Geological calibration of spallation production rates in the CRONUS-Earth project

Borchers, Brian; Marrero, Shasta M.; Balco, Greg; Caffee, Marc W.; Goehring, Brent M.; Lifton, Nathaniel A.; Nishiizumi, K.; Phillips, Fred M.; Schaefer, Joerg M.; Stone, John O.

doi:10.1016/j.quageo.2015.01.009

Cited by 562 publications

(575 citation statements)

References 48 publications

(54 reference statements)

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“…Be SLHL spallogenic production rate is statistically identical to those reported in (Borchers et al, 2016). We use the updated 10 Be half-life of 1.387 ± 0.012…”

mentioning

confidence: 84%

Recycling of Pleistocene valley fills dominates 135 ka of sediment flux, upper Indus River

Munack

Blöthe

Fülöp

et al. 2016

Quaternary Science Reviews

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Rivers draining the semiarid Transhimalayan Ranges at the western Tibetan Plateau margin underwent alternating phases of massive valley infill and incision in Pleistocene times. The effects of these cut-and-fill cycles on millennial sediment fluxes have remained largely elusive. We investigate the timing and geomorphic consequences of headward incision of the Zanskar River, a tributary to the Indus, which taps the >250-m thick More Plains valley fill that currently plugs the endorheic high-altitude basins of Tso Kar and Tso Moriri. In situ 10Be exposure dating and topographic analyses show that a phase of valley infill gave way to net dissection and the NW Himalaya's first directly dated stream capture in late Marine Isotope Stage (MIS) 6, ∼135 ka ago. Headwaters of the Indus are currently capturing headwaters of the Sutlej, and rivers have eroded >14.7 km3 of sediment from the Zanskar headwaters since, mobilising an equivalent of ∼8% of the Indus' contemporary sediment storage volume from only 0.3% of its catchment area. The resulting specific sediment yields are among the rarely available rates averaged over the 105-yr timescale, and surpass 10Be-derived denudation rates from neighbouring catchments three-to tenfold. We conclude that recycling of Pleistocene valley fills has fed Transhimalayan headwaters with more sediment than liberated by catchment denudation, at least since the last glacial cycle began. This protracted release of sediment from thick Pleistocene valley fills might bias estimates of current sediment loads and long-term catchment denudation. Disciplines Medicine and Health Sciences | Social and Behavioral Sciences

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“…Be SLHL spallogenic production rate is statistically identical to those reported in (Borchers et al, 2016). We use the updated 10 Be half-life of 1.387 ± 0.012…”

mentioning

confidence: 84%

Recycling of Pleistocene valley fills dominates 135 ka of sediment flux, upper Indus River

Munack

Blöthe

Fülöp

et al. 2016

Quaternary Science Reviews

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“…and compute the production and decay/erosion of 10 Be and 26 Al throughout the Quaternary for different combinations of the model parameters, and compare the results to the measured concentrations between each simulation. We use a sea level high-latitude 10 Be production rate of 4.01 atoms g −1 per year and 26 Al production rate of 27.07 atoms g −1 per year, based on the calibration set by Borchers et al 39. for 10 Be and 26 Al surface production rates and the Lal (1991)/Stone (2000) scaling scheme4041 for all 49 samples from the three areas in west Greenland (see Supplementary Data 1).…”

Section: Methodsmentioning

confidence: 99%

One million years of glaciation and denudation history in west Greenland

et al. 2017

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The influence of major Quaternary climatic changes on growth and decay of the Greenland Ice Sheet, and associated erosional impact on the landscapes, is virtually unknown beyond the last deglaciation. Here we quantify exposure and denudation histories in west Greenland by applying a novel Markov-Chain Monte Carlo modelling approach to all available paired cosmogenic 10Be-26Al bedrock data from Greenland. We find that long-term denudation rates in west Greenland range from >50 m Myr−1 in low-lying areas to ∼2 m Myr−1 at high elevations, hereby quantifying systematic variations in denudation rate among different glacial landforms caused by variations in ice thickness across the landscape. We furthermore show that the present day ice-free areas only were ice covered ca. 45% of the past 1 million years, and even less at high-elevation sites, implying that the Greenland Ice Sheet for much of the time was of similar size or even smaller than today.

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“…Al ages using the updated, globally averaged production rate with Lm scaling (originally reported by Borchers et al, 2016) Be ages have been determined for a single boulder (Benson et al, 2004;Brugger, 2007) Be age varies greatly sample-to-sample, but on average the 36 Cl ages are about 7.5% younger than the recalculated 10 Be ages.…”

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confidence: 99%

Deglaciation of the Colorado Rocky Mountains following the Last Glacial Maximum

Leonard

Laabs

Schweinsberg

et al. 2017

CIG

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ABSTRACT. The availability of almost 180 cosmogenic-radionuclide (CRN) surface-exposure ages from moraine boulders and glacially polished bedrock surfaces makes possible an assessment of the timing and character of the local Last Glacial Maximum (LLGM) and subsequent deglaciation in the Colorado Rocky Mountains. A review of glacial chronologies and numerical modeling results indicates that although glaciers across

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Geological calibration of spallation production rates in the CRONUS-Earth project

Cited by 562 publications

References 48 publications

Recycling of Pleistocene valley fills dominates 135 ka of sediment flux, upper Indus River

Recycling of Pleistocene valley fills dominates 135 ka of sediment flux, upper Indus River

One million years of glaciation and denudation history in west Greenland

Deglaciation of the Colorado Rocky Mountains following the Last Glacial Maximum

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