A test of rock surface luminescence dating using glaciofluvial boulders from the Chinese Pamir

Luo, Ming; Jie, Chen; Liu, Jinfeng; Qin, Jintang; Owen, Lewis A.; Han, Fei; Yang, Haijun; Wang, Haoran; Zhang, Boxuan; Yin, Juan; Li, Yuehua

doi:10.1016/j.radmeas.2018.07.017

Cited by 19 publications

(9 citation statements)

References 37 publications

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“…Multiple luminescence signals can now be measured from the same slice to obtain the maximum amount of information (e.g. Jenkins et al, 2018;Luo et al, 2018;Meyer et al, 2018;Elkadi et al, 2021;Smedley et al, 2021). Although both TCN and OSL surface exposure dating are influenced by exposure time, they are also affected by surface erosion, and if this is not accounted for, then it can lead to an underestimation of exposure ages (e.g.…”

Section: Measuring Erosion Rates In Deglaciated Environmentsmentioning

confidence: 99%

Quantification of post-glacier bedrock surface erosion in the European Alps using¹⁰Be and optically stimulated luminescence exposure dating

et al. 2022

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Abstract. The retreat of glaciers since the Last Glacial Maximum in the European Alps has left an imprint on topography through various erosional processes. However, few methods are currently capable of resolving these mechanisms on Late Glacial to Holocene timescales. Quantifying the relative contributions of mountain erosion, during these different climate cycles, is useful for understanding long-term landscape evolution and the links between global climate and erosion. Here, we combine three optically stimulated luminescence (OSL) exposure dating signals with 10Be surface exposure dating to constrain the post-glacier erosion rates of bedrock samples adjacent to the Gorner Glacier in the European Alps. The results reveal erosion rates of the order of 10−2 to 10−1 mm a−1, in general agreement with other studies in the region, as well as a strong negative correlation between erosion rate and elevation, suggesting that frost crack weathering is perhaps not the dominant form of post-glacier weathering. Finally, a global compilation of both subglacial and periglacial erosion rates shows that periglacial erosion rates could be greater than previously thought. Yet subglacial erosion remains higher, implying that it continues to have the stronger influence on shaping landscapes. Therefore, with a changing climate, periglacial erosion rates are likely to remain transient. These insights could lead to important implications for landscape evolution models.

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Section: Measuring Erosion Rates In Deglaciated Environmentsmentioning

confidence: 99%

Quantification of post-glacier bedrock surface erosion in the European Alps using¹⁰Be and optically stimulated luminescence exposure dating

et al. 2022

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“…Singhvi et al,1986;Parish, 1994) and likely increased light attenuation with depth (e.g. Meyer et al 2018;Luo et al 2018). Consequently, the parameterisation of μ and 0 derived from sample ROAD02 would be inaccurate for BALL02.…”

Section: Luminescence Depth Profiles At Beinn Alligin Rock Avalanchementioning

confidence: 99%

Erosion rates in a wet, temperate climate derived from rock luminescence techniques

Smedley¹,

Small²,

Jones³

et al. 2021

Preprint

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Abstract. A new luminescence erosion-meter has huge potential for inferring erosion rates on sub-millennial scales for both steady and transient states of erosion, which is currently not possible with any existing techniques capable of measuring erosion. This study applies new rock luminescence techniques to a well-constrained scenario provided by the Beinn Alligin rock avalanche, NW Scotland. Boulders in this deposit are lithologically consistent, have known cosmogenic nuclide ages, and independently-derived Holocene erosion rates. We find that luminescence-derived exposure ages for the Beinn Alligin rock avalanche were an order of magnitude younger than existing cosmogenic nuclide exposure ages, suggestive of high erosion rates (as supported by field evidence of quartz grain protrusions on the rock surfaces). Erosion rates determined by luminescence were consistent with independently-derived rates measured from boulder-edge roundness. Inversion modelling indicates a transient state of erosion reflecting the stochastic nature of erosional processes over the last ~4 ka in the wet, temperate climate of NW Scotland. Erosion was likely modulated by known fluctuations in moisture availability, and to a lesser extent temperature, which controlled the extent of chemical weathering of these highly-lithified rocks prior to erosion. The use of a multi-elevated temperature, post-infra-red, infra-red stimulated luminescence (MET-pIRIR) protocol (50, 150 and 225 °C) was advantageous as it identified samples with complexities introduced by within-sample variability (e.g. surficial coatings). This study demonstrates that the luminescence erosion-meter can infer accurate erosion rates on sub-millennial scales and identify transient states of erosion (i.e. stochastic processes) in agreement with independently-derived erosion rates for the same deposit.

