宇宙線生成核種^<10>Beおよび^<26>Alのプロセス地形学的応用

概要

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This paper overviews methodology of in situ-produced cosmogenic ^<10>Be and ^<26>Al studies for quantifying diverse geomorphic processes. The use of this method offers a powerful tool to understand Earth surface processes and landform development in a long (10^3-10^6 yr) timescale. We introduce production mechanisms and advantages of the nuclides within terrestrial quartz, formulations in analytical modeling, and several techniques for application. The nuclide analysis provides not only the minimum exposure age or maximum erosion rate of a single rock surface, but rates of soil production on a hillslope, spatially-averaged erosion rates of a drainage basin, and speeds of sediment transport through a piedmont. Depth profiling of nuclide concentrations helps with establishing geological site-history including timings of exposure or burial events and also rates of surface denudation or sedimentation. The techniques have a potential for quantitative testing of long-standing geomorphic models and evaluating landscape responses to tectonic, climatic and anthropogenic forcing.
日本地形学連合の論文
2007-04-25