Data Supplement to: Cosmogenic 10Be in river sediment: where grain size matters and why
Cite as:
van Dongen, Renee; Scherler, Dirk; Wittmann, Hella; von Blanckenburg, Friedhelm (2019): Data Supplement to: Cosmogenic 10Be in river sediment: where grain size matters and why. GFZ Data Services. https://doi.org/10.5880/GFZ.3.3.2019.002
Status
I N R E V I E W : van Dongen, Renee; Scherler, Dirk; Wittmann, Hella; von Blanckenburg, Friedhelm (2019): Data Supplement to: Cosmogenic 10Be in river sediment: where grain size matters and why. GFZ Data Services. https://doi.org/10.5880/GFZ.3.3.2019.002
Abstract
Concentrations of in-situ-produced cosmogenic 10Be in river sediment are widely used to estimate catchment-average denudation rates. Typically, the 10Be concentrations are measured in the sand fraction of river sediment. However, the grain size of bedload sediment in most bedrock rivers covers a much wider range. Where 10Be concentrations depend on grain size, denudation rate estimates based on the sand fraction alone are potentially biased. To date, knowledge about catchment attributes that may induce grain-size-dependent 10Be concentrations is incomplete or has only been investigated in modelling studies. Here we present an empirical study on the occurrence of grain-size-dependent 10Be concentrations and the potential controls of hillslope angle, precipitation, lithology, and abrasion.
We first conducted a study focusing on the sole effect of precipitation in four granitic catchments located on a climate gradient in the Chilean Coastal Cordillera. We found that observed grain size dependencies of 10Be concentrations in the most-arid and most-humid catchments could be explained by the effect of precipitation on both the scouring depth of erosion processes and the depth of the mixed soil layer. Analysis of a global dataset of published 10Be concentrations in different grain sizes (n=73 catchments) – comprising catchments with contrasting hillslope angles, climate, lithology, and catchment size – revealed a similar pattern. Lower 10Be concentrations in coarse grains (defined as “negative grain size dependency”) emerge frequently in catchments which likely have thin soil and where deep-seated erosion processes (e.g. landslides) excavate grains over a larger depth interval. These catchments include steep (> 25°) and humid catchments (> 2000mm yr-1). Furthermore, we found that an additional cause of negative grain size dependencies may emerge in large catchments with weak lithologies and long sediment travel distances (> 2300–7000 m, depending on lithology) where abrasion may lead to a grain size distribution that is not representative for the entire catchment. The results of this study can be used to evaluate whether catchment-average denudation rates are likely to be biased in particular catchments.
Samples from the Chilean Coastal Cordillera were processed in the Helmholtz Laboratory for the Geochemistry of the Earth Surface (HELGES). 10Be/9Be ratios were measured at the University of Cologne and normalized to the KN01-6-2 and KN01-5-3 standards. Denudation rates were calculated using a time-independent scaling scheme according to Lal (1991) and Stone (2002) (St scaling scheme) and the SLHL production rate of 4.01 at g-1 yr-1 as reported by Phillips et al. (2016)
The global compilation exists of studies that measured 10Be concentrations in different grain sizes from the same sample location. We only included river basins of <5000 km2 which measured 10Be concentrations in at least one sand-sized fraction <2 mm and at least one coarser fraction >2 mm. Catchment parameters have been recalculated using a 90-m SRTM DEM.
The data are presented in Excel and csv tables. Table S1 describes the characteristics of the samples catchments, Table S2 includes the grain size dependent 10Be-concentrations measured during this study and Table 3 the global compilation of grain size dependent 10Be-concentrations. All samples of this study (the Chilean Coastal Cordillera) are assigned with International Geo Sample Numbers (IGSN). The IGSN links are included in Table S2 and in the Related References Section on the DOI Landing Page. The data are described in detail in the data description file and in van Dongen et al. (2018) to which they are supplementary material to.
Additional Information
The DFG Priority Program 1803 "EarthShape - Earth Surface Shaping by Biota" (2016-2022; https://www.earthshape.net/) explored between scientific disciplines and includes geoscientists and biologists to study from different viewpoints the complex question how microorganisms, animals, and plants influence the shape and development of the Earth’s surface over time scales from the present-day to the young geologic past. All study sites are located in the north-to-south trending Coastal Cordillera mountains of Chile, South America. These sites span from the Atacama Desert in the north to the Araucaria forests approximately 1300 km to the south. The site selection contains a large ecological and climate gradient ranging from very dry to humid climate conditions.
