Sedimentological data of permafrost cores from Barentburg area

The geochronology was established on the basis of Accelerator Mass Spectrometry (AMS) radiocarbon dates using a Mini Carbon Dating System (MICADAS) implemented at Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI). Further preparation for AMS radiocarbon dating bulk samples were carried out by the Laboratory of Radiocarbon dating and electron microscopy of the Institute of Geography of the Russian Academy of Sciences. Their radiocarbon ages were measured by accelerated mass spectrometry (AMS) at the Center for Applied Isotope Studies of the University of Georgia (USA) using the 1.5SDH Pelletron AMS. Sediments were freeze-dried manually homogenized, and split into sub-samples for further analyses: grain-size distribution, mass-specific magnetic susceptibility, total elemental carbon (TC) and nitrogen contents (TN), total organic carbon content (TOC), the δ¹³C of TOC. The total inorganic carbon (TIC) content was calculated by subtracting TOC from TC. For TOC and δ¹³C analyses, samples were decalcified for 3 h at 95°C by adding 1.3 N HCl.

本年代学框架依托加速器质谱（Accelerator Mass Spectrometry, AMS）放射性碳测年数据建立，测年所用的微型碳测年系统（Mini Carbon Dating System, MICADAS）部署于德国阿尔弗雷德·魏格纳亥姆霍兹极地与海洋研究中心（Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, AWI）。用于AMS放射性碳测年的批量样品前处理工作由俄罗斯科学院地理研究所放射性碳测年与电子显微镜实验室完成。样品的放射性碳年龄由美国佐治亚大学应用同位素研究中心采用1.5SDH型Pelletron加速器质谱仪通过加速器质谱法测定。沉积物经冷冻干燥后进行手工均质化处理，并被拆分为多个子样以开展后续分析：粒度分布、质量比磁化率、总碳（TC）与总氮（TN）含量、总有机碳（TOC）含量以及总有机碳的碳同位素δ¹³C值。总无机碳（TIC）含量通过总碳减去总有机碳计算得到。针对总有机碳与δ¹³C分析的样品，需在95℃条件下用1.3N盐酸脱钙处理3小时。