Determination of muon attenuation lengths in depth profiles from in situ produced cosmogenic nuclides

Braucher, Régis; Bourlès, Didier; Merchel, Silke; Romani, J. Vidal; Fernadez-Mosquera, D.; Marti, K.; Léanni, Laëtitia; Chauvet, Frédéric; Arnold, Maurice; Aumaître, Georges; Keddadouche, Karim

doi:10.1016/j.nimb.2012.05.023

Cited by 96 publications

(87 citation statements)

References 30 publications

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“…The subscript i refers to different production pathways; for 10 Be this is dominated by spallation (26), with a minor contribution from muogenic production. Production due to muons is modeled with a single exponential term (25). S T is a topographic shielding scaling factor that adjusts the incoming cosmic ray flux depending on the proportion of the sky blocked by the presence of the cliff and is modeled following established procedures (15).…”

Section: Methodsmentioning

confidence: 99%

“…For spallation, the value of P = 4.008 at·g −1 ·y −1 was obtained for the field site from the Lifton et al (14) scaling scheme. For muogenic production a single median value of P = 0.028 at·g −1 · y −1 was used to integrate both fast muon interactions and negative muon capture reactions (25). z * i = ρ r =Λ i is a production pathway-specific attenuation length scale, where ρ r is rock density (1,800 kg/m 3 used here for chalk) (17) and Λ i is the attenuation factor.…”

Section: Methodsmentioning

confidence: 99%

“…2D) and Beachy Head (BH; Fig. 2E) during spring tides on July [24][25]2013. Cliff heights at HG and BH are 15 m and 50 m, respectively.…”

Section: Significancementioning

confidence: 99%

See 2 more Smart Citations

Recent acceleration in coastal cliff retreat rates on the south coast of Great Britain

Hurst

Rood

Ellis

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

104

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Rising sea levels and increased storminess are expected to accelerate the erosion of soft-cliff coastlines, threatening coastal infrastructure and livelihoods. To develop predictive models of future coastal change we need fundamentally to know how rapidly coasts have been eroding in the past, and to understand the driving mechanisms of coastal change. Direct observations of cliff retreat rarely extend beyond 150 y, during which humans have significantly modified the coastal system. Cliff retreat rates are unknown in prior centuries and millennia. In this study, we derived retreat rates of chalk cliffs on the south coast of Great Britain over millennial time scales by coupling high-precision cosmogenic radionuclide geochronology and rigorous numerical modeling. Measured 10 Be concentrations on rocky coastal platforms were compared with simulations of coastal evolution using a Monte Carlo approach to determine the most likely history of cliff retreat. The 10 Be concentrations are consistent with retreat rates of chalk cliffs that were relatively slow (2-6 cm·y −1 ) until a few hundred years ago. Historical observations reveal that retreat rates have subsequently accelerated by an order of magnitude (22-32 cm·y −1 ). We suggest that acceleration is the result of thinning of cliff-front beaches, exacerbated by regional storminess and anthropogenic modification of the coast.geomorphology | coasts | cosmogenic radionuclides | erosion | cliffs R ocky coasts are "erosional environments formed as a result of the landward retreat of bedrock at the shoreline" (1). They leave scant evidence of any previous state, making it difficult to interpret their history. Cliff retreat is driven by a combination of wave-driven cliff-base erosion, subaerial weathering, and mass wasting processes, whose efficiencies are dependent on lithology and climate. Sediment generated by mass wasting processes such as abrasion, plucking, landslides, and rockfalls tends to be reworked and transported away by waves and currents, particularly for softer rock types.Cliff erosion due to mass wasting threatens livelihoods and both public and private clifftop infrastructure and development; quantitative estimates of the rate of cliff retreat are necessary to assess the associated risk. Rising sea levels and increased storminess may lead to accelerated coastal erosion rates in the future, potentially increasing hazard exposure (2-5). To accurately assess coastal hazards in the face of future climate and land-use changes, it is necessary to understand the dynamics of cliff erosion over length and time scales relevant to the processes that drive change. To establish the context for modern change, we must quantify the natural variability and the long-term behavior of cliff retreat. Historical records are too short to allow us to do this: they typically span no longer than ∼150 y (6, 7), which can be less than the characteristic return period of significant coastal failures (8), and they coincide with the period over which humans have significantly modified th...

