Major oxide geochemical compositions of glass shards from disseminated tephras in sediment core PC063; Tab 4.1

All iron calculated as FeO. Probe conditions: accelerating voltage 20kV, beam current 15nA, 1µm focused beam, 10 second count times

所有铁均按FeO进行计算。探针条件：加速电压20kV，束流15nA，1µm聚焦束，计数时间为10秒。