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| DOI | 10.1016/j.quascirev.2019.03.012 |
| Impact of glacial isostatic adjustment on cosmogenic surface-exposure dating | |
| Jones R.S.; Whitehouse P.L.; Bentley M.J.; Small D.; Dalton A.S. | |
| 发表日期 | 2019 |
| ISSN | 0277-3791 |
| 起始页码 | 206 |
| 结束页码 | 212 |
| 卷号 | 212 |
| 英文摘要 | Calculating cosmogenic-nuclide surface-exposure ages is critically dependent on a knowledge of the altitude of the sample site. Changes in altitude have occurred through time as a result of glacial isostatic adjustment (GIA), potentially altering local nuclide production rates and, therefore, surface-exposure ages. Here we assess the impact of GIA on surface-exposure dating by calculating global time-dependent production rates since the Last Glacial Maximum using surface elevations that were corrected and uncorrected for GIA. We find that the magnitude of the GIA effect is spatially and temporally variable. Nuclide production could be reduced by up to 50% in the interior of large ice masses (in North America, Scandinavia and West Antarctica) at times of maximum glacial isostatic depression. Although smaller, the effect is still significant at ice sheet margins, where nuclide production is reduced by >5% and potentially >10%, making exposure ages older in those areas. Away from the ice sheet margins, land surfaces can be isostatically elevated, which can increase nuclide production by >5% and, therefore, make exposure ages younger. Areas that were more recently exposed or that are distal to large ice masses will generally be less affected. Importantly, we find that the effect at the primary 10Be production calibration sites is <1%. Applying a GIA correction to surface-exposure data may help resolve mismatches between some chronologies, but not necessarily in all regions, implying that additional factors may need to be considered. Past atmospheric changes can amplify or reduce the impact of GIA on nuclide production, and the combined effects should be fully accounted for in the future. These time-dependent influences on surface-exposure dating have potentially important implications for interpreting chronologies and for using the data to constrain ice sheet models. © 2019 The Authors |
| 英文关键词 | Atmospheric pressure; Be-10; Cosmogenic isotopes; GIA; Glaciation; Global; Nuclide production rate; Quaternary; TCN dating |
| 语种 | 英语 |
| scopus关键词 | Atmospheric pressure; Glacial geology; Glaciers; Isotopes; Cosmogenic isotopes; Glaciation; Global; Nuclide production; Quaternary; TCN dating; Ice; atmospheric pressure; beryllium isotope; chronology; dating method; glaciation; glacioisostasy; ice sheet; Last Glacial Maximum; Quaternary; Antarctica; North America; Scandinavia; West Antarctica |
| 来源期刊 | Quaternary Science Reviews
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/151958 |
| 作者单位 | Department of Geography, Durham University, South Road, Durham, United Kingdom |
| 推荐引用方式 GB/T 7714 | Jones R.S.,Whitehouse P.L.,Bentley M.J.,et al. Impact of glacial isostatic adjustment on cosmogenic surface-exposure dating[J],2019,212. |
| APA | Jones R.S.,Whitehouse P.L.,Bentley M.J.,Small D.,&Dalton A.S..(2019).Impact of glacial isostatic adjustment on cosmogenic surface-exposure dating.Quaternary Science Reviews,212. |
| MLA | Jones R.S.,et al."Impact of glacial isostatic adjustment on cosmogenic surface-exposure dating".Quaternary Science Reviews 212(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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