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“…Since the introduction of the new rock luminescence techniques, most studies on K feldspar (except Luo et al, 2019) have only utilised the IR 50 signal as it bleaches more efficiently with depth into rock surfaces compared to higher-temperature post-IR infra-red stimulated luminescence (IRSL) signals (e.g. Luo et al, 2018;Ou et al, 2018). However, electron multiplying charged coupled device (EM-CCD) measurements of four rock types (quartzite, orthoclase and two different granites) have shown that the post-IR IRSL signals of rock slices were dominated by K feldspars, while Na-rich feldspars can contribute towards the IR 50 signal (Thomsen et al, 2018).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…This suggests that these surfaces experienced complex erosional histories over time whereby the erosion rate was time varying. Consequently, it is possible that surficial weathering products may have changed in thickness and composition over time, which in turn could slightly vary the attenuation of light (Meyer et al, 2018;Luo et al, 2018), meaning that the calibration of σ ϕ 0 and µ from ROAD02 here introduced uncertainty into the inferred erosion model as it was not time varying. It is also possible that sample-specific measurements of σ ϕ 0 and µ (e.g.…”

Section: Apparent Exposure Ages and Erosion Ratesmentioning

confidence: 99%

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Erosion rates in a wet, temperate climate derived from rock luminescence techniques

et al. 2021

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Abstract. A new luminescence erosion meter has huge potential for inferring erosion rates on sub-millennial scales for both steady and transient states of erosion, which is not currently possible with any existing techniques capable of measuring erosion. This study applies new rock luminescence techniques to a well-constrained scenario provided by the Beinn Alligin rock avalanche, NW Scotland. Boulders in this deposit are lithologically consistent and have known cosmogenic nuclide ages and independently derived Holocene erosion rates. We find that luminescence-derived exposure ages for the Beinn Alligin rock avalanche were an order of magnitude younger than existing cosmogenic nuclide exposure ages, suggestive of high erosion rates (as supported by field evidence of quartz grain protrusions on the rock surfaces). Erosion rates determined by luminescence were consistent with independently derived rates measured from boulder edge roundness. Inversion modelling indicates a transient state of erosion reflecting the stochastic nature of erosional processes over the last ∼4.5 kyr in the wet, temperate climate of NW Scotland. Erosion was likely modulated by known fluctuations in moisture availability and to a lesser extent temperature, which controlled the extent of chemical weathering of these highly lithified rocks prior to erosion. The use of a multi-elevated temperature, post-infra-red, infra-red stimulated luminescence (MET-pIRIR) protocol (50, 150 and 225 ∘C) was advantageous as it identified samples with complexities that would not have been observed using only the standard infra-red stimulated luminescence (IRSL) signal measured at 50 ∘C, such as that introduced by within-sample variability (e.g. surficial coatings). This study demonstrates that the luminescence erosion meter can infer accurate erosion rates on sub-millennial scales and identify transient states of erosion (i.e. stochastic processes) in agreement with independently derived erosion rates for the same deposit.

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A test of rock surface luminescence dating using glaciofluvial boulders from the Chinese Pamir

Cited by 19 publications

References 37 publications

Quantification of post-glacier bedrock surface erosion in the European Alps using¹⁰Be and optically stimulated luminescence exposure dating

Quantification of post-glacier bedrock surface erosion in the European Alps using¹⁰Be and optically stimulated luminescence exposure dating

Erosion rates in a wet, temperate climate derived from rock luminescence techniques

Erosion rates in a wet, temperate climate derived from rock luminescence techniques

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A test of rock surface luminescence dating using glaciofluvial boulders from the Chinese Pamir

Cited by 19 publications

References 37 publications

Quantification of post-glacier bedrock surface erosion in the European Alps using10Be and optically stimulated luminescence exposure dating

Quantification of post-glacier bedrock surface erosion in the European Alps using10Be and optically stimulated luminescence exposure dating

Erosion rates in a wet, temperate climate derived from rock luminescence techniques

Erosion rates in a wet, temperate climate derived from rock luminescence techniques

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Product

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Quantification of post-glacier bedrock surface erosion in the European Alps using¹⁰Be and optically stimulated luminescence exposure dating

Quantification of post-glacier bedrock surface erosion in the European Alps using¹⁰Be and optically stimulated luminescence exposure dating