Chemical composition of tephra of sediment core GIK23059-3

Single tephra particle analysis used to compile the average composition of tephra layers of each core and Oxygen isotope stage listed in Table 2采用单颗粒火山碎屑（tephra）分析方法，对表2中所列各岩芯的火山碎屑层与氧同位素阶段（Oxygen isotope stage）的平均组成进行汇总编制。