Understanding sediment transport using pIRIR signal from feldspar single grain supported by terrestrial cosmogenic radionuclides.

Understanding sediment movement over time and space requires quantitative tools. The trapped charge phenomenon or luminescence properties of sand grains are one of the potential techniques in sediment tracing [4]. Luminescence of sand grains builds up during burial in sedimentary deposits and resets at the Earth's surface when exposed to sunlight. This sensitivity to daylight exposure can be utilized to quantify Earth's surface processes such as sediment transport and or soil mixing. Thus, the variations in the magnitude of the luminescence signal, raise the possibility of quantifying rates of Earth surface processes via measurements of the luminescence signal. In this study, we aim to investigate the luminescence signature of hillslope denudation by measuring the percentage of bleached versus non-bleached (saturated) grains in associated modern fluvial deposits for a large variety of source catchments (in Chile and New Zealand) with contrasting morphometric properties. We will utilize feldspar single-grain pIRIR measurement protocols to measure the luminescence signature and perform the data analyses previously described in [5]. Our research will offer innovative constraints on weathering intensity and hillslope denudation and how they are related to the denudation rates of the selected catchments. We will thus use paired in situ 14C and 10Be terrestrial cosmogenic nuclides (TCN) measurements for some selected catchments in the Southern Alps of New Zealand and Chile (both with pronounced climatic gradients), to complement and compare our luminescence data. Numerous studies have already proven the dependency of denudation rates on landscape characteristics such as the mean slope of the catchments or mean hillslope gradients and to external forces such as tectonic uplift and climate [1,2,3]. [ABSTRACT FROM AUTHOR]