Extended age model of sediment core GeoB18530-1 by correlation of δ18O 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 d18O 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年；doi:10.1594/PANGAEA.943562）先前发表的基于14C-AMS的GeoB18530-1样本的年代序列，覆盖了从0至7.16米的上层核心部分，直至 Heinrich 事件层H2，经过修订与扩展，现已涵盖整个10.64米的核长，其中包括了 Heinrich 事件层H3至H6。该年龄模型首次通过Lars Max（doi:10.1594/PANGAEA.943562）提供的两个较旧的14C AMS日期，追溯至34.6千年前。此放射性碳年代序列现涵盖H1至H3，分别位于15.3至17.3千年前（H1）、23.3至25.3千年前（H2）及27.7至32.0千年前（H3）的推定年龄区间内。较老期的 Heinrich 事件层H4至H6的年龄，则是通过将Ca/Sr比和δ18O记录与NGRIP年代序列进行相关性分析而获得的，其年龄区间分别为37.5至39.9千年前（H4）、44.9至48.6千年前（H5）以及55.7至58.9千年前（H6）。