| An evaluation of benthic foraminiferal U/Ca and U/Mn proxies for deep ocean carbonate chemistry and redox conditions | |
| Chen, Pujiao1,2; Yu, Jimin1; Jin, Zhangdong3 | |
| 2017-02-01 | |
| 发表期刊 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 卷号 | 18期号:2页码:617-630 |
| 文章类型 | Article |
| 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| DOI | 10.1002/2016GC006730 |
| 关键词[WOS] | LAST GLACIAL MAXIMUM ; RICH CONTAMINANT PHASES ; NORTH-ATLANTIC OCEAN ; ATMOSPHERIC CO2 ; PLANKTONIC-FORAMINIFERA ; SOUTHERN-OCEAN ; BORON ISOTOPE ; ICE-AGE ; MG/CA PALEOTHERMOMETRY ; INTERGLACIAL CHANGES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000396757200011 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ieecas.cn/handle/361006/5513 |
| 专题 | 加速器质谱中心 |
| 作者单位 | 1.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia 2.East China Normal Univ, Sch Geog Sci, Shanghai, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Pujiao,Yu, Jimin,Jin, Zhangdong. An evaluation of benthic foraminiferal U/Ca and U/Mn proxies for deep ocean carbonate chemistry and redox conditions[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2017,18(2):617-630. |
| APA | Chen, Pujiao,Yu, Jimin,&Jin, Zhangdong.(2017).An evaluation of benthic foraminiferal U/Ca and U/Mn proxies for deep ocean carbonate chemistry and redox conditions.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,18(2),617-630. |
| MLA | Chen, Pujiao,et al."An evaluation of benthic foraminiferal U/Ca and U/Mn proxies for deep ocean carbonate chemistry and redox conditions".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 18.2(2017):617-630. |
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