2019
DOI: 10.1002/esp.4744
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26Al/10Be ratios reveal the source of river sediments in the Kimberley, NW Australia

Abstract: We use cosmogenic 10 Be and 26 Al in both bedrock and fluvial sediments to investigate controls on erosion rates and sediment supply to river basins at the regional scale in the Kimberley, NW Australia. The area is characterised by lithologically controlled morphologies such as cuestas, isolated mesas and extensive plateaus made of slightly dipping, extensively jointed sandstones. All sampled bedrock surfaces at plateau tops, ridgelines, and in the broader floodplain of major rivers over the region show simila… Show more

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Cited by 8 publications
(9 citation statements)
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“…Blocks that had corresponding strata K–U thicknesses and morphologically matching surfaces could be merged to construct a tabular conjoin set that could be refitted to the cliff (Figure 14). The matching strata were consistent with their conjoining edge morphologies, a good indication of the reliability of strata correspondences among the hard and slow‐weathering quartzites of the Warton Sandstone formation (Cazes et al, 2020; Delannoy et al, 2013) (Figure 3). Conversely, many blocks could not be matched, often because vegetation or sediments covered important details relating to the thickness of individual strata and surface morphologies.…”
Section: Resultssupporting
confidence: 57%
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“…Blocks that had corresponding strata K–U thicknesses and morphologically matching surfaces could be merged to construct a tabular conjoin set that could be refitted to the cliff (Figure 14). The matching strata were consistent with their conjoining edge morphologies, a good indication of the reliability of strata correspondences among the hard and slow‐weathering quartzites of the Warton Sandstone formation (Cazes et al, 2020; Delannoy et al, 2013) (Figure 3). Conversely, many blocks could not be matched, often because vegetation or sediments covered important details relating to the thickness of individual strata and surface morphologies.…”
Section: Resultssupporting
confidence: 57%
“…This emphasises the importance of determining when and how rock shelters formed while ascertaining occupational trends within sites and across landscapes. Such questions also lead us to further examine the mechanisms of landscape evolution for the Borologa hillside (see also Cazes et al, 2020; Young, 1987).…”
Section: Discussionmentioning
confidence: 99%
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“…A strong lithological control on denudation rates has been documented in numerous postorogenic landscapes, more recent salient examples including the Cape Mountains of South Africa [Scharf et al, 2013], the Pyrenees [Bernard et al, 2019], the Kimberley plateau in Western Australia [Cazes et al, 2020], and the Quadrilátero Ferrífero in Brazil [Peifer et al, 2020]. In contrast to the above, and despite well documented instances of a strong (localised) lithological control on escarpment retreat in south-eastern Australia [e.g., Nott et al, 1996], lithology does not seem to exert a first order control on 10 Be-derived denudation rates along the East Australian passive margin ( Figure 10).…”
Section: Links Between Denudation Rates and Lithologymentioning
confidence: 99%