Million-year lag times in a post-orogenic sediment conveyor

R. H. Fülöp, A. T. Codilean, K. M. Wilcken, T. J. Cohen, D. Fink, A. M. Smith, B. Yang, V. A. Levchenko, L. Wacker, S. K. Marx, N. Stromsoe, T. Fujioka, T. J. Dunai

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Abstract

Understanding how sediment transport and storage will delay, attenuate, and even erase the erosional signal of tectonic and climatic forcings has bearing on our ability to read and interpret the geologic record effectively. Here, we estimate sediment transit times in Australia's largest river system, the Murray-Darling basin, by measuring downstream changes in cosmogenic 26Al/10Be/14C ratios in modern river sediment. Results show that the sediments have experienced multiple episodes of burial and reexposure, with cumulative lag times exceeding 1 Ma in the downstream reaches of the Murray and Darling rivers. Combined with low sediment supply rates and old sediment blanketing the landscape, we posit that sediment recycling in the Murray-Darling is an important and ongoing process that will substantially delay and alter signals of external environmental forcing transmitted from the sediment's hinterland.

Original languageEnglish
Article numbereaaz8845
Pages (from-to)1-7
Number of pages7
JournalScience Advances
Volume6
Issue number25
DOIs
Publication statusPublished - 17 Jun 2020

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    Fülöp, R. H., Codilean, A. T., Wilcken, K. M., Cohen, T. J., Fink, D., Smith, A. M., Yang, B., Levchenko, V. A., Wacker, L., Marx, S. K., Stromsoe, N., Fujioka, T., & Dunai, T. J. (2020). Million-year lag times in a post-orogenic sediment conveyor. Science Advances, 6(25), 1-7. [eaaz8845]. https://doi.org/10.1126/sciadv.aaz8845