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

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Sediment recycling in Australia's Murray-Darling basin significantly delays and alters environmental signals. This process, involving burial and reexposure, impacts our ability to interpret geologic records accurately.

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Area of Science:

  • Geomorphology
  • Quaternary Science
  • Isotope Geochemistry

Background:

  • Interpreting Earth's geologic record requires understanding how external forces like tectonics and climate are recorded in sediments.
  • Sediment transport and storage dynamics can significantly alter, delay, or erase these signals, complicating geological interpretations.

Purpose of the Study:

  • To estimate sediment transit times within Australia's Murray-Darling basin.
  • To investigate the impact of sediment recycling on the fidelity of tectonic and climatic signals in river systems.

Main Methods:

  • Utilized cosmogenic nuclide dating, specifically measuring downstream changes in aluminum-26/beryllium-10/carbon-14 (26Al/10Be/14C) ratios.
  • Analyzed modern river sediment samples from the Murray and Darling rivers.

Main Results:

  • Sediments in the Murray-Darling basin exhibit multiple episodes of burial and reexposure.
  • Cumulative sediment lag times exceed 1 million years in the downstream reaches of the Murray and Darling rivers.
  • Low sediment supply rates and extensive old sediment cover characterize the landscape.

Conclusions:

  • Sediment recycling is a significant and ongoing process in the Murray-Darling basin.
  • This recycling substantially delays and modifies environmental forcing signals originating from the river system's hinterland.
  • Accurate interpretation of the geologic record is challenged by these complex sediment dynamics.