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| 论文编号: |
142 |
| 论文题目: |
An evaluation of benthic foraminiferal U/Ca and U/Mn proxies for deep ocean carbonate chemistry and redox conditions |
| 英文论文题目: |
An evaluation of benthic foraminiferal U/Ca and U/Mn proxies for deep ocean carbonate chemistry and redox conditions |
| 第一作者: |
Chen, PJ |
| 英文第一作者: |
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| 联系作者: |
Chen Pujiao |
| 英文联系作者: |
Chen Pujiao |
| 外单位作者单位: |
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| 英文外单位作者单位: |
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| 发表年度: |
2017 |
| 卷: |
18 |
| 期: |
2 |
| 页码: |
617-630 |
| 摘要: |
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| 英文摘要: |
The deep ocean is thought to have played a crucial role in modulating atmospheric CO2 changes, and thus reconstructions of deep ocean conditions can place important constraints on the past global carbon cycle. Some previous studies suggested that foraminiferal U/Ca could be used to infer seawater carbonate chemistry changes, but others showed complications from diagenesis and temperature. A recent downcore study suggested that foraminiferal U/Mn may be used for sedimentary redoxconditions, but no core-top work has been done to investigate factors affecting U/Mn. We investigate controlling factors on U/Ca and U/Mn in two benthic foraminiferal species from 120 global core-tops and three Atlantic sediment cores. Our core-top data reveal no significant correlation between core-top benthic U/Ca and carbonate system parameters. The lack of an influence of deep-water [CO22-] on U/Ca is further supported by our downcore results. Together, our data highlight complications to use benthic U/Ca for deep-water carbonate chemistry reconstructions. Although no correlation is found between core-top U/Mn and hydrographic data, high-resolution U/Mn and U/Ca in core TNO57-21 show similar patterns to authigenic U (aU) and vary in tandem with atmospheric CO2 on millennial timescales. Changes in U/Mn, U/Ca and aU in TNO57-21 may reflect postdepositional diagenesis linked to sedimentary oxygen, which is controlled by subantarctic surface productivity and ventilation of deep South Atlantic in the past. We suggest that benthic U/Mn and U/Ca may be used as auxiliary indicators for past sedimentary redox-conditions and along with other proxies could reflect deep-water oxygenation. |
| 刊物名称: |
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS |
| 英文刊物名称: |
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS |
| 论文全文: |
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| 英文论文全文: |
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| 全文链接: |
http://onlinelibrary.wiley.com/doi/10.1002/2016GC006730/abstract;jsessionid=C3D512B65F725EBAD0C18C851B2301A7.f03t01 |
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