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A nephelinitic component with unusual delta(56) Fe in Cenozoic basalts from eastern China and its implications for deep oxygen cycle
He, Yongsheng1; Meng, Xunan1; Ke, Shan1; Wu, Hongjie1; Zhu, Chuanwei1; Teng, Fang-Zhen2; Hoefs, Jochen3; Huang, Jian4; Yang, Wei5; Xu, Lijuan1; Hou, Zhenhui4; Ren, Zhong-Yuan6; Li, Shuguang1,4
2019-04-15
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
Volume512Pages:175-183
AbstractCycling of elements with multiple valences (e.g., Fe, C, and S) through subduction and magmatism may dictate the redox evolution of the deep mantle and atmosphere. To investigate the potential of Fe isotopes as a tracer of such cycles, here we report Fe isotopic compositions of thirty-seven Cenozoic basalts from eastern China. A nephelinitic melt component with delta(56) Fe up to 0.29 has been identified, which cannot be explained by weathering, alteration, magma differentiation, or chemical diffusion. Its low Fe/Mn similar to 58, relatively low TiO2 and high Na2O + K2O argue against a significant contribution of pyroxenite melting. Instead, the heavy Fe component requires enhanced isotope fractionation during partial melting of a peridotitic source with Fe-3 +/Sigma Fe >= 0.15. Low Ba/Th similar to 50 and depleted Sr-87/Sr-86(i) and epsilon(Nd )(t) suggest that the source was insignificantly affected by hydrous fluids and recycled terrigenous sediments. The heavy Fe component is known to be unique in its low delta(26) Mg and high delta(66) Zn and indicates hybridization by recycled carbonates. The source Fe-3+/Sigma Fe was most likely enhanced at cost of reduction of recycled carbonates to diamonds in a mantle depth >= 300 km. The origin of the heavy Fe component illustrates a pathway with net transportation of oxidizer back to Earth's surface: CO2 (in carbonates) -> C (as diamond frozen in the deep mantle) + O-2 (ferric Fe being scavenged by melt extraction). Secular cooling of global subduction zones may have stepwisely increased the efficiency of this carbon driven deep oxygen cycle in the past, providing an alternative explanation for the rise of atmospheric O-2. (C) 2019 Elsevier B.V. All rights reserved.
Keywordiron isotopes oxidized peridotitic source deep carbon freezing deep oxygen cycle atmospheric oxygenation
DOI10.1016/j.epsl.2019.02.009
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources
WOS KeywordIRON ISOTOPE FRACTIONATION ; MAGMATIC DIFFERENTIATION ; OXIDATION-STATE ; MANTLE ; REDOX ; WATER ; GEOCHEMISTRY ; TRANSITION ; PERIDOTITE ; EVOLUTION
Language英语
Funding ProjectNational Natural Science Foundation of China[41730214] ; National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41473016] ; National Natural Science Foundation of China[41230209] ; National Key R&D Program of China[2016YFC0600408] ; State Key Laboratory of Geological Processes and Mineral Resources
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000462106300017
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/91098
Collection岩石圈演化国家重点实验室
Corresponding AuthorHe, Yongsheng; Li, Shuguang
Affiliation1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
3.Univ Gottingen, Dept Geosci, Goldschmidtstr 1, D-37077 Gottingen, Germany
4.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
6.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
He, Yongsheng,Meng, Xunan,Ke, Shan,et al. A nephelinitic component with unusual delta(56) Fe in Cenozoic basalts from eastern China and its implications for deep oxygen cycle[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,512:175-183.
APA He, Yongsheng.,Meng, Xunan.,Ke, Shan.,Wu, Hongjie.,Zhu, Chuanwei.,...&Li, Shuguang.(2019).A nephelinitic component with unusual delta(56) Fe in Cenozoic basalts from eastern China and its implications for deep oxygen cycle.EARTH AND PLANETARY SCIENCE LETTERS,512,175-183.
MLA He, Yongsheng,et al."A nephelinitic component with unusual delta(56) Fe in Cenozoic basalts from eastern China and its implications for deep oxygen cycle".EARTH AND PLANETARY SCIENCE LETTERS 512(2019):175-183.
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