Tracking the 10Be–26AI source-area signal in sediment-routing systems of arid central Australia

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dc.contributor.authorStruck, Men_AU
dc.contributor.authorJansen, JDen_AU
dc.contributor.authorFujioka, Ten_AU
dc.contributor.authorCodilean, ATen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorFülöp, RHen_AU
dc.contributor.authorWilcken, KMen_AU
dc.contributor.authorPrice, DMen_AU
dc.contributor.authorKotevski, Sen_AU
dc.contributor.authorFifield, LKen_AU
dc.contributor.authorChappell, Jen_AU
dc.date.accessioned2021-12-20T23:24:40Zen_AU
dc.date.available2021-12-20T23:24:40Zen_AU
dc.date.issued2018-05-07en_AU
dc.date.statistics2021-11-16en_AU
dc.description.abstractSediment-routing systems continuously transfer information and mass from eroding source areas to depositional sinks. Understanding how these systems alter environmental signals is critical when it comes to inferring source-area properties from the sedimentary record. We measure cosmogenic 10Be and 26Al along three large sediment-routing systems (∼ 100 000 km2) in central Australia with the aim of tracking downstream variations in 10Be–26Al inventories and identifying the factors responsible for these variations. By comparing 56 new cosmogenic 10Be and 26Al measurements in stream sediments with matching data (n= 55) from source areas, we show that 10Be–26Al inventories in hillslope bedrock and soils set the benchmark for relative downstream modifications. Lithology is the primary determinant of erosion-rate variations in source areas and despite sediment mixing over hundreds of kilometres downstream, a distinct lithological signal is retained. Post-orogenic ranges yield catchment erosion rates of ∼ 6–11 m Myr−1 and silcrete-dominant areas erode as slow as ∼ 0.2 m Myr−1. 10Be–26Al inventories in stream sediments indicate that cumulative-burial terms increase downstream to mostly ∼ 400–800 kyr and up to ∼ 1.1 Myr. The magnitude of the burial signal correlates with increasing sediment cover downstream and reflects assimilation from storages with long exposure histories, such as alluvial fans, desert pavements, alluvial plains, and aeolian dunes. We propose that the tendency for large alluvial rivers to mask their 10Be–26Al source-area signal differs according to geomorphic setting. Signal preservation is favoured by (i) high sediment supply rates, (ii) high mean runoff, and (iii) a thick sedimentary basin pile. Conversely, signal masking prevails in landscapes of (i) low sediment supply and (ii) juxtaposition of sediment storages with notably different exposure histories. © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 Licenceen_AU
dc.identifier.citationStruck, M., Jansen, J. D., Fujioka, T., Codilean, A. T., Fink, D., Fülöp, R.-H., Wilcken, K. M., Price, D. M., Kotevski, S., Fifield, L. K., & Chappell, J. (2018). Tracking the 10Be–26Al source-area signal in sediment-routing systems of arid central Australia. Earth Surface Dynamics, 6(2), 329–349. doi:10.5194/esurf-6-329-2018en_AU
dc.identifier.issn2196-632Xen_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleEarth Surface Dynamicsen_AU
dc.identifier.pagination329–349en_AU
dc.identifier.urihttps://doi.org/10.5194/esurf-6-329-2018en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12595en_AU
dc.identifier.volume6en_AU
dc.language.isoenen_AU
dc.publisherEuropean Geosciences Unionen_AU
dc.subjectAluminium 26en_AU
dc.subjectBeryllium 10en_AU
dc.subjectSedimentsen_AU
dc.subjectArid landsen_AU
dc.subjectAustraliaen_AU
dc.subjectErosionen_AU
dc.subjectAlluvial depositsen_AU
dc.subjectSanden_AU
dc.subjectDesertsen_AU
dc.subjectGeomorphologyen_AU
dc.titleTracking the 10Be–26AI source-area signal in sediment-routing systems of arid central Australiaen_AU
dc.typeJournal Articleen_AU
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