Be-10 Exposure Ages Obtained From Quaternary Glacial Landforms on the Tibetan Plateau and in the Surrounding Area
Be-10 Exposure Ages Obtained From Quaternary Glacial Landforms on the Tibetan Plateau and in the Surrounding Area
复制标题
青藏高原及周边地区第四纪冰川地貌Be-10暴露年龄
DOI：
10.1111/1755-6724.13554
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Xu Xiaobin
中科院分区：
文献类型：
--
作者：
Zhang Mengyuan;Mei Jing;Zhang Zhigang;Wang Jian;Xu Xiaobin
使用10Be进行的原位陆地宇宙成因核素（TCN）暴露测年是用于确定第四纪沉积物年龄的最成功的技术之一，所产生的数据能够重建青藏高原和周围山脉的第四纪冰川历史。 TCN10Be暴露年龄的统计分析，有助于重建青藏高原冰川波动的历史和过去的气候变化，以及不同地区冰川前进时间的差异。然而，不同版本的宇宙射线产生的地球核素系统学 (CRONUS-Earth) 在线计算器（用于计算和校正第四纪冰川地貌的 TCN 年龄）会产生不同的结果。为了便于建立区域间对比，本文使用CRONUS-Earth计算器2.3版重新计算了1999年至2017年发布的青藏高原184810Be暴露年龄。我们还比较了使用不同版本（2.2、2.3 和 3.0）的 CRONUS-Earth 计算器获得的 159410Be 暴露年龄的结果。结果如下。 (1) 大约97%的暴露年龄小于200ka。暴露年龄的概率密度曲线表明，全新世期间出现了更多的振荡，峰值对应于小冰期、8.2 ka和9.3 ka冷事件；主峰涵盖12至18ka期间。 (2) 在大多数地区，较新版本的计算器会产生较旧的 10Be 暴露年龄。当使用不同版本的CRONUS-Earth计算器时，大约29%的10Be暴露年龄显示出大于10ka的最大年龄差异，并且单个样本的最大年龄差异为181.1ka。
In situ terrestrial cosmogenic nuclide (TCN) exposure dating using10Be is one of the most successful techniques used to determine the ages of Quaternary deposits and yields data that enable the reconstruction of the Quaternary glacial history of the Tibetan Plateau and the surrounding mountain ranges. Statistical analysis of TCN10Be exposure ages, helps to reconstruct the history of glacial fluctuations and past climate changes on the Tibetan Plateau, differences in the timing of glacier advances among different regions. However, different versions of the Cosmic‐Ray‐prOduced NUclide Systematics on Earth (CRONUS‐Earth) online calculator, which calculates and corrects the TCN ages of Quaternary glacial landforms, yield different results. For convenience in establishing contrasts among regions, in this paper, we recalculate 184810Be exposure ages from the Tibetan Plateau that were published from 1999 to 2017 using version 2.3 of the CRONUS‐Earth calculator. We also compare the results obtained for 159410Be exposure ages using different versions (2.2, 2.3 and 3.0) of the CRONUS‐Earth calculator. The results are as follows. (1) Approximately 97% of the exposure ages are less than 200 ka. A probability density curve of the exposure ages suggests that greater numbers of oscillations emerge during the Holocene, and the peaks correspond to the Little Ice Age, the 8.2 ka and 9.3 ka cold events; the main peak covers the period between 12 and 18 ka. (2) In most areas, the newer versions of the calculator produce older10Be exposure ages. When different versions of the CRONUS‐Earth calculator are used, approximately 29% of the10Be exposure ages display maximum differences greater than 10 ka, and the maximum age difference for a single sample is 181.1 ka.