Beryllium-10 terrestrial cosmogenic nuclide surface exposure dating of Quaternary landforms in Death Valley

Owen, Lewis A.; Frankel, Kurt L.; Knott, Jeffrey R.; Reynhout, Scott A.; Finkel, Robert C.; Dolan, James F.; Lee, Jeffrey

doi:10.1016/j.geomorph.2010.10.024

Cited by 70 publications

(62 citation statements)

References 52 publications

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“…Weathering, exhumation, prior exposure, and shielding of the surface by sediment and/or snow will generally produce an underestimate of the true age of the landforms (Owen et al, 2011). In contrast, exposure of rock surfaces prior to deposition on the landform being dated results in overestimates of true ages of the landform.…”

Section: Numerical Datingmentioning

confidence: 99%

“…Putkonen and Swanson (2003) and Heyman et al (2011) argue that prior exposure is rare on moraines and that erosion of the landform and the boulder itself is more common; such that the oldest date in a population of TCN dates on a surface more likely reflects the true age of the landform. Boulders with prior exposure are more common on alluvial fans and terraces (e.g., Owen et al, 2011) and younger ages in the population of TCN dates might be closer to the true age of the landforms. Determining which date(s) in a population most closely represents the true age of the landform is thus uncertain.…”

Section: Numerical Datingmentioning

confidence: 99%

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Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

et al. 2012

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Section: Numerical Datingmentioning

confidence: 99%

Section: Numerical Datingmentioning

confidence: 99%

Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

et al. 2012

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“…However, the significant scattering of CRN observed in distinct clasts of alluvial fans (e.g. Ritz et al, 2006;Owen et al, 2011;Schmidt et al, 2011) and along the fluvial system (Belmont et al, 2007) suggests that fluvial processes can contribute significantly and perturb the CRN signal in sediments.…”

Section: Introductionmentioning

confidence: 99%

Control of geomorphic processes on 10Be concentrations in individual clasts: Complexity of the exposure history in Gobi-Altay range (Mongolia)

2011

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International audienceThe dating of alluvial landforms by cosmogenic nuclides requires distinguishing the pre-deposition inheritance from the post-deposition history of the clasts in the studied marker. Moreover, estimating catchment-scale erosion rates from the concentrations of cosmogenic nuclides in active alluvia requires a good knowledge of the local/regional relationships between rock exhumation and transport through space and time. This is still poorly known for timescales of tens of thousand years. In order to document the evolution of clast exhumation and transport rates through time, we analyze in situ 10Be concentrations in boulders and cobbles from hillslopes to outlet of an arid mountainous catchment located in Gobi-Altay, Mongolia, strongly affected by global climatic changes during the Pleistocene-Holocene period. Samples were collected on bedrock, abandoned alluvial deposits, active colluvia and alluvia. Our results show a large 10Be scattering in the active river bed, consistent with a low and discontinuous catchment erosion rate dominated by mass wasting and fluvial incision. On the contrary, pre-exposure signal within abandoned terraces is much more homogeneous, consistent with climatic pulses responsible of strong erosional events on hillslopes and rapid fluvial transport. These results show that exhumation/transport processes at the catchment scale vary in style and intensity through time as a consequence of climatic oscillations. The occurrence of abrupt climatic changes during short periods of time recorded by 10Be concentrations in abandoned alluvia raise questions about the temporal applicability of catchment erosion rates derived from cosmogenic nuclide concentrations measured in sediments of active rivers. On the other hand, strong and short erosion events limit and homogenize the pre-exposure 10Be signal in associated deposits like debris-flows, making them particularly suitable markers for dating in active tectonic and paleoclimatic studies

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“…Since weathering, exhumation, and shielding of surfaces by sediment or snow will lead to ages that are younger than the true age of the landform (e.g., Heyman et al, 2011;Owen et al, 2011), we assume that the ages for the boulders exposed on the Penrod Canyon pediment (Fig. 8) are the minimum exposure ages for each sample.…”

Section: Cosmogenic Nuclide Exposure Age Datingmentioning

confidence: 99%

The unusual temporal and spatial slip history of the Wassuk Range normal fault, western Nevada (USA): Implications for seismic hazard and Walker Lane deformation

Surpless

Kroeger

2014

Geological Society of America Bulletin

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Beryllium-10 terrestrial cosmogenic nuclide surface exposure dating of Quaternary landforms in Death Valley

Cited by 70 publications

References 52 publications

Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

Control of geomorphic processes on 10Be concentrations in individual clasts: Complexity of the exposure history in Gobi-Altay range (Mongolia)

The unusual temporal and spatial slip history of the Wassuk Range normal fault, western Nevada (USA): Implications for seismic hazard and Walker Lane deformation

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