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Recent acceleration in coastal cliff retreat rates on the south coast of Great Britain

Hurst

Rood

Ellis

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

104

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“…We used a reference production rate for neutrogenic spallation of 3.93 atoms g −1 a −1 (Heyman, 2014) and the scaling model by Lal (1991) and Stone (2000) to calculate the production rate for each site. Because the standard files for calculating muogenic production rate after Heisinger et al (2002a, b) yield too-high values (Braucher et al, 2003(Braucher et al, , 2013Phillips et al, 2016), we used the .m files provided Ruszkiczay-Rüdiger et al (2016). Calculations were done until 100 000 solutions were found.…”

Section: Depth Profile Calculationsmentioning

confidence: 99%

<sup>10</sup>Be depth profiles in glacial sediments on the Swiss Plateau: deposition age, denudation and (pseudo-) inheritance

Wüthrich

Brändli

Braucher

et al. 2017

E&G Quaternary Sci. J.

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“…and Rovey (2008), modified to fit muon interaction cross-sections described in Braucher et al (2013), Balco et al (2013) and references therein. Thus, instead of the original values determined experimentally by Heisinger, we used the following values in the CRONUS Matlab code: k neg10=1.2916e-04, k neg26=0.0016, sigma190 10=3.7822e-29, sigma190 26=6.9599e-28.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

Rodés

Pallàs

Ortuño

et al. 2014

Quaternary Geochronology

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Please cite this article as: Rod´es, A., Pall`as, R., Ortu˜no, M.´ı., Garc´ıa-Melendez, E., Masana, E.`a., Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia), Quaternary Geochronology (2013), doi: 10.1016/j.quageo.2013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTCombined surface exposure and burial dating provides robust minimum and maximum ages. It also provides constraints for the exhumation rate and sediment residence time. Results suggest that El Límite alluvial fat was deposited in the Late Pleistocene. El Límite sediments were reworked due to the activity of the South-AMF. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTCombining surface exposure dating and burial dating from paired cosmogenic depth profiles.Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)Several authors * October 1, 2013Abstract Cosmogenic nuclide depth-profiles are used to calculate the age of landforms, the rates at which erosion has affected them since their formation and, in case of deposits, the paleo-erosion rate in the source area. However, two difficulties are typically encountered: 1) old deposits or strongly affected by cosmogenic nuclide inheritance often appear to be saturated, and 2) a full propagation of uncertainties often yields poorly constrained ages. Here we show how to combine surface-exposure-dating and burial-dating techniques in the same profile to get more accurate age results and to constrain the extent of pre-depositional burial periods. A 10 Be-26 Al depth-profile measured in an alluvial fan of SE Iberia is presented as a natural example.

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Determination of muon attenuation lengths in depth profiles from in situ produced cosmogenic nuclides

Cited by 96 publications

References 30 publications

Recent acceleration in coastal cliff retreat rates on the south coast of Great Britain

Recent acceleration in coastal cliff retreat rates on the south coast of Great Britain

<sup>10</sup>Be depth profiles in glacial sediments on the Swiss Plateau: deposition age, denudation and (pseudo-) inheritance

Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

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Determination of muon attenuation lengths in depth profiles from in situ produced cosmogenic nuclides

Cited by 96 publications

References 30 publications

Recent acceleration in coastal cliff retreat rates on the south coast of Great Britain

Recent acceleration in coastal cliff retreat rates on the south coast of Great Britain

&lt;sup&gt;10&lt;/sup&gt;Be depth profiles in glacial sediments on the Swiss Plateau: deposition age, denudation and (pseudo-) inheritance

Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

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<sup>10</sup>Be depth profiles in glacial sediments on the Swiss Plateau: deposition age, denudation and (pseudo-) inheritance