Bernhardt, Anne; Oelze, Marcus; Bouchez, Julien; von Blanckenburg, Friedhelm; Mohtadi, Mahyar; Christl, Marcus; Wittmann, Hella (2020): 10Be/9Be ratios reveal marine authigenic clay formation [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.918725
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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.
Supplement to:
Bernhardt, Anne; Oelze, Marcus; Bouchez, Julien; von Blanckenburg, Friedhelm; Mohtadi, Mahyar; Christl, Marcus; Wittmann, Hella (2020): 10Be/9Be Ratios Reveal Marine Authigenic Clay Formation. Geophysical Research Letters, 47(4), https://doi.org/10.1029/2019GL086061
Further details:
Coverage:
Median Latitude: -37.164335 * Median Longitude: -73.645942 * South-bound Latitude: -37.540000 * West-bound Longitude: -74.514000 * North-bound Latitude: -36.810000 * East-bound Longitude: -73.170000
Date/Time Start: 2001-04-27T15:39:00 * Date/Time End: 2001-04-28T19:13:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
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4 datasets
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Datasets listed in this bundled publication
- Bernhardt, A; Oelze, M; Bouchez, J et al. (in review): XRD data of marine authigenic clay formation from different samples. https://doi.pangaea.de/10.1594/PANGAEA.918723
- Bernhardt, A; Oelze, M; Bouchez, J et al. (in review): Elemental concentrations of marine authigenic clay formation from different samples. https://doi.pangaea.de/10.1594/PANGAEA.918720
- Bernhardt, A; Oelze, M; Bouchez, J et al. (in review): Beryllium analysis of marine authigenic clay formation from different samples. https://doi.pangaea.de/10.1594/PANGAEA.918721
- Bernhardt, A; Oelze, M; Bouchez, J et al. (in review): Neodymium and Strontium analysis of marine authigenic clay formation from different samples. https://doi.pangaea.de/10.1594/PANGAEA.918722