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| Main Authors: | , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2020
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.918725 |
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| _version_ | 1867169517738655744 |
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| author | Bernhardt, Anne Oelze, Marcus Bouchez, Julien von Blanckenburg, Friedhelm Mohtadi, Mahyar Christl, Marcus Wittmann, Hella |
| author_facet | Bernhardt, Anne Oelze, Marcus Bouchez, Julien von Blanckenburg, Friedhelm Mohtadi, Mahyar Christl, Marcus Wittmann, Hella |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_918725 |
| institution | PANGAEA |
| language | en |
| publishDate | 2020 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | 10Be/9Be ratios reveal marine authigenic clay formation Bernhardt, Anne Oelze, Marcus Bouchez, Julien von Blanckenburg, Friedhelm Mohtadi, Mahyar Christl, Marcus Wittmann, Hella 10Be; authigenic clay; Beryllium; Cosmogenic nuclide; denudation; reverse weathering 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. |
| title | 10Be/9Be ratios reveal marine authigenic clay formation |
| topic | 10Be; authigenic clay; Beryllium; Cosmogenic nuclide; denudation; reverse weathering |
| url | https://doi.org/10.1594/PANGAEA.918725 |