Understanding erosion rates in the Himalayan orogen: A case study from the Arun Valley

Abstract Understanding the rates and pattern of erosion is a key aspect of deciphering the impacts of climate and tectonics on landscape evolution. Denudation rates derived from terrestrial cosmogenic nuclides (TCNs) are commonly used to quantify erosion and bridge tectonic (Myr) and climatic (up to several kiloyears) time scales. However, how the processes of erosion in active orogens are ultimately reflected in 10 Be TCN samples remains a topic of discussion. We investigate this problem in the Arun Valley of eastern Nepal with 34 new 10 Be‐derived catchment‐mean denudation rates. The Arun Valley is characterized by steep north‐south gradients in topography and climate. Locally, denudation rates increase northward, from <0.2 mm yr −1 to ~1.5 mm yr −1 in tributary samples, while main stem samples appear to increase downstream from ~0.2 mm yr −1 at the border with Tibet to 0.91 mm yr −1 in the foreland. Denudation rates most strongly correlate with normalized channel steepness ( R 2 = 0.67), which has been commonly interpreted to indicate tectonic activity. Significant downstream decrease of 10 Be concentration in the main stem Arun suggests that upstream sediment grains are fining to the point that they are operationally excluded from the processed sample. This results in 10 Be concentrations and denudation rates that do not uniformly represent the upstream catchment area. We observe strong impacts on 10 Be concentrations from local, nonfluvial geomorphic processes, such as glaciation and landsliding coinciding with areas of peak rainfall rates, pointing toward climatic modulation of predominantly tectonically driven denudation rates.