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Lowland River Responses To Intraplate Tectonism And Climate Forcing Quantified With Luminescence And Cosmogenic 10be, J D. Jansen, G C. Nanson, T J. Cohen, T Fujioka, D Fabel, J R. Larsen, A T. Codilean, D M. Price, H H. Bowman, J.-H May, L A. Gliganic

Faculty of Science, Medicine and Health - Papers: part A

Intraplate tectonism has produced large-scale folding that steers regional drainage systems, such as the 1600 km-long Cooper Ck, en route to Australia's continental depocentre at Lake Eyre. We apply cosmogenic 10Be exposure dating in bedrock, and luminescence dating in sediment, to quantify the erosional and depositional response of Cooper Ck where it incises the rising Innamincka Dome. The detachment of bedrock joint-blocks during extreme floods governs the minimum rate of incision (17.4±6.5 mm/ky) estimated using a numerical model of episodic erosion calibrated with our 10Be measurements. The last big-flood phase occurred no earlier than ∼112–121 ka. Upstream of the Innamincka …