Exposure dating of underwater rocks: potential application to studies of land bridges during the Ice Ages

摘要

~(10)Be concentrations for four underwater rock samples from the Tsugaru Strait, Japan were obtained. Most of the ~(10)Be concentrations of these samples are higher than the expected steady state concentration at the relevant underground depth, implying that most samples have been pre-exposed during the last ice age. The model calculation of ~(10)Be production using recent rates for underground production and parameters of sea level change, uplift rate and erosion rate of this study could be an essential tool for exposure dating applications for both underwater and marine terrace samples.