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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
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume18Issue:2Pages:617-630
SubtypeArticle
AbstractThe 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 HeadingsScience & Technology ; Physical Sciences
DOI10.1002/2016GC006730
WOS KeywordLAST GLACIAL MAXIMUM ; RICH CONTAMINANT PHASES ; NORTH-ATLANTIC OCEAN ; ATMOSPHERIC CO2 ; PLANKTONIC-FORAMINIFERA ; SOUTHERN-OCEAN ; BORON ISOTOPE ; ICE-AGE ; MG/CA PALEOTHERMOMETRY ; INTERGLACIAL CHANGES
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000396757200011
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5513
Collection加速器质谱中心
Affiliation1.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
Recommended Citation
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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