Stable oxygen and carbon isotope ratios of Neogloboquadrina pachyderma from Latest Pleistocene to Holocene sediments of the eastern central Arctic Ocean@en

A high-resolution study including oxygen and carbon stable isotopes as well as carbonate and total organic carbon contents, has been performed on undisturbed near-surface (0-40 cm) sediment sequences taken in the eastern Arctic Ocean during the international Arctic 91 Expedition. Based on the oxygen stable isotope records measured on Neogloboquadrina pachyderma (sin.) and AMS 14C dating, the upper 10 to 20 cm of the sediment sequences represent isotope stage 1, and the base of Termination I (15.7 ka) can be identified very well. Stage 1 sedimentation rates vary between 0.4 and >2.0 cm/kyr. In general, glacial stage 2 sedimentation rates are probably lower and vary between 0.4 and 0.7 cm/kyr. […]本研究针对国际北极91科考航次（International Arctic 91 Expedition）在北极东部海域采集的未扰动近地表（0~40厘米）沉积序列开展了高分辨率分析，测试内容涵盖氧、碳稳定同位素（stable isotope）、碳酸盐与总有机碳（total organic carbon）含量。基于对厚壁新方球虫（左旋型，Neogloboquadrina pachyderma (sin.)）的氧稳定同位素记录与加速器质谱碳十四测年（AMS 14C dating）结果，该沉积序列的上部10~20厘米对应同位素阶段1（isotope stage 1），且可清晰识别终止带Ⅰ（Termination I）的基底（对应年龄为15.7千年）。阶段1的沉积速率介于0.4~>2.0厘米/千年。总体而言，冰期阶段2的沉积速率可能更低，介于0.4~0.7厘米/千年。[…]