Sediment geochemistry data for the publication: “10Be/9Be ratios reveal marine authigenic clay formation”

Cite as:

Bernhardt, Anne; Oelze, Marcus; Bouchez, Julien; von Blanckenburg, Friedhelm; Mohtadi, Mahyar; Christl, Marcus; Wittmann-Oelze, Hella (2020): Sediment geochemistry data for the publication: “10Be/9Be ratios reveal marine authigenic clay formation”. GFZ Data Services. https://doi.org/10.5880/fidgeo.2020.009

Status

I N R E V I E W : Bernhardt, Anne; Oelze, Marcus; Bouchez, Julien; von Blanckenburg, Friedhelm; Mohtadi, Mahyar; Christl, Marcus; Wittmann-Oelze, Hella (2020): Sediment geochemistry data for the publication: “10Be/9Be ratios reveal marine authigenic clay formation”. GFZ Data Services. https://doi.org/10.5880/fidgeo.2020.009

Abstract

As reverse weathering has been shown to impact long-term changes in atmospheric CO2 levels, it is crucial to develop quantitative tools to reconstruct marine authigenic clay formation. We explored the potential of the beryllium (Be) isotope ratio (10Be/9Be) recorded in marine clay-sized sediment to track neoformation of authigenic clays. The power of such proxy relies on the orders-of-magnitude difference in 10Be/9Be ratios between continental Be and Be dissolved in seawater. On riverine and marine sediments collected along a Chilean margin transect we chemically extracted reactive phases and separated the clay-sized sediment fraction. We compare the riverine and marine 10Be/9Be ratio of this fraction. Moreover, we compare the elemental and mineralogical composition and the Nd and Sr-isotopic composition of these samples. 10Be/9Be ratios increase four-fold from riverine to marine sediment. We attribute this increase to the incorporation of Be high in 10Be/9Be from dissolved biogenic opal, which also serves as a Si-source for the precipitation of marine authigenic clays. 10Be/9Be ratios thus sensitively track reverse-weathering reactions forming marine authigenic clays.

Authors

Bernhardt, Anne;Institute of Geological Sciences, Freie Universitaet Berlin, Berlin, Germany;Freie Universitaet Berlin, Berlin, Germany
Oelze, Marcus;GFZ German Research Centre for Geosciences, Inorganic and Isotope Geochemistry, Potsdam, Germany;GFZ German Research Centre for Geosciences, Potsdam, Germany
Bouchez, Julien;Institut de Physique du Globe de Paris, 1 rue Jussieu, 75238 Paris 05, France
von Blanckenburg, Friedhelm;GFZ German Research Centre for Geosciences, Earth Surface Geochemistry, Potsdam, Germany;GFZ German Research Centre for Geosciences, Potsdam, Germany
Mohtadi, Mahyar;MARUM Center for Marine Environmental Sciences, Bremen University, Bremen, Germany
Christl, Marcus;Laboratory of Ion Beam Physics, Department of Physics, ETH Zurich, Zurich, Switzerland;ETH Zurich, Zurich, Switzerland
Wittmann-Oelze, Hella;GFZ German Research Centre for Geosciences, Earth Surface Geochemistry, Potsdam, Germany;GFZ German Research Centre for Geosciences, Potsdam, Germany

Contact

Bernhardt, Anne (Prof.); Institute of Geological Sciences, Freie Universitaet Berlin, Berlin, Germany; ➦

Funders

Deutsche Forschungsgemeinschaft: Meteoric 10Be as a tracer of terrestrial denudation in marine sediments: A feasibility study offshore central Chile (BE 5070/2-1)
Deutsche Forschungsgemeinschaft: Meteoric 10Be as a tracer of terrestrial denudation in marine sediments: A feasibility study offshore central Chile (WI 3874/2-1)

Keywords

reverse weathering, authigenic clay, beryllium, cosmogenic nuclide, 10Be, denudation, compound material > sedimentary material > chemical sedimentary material, compound material > sedimentary material > clastic sedimentary material, compound material > sedimentary material > sediment, compound material > sedimentary material > sediment > mud size sediment, geological process > sedimentation (geology)

GCMD Science Keywords

More Metadata

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