concentrations,uncertainties with decay constants and surface production rate ratio of paired cosmogenic nuclides,and differences from the assumed quickly,one-time burial and steady-state erosion model.These factors have been discussed in the paper.In application of the method,we should collect samples that fit the model best.Caves,road construction,tile production and sand transport sites provide good places for samples used for burial dating.Lab experiments should prepare pure quartz where the Al concentration is low,and use Be carriers containing 10Be as less as possible.The paper also exemplifies the application of cosmogenic nuclide burial dating in understanding the formation of Xigeda sediments and the Dayi conglomerates.We can expect that the method will be widely used in China in the study of large river capture and evolution,the origin and development of early hominin,glaciations in the Early Quaternary,and other sedimentation and orogenic problems associated with the growth of the Tibetan Plateau.
© 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 |