Extended age model of sediment core GeoB18530-1 by correlation of Ca/Sr record to NGRIP chronology

The previously published 14C-AMS based chronology of GeoB18530-1 by Max et al. (2022; doi:10.1594/PANGAEA.943562), covering the upper 0 - 7.16 m core section down to Heinrich Event layer H2, was revised and extended to the full core length of 10.64 m, including now also Heinrich Event layers H3 to H6. The age model was first extended back to 34.6 ka using two older 14C AMS dates by Lars Max (doi:10.1594/PANGAEA.943562). This radiocarbon chronology now covers H1 – H3 within inferred age brackets of 15.3 to 17.3 ka (H1), 23.3 to 25.3 ka (H2) and 27.7 to 32.0 ka (H3) respectively. The ages of the older Heinrich Event layers H4 – H6 were obtained by correlating the Ca/Sr and δ18O records to the NGRIP chronology, obtaining age brackets of 37.5 to 39.9 ka (H4), 44.9 to 48.6 ka (H5) and 55.7 to 58.9 ka (H6). […]

Max 等人（2022；doi:10.1594/PANGAEA.943562）先前发表的基于 14C-AMS 的 GeoB18530-1 地层年代序列，涵盖了上层 0 - 7.16 米的核心层直至 Heinrich 事件层 H2，经修订与扩展，现已达完整核心长度 10.64 米，并纳入了 Heinrich 事件层 H3 至 H6。该年龄模型首先通过使用 Lars Max 提供的两个更古老的 14C AMS 日期，将其扩展至 34.6 ka。此放射性碳年代序列现涵盖 H1 至 H3，分别位于 15.3 至 17.3 ka（H1）、23.3 至 25.3 ka（H2）以及 27.7 至 32.0 ka（H3）的推算年龄区间内。较老层的 Heinrich 事件层 H4 至 H6 的年龄则是通过将 Ca/Sr 比例与 δ18O 记录与 NGRIP 年代序列进行相关性分析所得，其年龄区间分别为 37.5 至 39.9 ka（H4）、44.9 至 48.6 ka（H5）和 55.7 至 58.9 ka（H6）。