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Long-term denudation rates of actively uplifting hillcrests in the Boso Peninsula, Japan, estimated from depth profiling of in situ-produced cosmogenic Be and Al
Authors:Yuki Matsushi  Sachi Wakasa  Hiroyuki Matsuzaki  Yukinori Matsukura
Institution:aGeoenvironmental Sciences, Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;bDepartment of Nuclear Engineering and Management, The University of Tokyo, Tokyo 113-0032, Japan
Abstract:Depth profiling of in situ-produced cosmogenic 10Be and 26Al was applied to estimate the rate of long-term denudation on actively uplifting hillcrests made of weakly consolidated sandstone in the Boso Peninsula, Japan. The nuclide concentration in the topmost meter of the hillcrest has reached an equilibrium value owing to surface denudation at 90 mm/kyr. This rate is much smaller than the regional uplift rate, and is consistent with the current isolated residual topography of the hillcrest. By considering the epoch of emergence of the sandstone hillcrests, we estimate the summit denudation rate of the adjacent mudstone hill formation to be 720 ± 110 mm/kyr.
Keywords:Cosmogenic nuclides (10Be and 26Al)  Depth profile  Denudation rate  Hillcrest  Landscape evolution
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