Chemical composition of tephra of sediment core PS1857-2

Single tephra particle analysis used to compile the average composition of tephra layers of each core and O-stage listed in Table 2本数据集通过单火山碎屑（tephra）颗粒分析方法，整合得到表2中所列各岩芯（core）与O阶（O-stage）对应的火山碎屑层的平均组分。