4:00 PM - 4:15 PM
[ACC37-13] On the possibility of radiometric dating on the “oldest ice” using cosmogenic 26Al/10Be ratio: Insights from the Dome Fuji second deep (DF2) ice core
Cosmogenic 26Al and 10Be are produced by interactions of comic rays with specific elements in the atmosphere. Because the atmospheric production is similar between 26Al and 10Be, an exponential decrease of the 26Al/10Be ratio with time, in ordinary cases, should represents the difference of the decay constants of the nuclides (T1/2 of the 26Al/10Be ratio is 1.45 Myr). In this presentation, we show the profiles of the 26Al/10Be ratios of certain stratigraphic intervals of the Dome Fuji second deep (DF2) ice core, plotted against the latest age model for this core (Dome Fuji ice core project members, 2017). By investigating these data, we discuss about the possibility of the radiometric dating on the “oldest ice” of an age of up to 1.5 Ma.