Exposure-age and erosion rate determination using the in-situ nuclide pair 10Be-14C

Cosmogenic nuclides (CN) are widely used to determine both erosion rates E and exposure ages t of surfaces. However, in situations where both quantities are unknown, measuring a single CN at a surface is typically not sufficient to determine both t and E. We discuss the possibility of determining both t and E by measuring the CN pair, in-situ Be-10 and C-14 in quartz, at a surface. We use a previously derived Bayesian approach to derive a joint probability density for the age and erosion rate. We work through several quantitative examples to show in what ways the method may work or not work.