Authors
van Dongen, Renee;GFZ German Research Centre for Geosciences, Potsdam, Germany
Scherler, Dirk;GFZ German Research Centre for Geosciences, Potsdam, Germany
Wittmann, Hella;GFZ German Research Centre for Geosciences, Potsdam, Germany
von Blanckenburg, Friedhelm;GFZ German Research Centre for Geosciences, Potsdam, Germany;Freie Universität Berlin, Berlin, Germany
Contact
van Dongen, Renee
(PhD Student); GFZ German Research Centre for Geosciences, Potsdam, Germany; ➦
Scherler, Dirk
(Junior Professor); GFZ German Research Centre for Geosciences, Potsdam, Germany; ➦
Contributors
HELGES – Helmholtz-Laboratory for the Geochemistry of the Earth Surface (GFZ German Research Centre for Geosciences, Germany); University of Cologne - Centre for Accelerator Mass Spectrometry (AMS) (University of Cologne, Germany)
Funders
Deutsche Forschungsgemeinschaft:
SPP-1803 “EarthShape: Earth Surface Shaping by Biota” (SCHE 1676/4-1)
Keywords
Denudation, Grain size dependent 10Be-concentrations, Chile, Coastal Cordillera, Global compilation, Cosmogenic 10Be, Cosmogenic nuclides, EarthShape, National Park Pan de Azúcar, Private Reserve Santa Gracia, National Park Nahuelbuta, chemical element > element of group II (alkaline earth metals) > beryllium
affiliation (affiliationIdentifier=0000-0002-7246-511X affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation (affiliationIdentifier=0000-0003-3911-2803 affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation (affiliationIdentifier=0000-0002-1252-7059 affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
creator
creatorName (nameType=Personal): von Blanckenburg, Friedhelm
affiliation (affiliationIdentifier=0000-0002-2964-717X affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation: Freie Universität Berlin, Berlin, Germany
titles
title: Data Supplement to: Cosmogenic 10Be in river sediment: where grain size matters and why
publisher: GFZ Data Services
publicationYear: 2019
subjects
subject: Denudation
subject: Grain size dependent 10Be-concentrations
subject: Chile
subject: Coastal Cordillera
subject: Global compilation
subject: Cosmogenic 10Be
subject: Cosmogenic nuclides
subject: EarthShape
subject: National Park Pan de Azúcar
subject: Private Reserve Santa Gracia
subject: National Park La Campana
subject: National Park Nahuelbuta
subject (subjectScheme=GEMET - INSPIRE themes, version 1.0): chemical element > element of group II (alkaline earth metals) > beryllium
affiliation (affiliationIdentifier=0000-0002-7246-511X affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
contributor (contributorType=DataCollector)
contributorName (nameType=Personal): van Dongen, Renee
affiliation (affiliationIdentifier=0000-0002-7246-511X affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
contributor (contributorType=Producer)
contributorName (nameType=Personal): van Dongen, Renee
affiliation (affiliationIdentifier=0000-0002-7246-511X affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation (affiliationIdentifier=0000-0003-3911-2803 affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation (affiliationIdentifier=0000-0003-3911-2803 affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation (affiliationIdentifier=0000-0003-3911-2803 affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation (affiliationIdentifier=0000-0002-1252-7059 affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
contributor (contributorType=ProjectManager)
contributorName (nameType=Personal): von Blanckenburg, Friedhelm
affiliation (affiliationIdentifier=0000-0002-2964-717X affiliationIdentifierScheme=ORCID): GFZ German Research Centre for Geosciences, Potsdam, Germany
affiliation: Freie Universität Berlin, Berlin, Germany
contributor (contributorType=HostingInstitution)
contributorName: HELGES – Helmholtz-Laboratory for the Geochemistry of the Earth Surface (GFZ German Research Centre for Geosciences, Germany)
affiliation (affiliationIdentifier= affiliationIdentifierScheme=): GFZ German Research Centre for Geosciences, Potsdam, Germany
contributor (contributorType=HostingInstitution)
contributorName: University of Cologne - Centre for Accelerator Mass Spectrometry (AMS) (University of Cologne, Germany)
affiliation (affiliationIdentifier= affiliationIdentifierScheme=): University of Cologne, Cologne, Germany
contributor (contributorType=ContactPerson)
contributorName: van Dongen, Renee
affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
contributor (contributorType=ContactPerson)
contributorName: Scherler, Dirk
affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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We first conducted a study focusing on the sole effect of precipitation in four granitic catchments located on a climate gradient in the Chilean Coastal Cordillera. We found that observed grain size dependencies of 10Be concentrations in the most-arid and most-humid catchments could be explained by the effect of precipitation on both the scouring depth of erosion processes and the depth of the mixed soil layer. Analysis of a global dataset of published 10Be concentrations in different grain sizes (n=73 catchments) – comprising catchments with contrasting hillslope angles, climate, lithology, and catchment size – revealed a similar pattern. Lower 10Be concentrations in coarse grains (defined as “negative grain size dependency”) emerge frequently in catchments which likely have thin soil and where deep-seated erosion processes (e.g. landslides) excavate grains over a larger depth interval. These catchments include steep (> 25°) and humid catchments (> 2000mm yr-1). Furthermore, we found that an additional cause of negative grain size dependencies may emerge in large catchments with weak lithologies and long sediment travel distances (> 2300–7000 m, depending on lithology) where abrasion may lead to a grain size distribution that is not representative for the entire catchment. The results of this study can be used to evaluate whether catchment-average denudation rates are likely to be biased in particular catchments.
Samples from the Chilean Coastal Cordillera were processed in the Helmholtz Laboratory for the Geochemistry of the Earth Surface (HELGES). 10Be/9Be ratios were measured at the University of Cologne and normalized to the KN01-6-2 and KN01-5-3 standards. Denudation rates were calculated using a time-independent scaling scheme according to Lal (1991) and Stone (2002) (St scaling scheme) and the SLHL production rate of 4.01 at g-1 yr-1 as reported by Phillips et al. (2016)
The global compilation exists of studies that measured 10Be concentrations in different grain sizes from the same sample location. We only included river basins of <5000 km2 which measured 10Be concentrations in at least one sand-sized fraction <2 mm and at least one coarser fraction >2 mm. Catchment parameters have been recalculated using a 90-m SRTM DEM.
The data are presented in Excel and csv tables. Table S1 describes the characteristics of the samples catchments, Table S2 includes the grain size dependent 10Be-concentrations measured during this study and Table 3 the global compilation of grain size dependent 10Be-concentrations. All samples of this study (the Chilean Coastal Cordillera) are assigned with International Geo Sample Numbers (IGSN). The IGSN links are included in Table S2 and in the Related References Section on the DOI Landing Page. The data are described in detail in the data description file and in van Dongen et al. (2018) to which they are supplementary material to.
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;GFZ German Research Centre for Geosciences, Potsdam, Germany
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