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Zinc isotope evidence for a large-scale carbonated mantle beneath eastern China

文献类型：期刊论文

作者Liu, Sheng-Ao1; Wang, Ze-Zhou1; Li, Shu-Guang1,2; Huang, Jian2; Yang, Wei3
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2016-06-15
卷号444页码:169-178
关键词zinc isotopes continental basalts eastern China carbonate cycling
DOI10.1016/j.epsl.2016.03.051
文献子类Article
英文摘要A large set of zinc (Zn) stable isotope data for continental basalts from eastern China were reported to investigate the application of Zn isotopes as a new tracer of deep carbonate cycling. All of the basalts with ages of <110 Ma have systematically heavy delta(66)zn (relative to JMC 3-0749L) ranging from 0.30 parts per thousand to 0.63 (n = 44) compared to the mantle (0.28 +/- 0.05 parts per thousand; 2sd) and >120 Ma basalts from eastern China (0.27 +/- 0.06 parts per thousand; 2sd). Given that Zn isotope fractionation during magmatic differentiation is limited (<= 0.1 parts per thousand), the elevated delta Zn-66 values reflect the involvement of isotopically heavy crustal materials (e.g., carbonates with an average delta Zn-66 of similar to 0.91 parts per thousand) in the mantle sources. SiO2 contents of the <110 Ma basalts negatively correlate with parameters that are sensitive to the degree of partial melting (e.g., Sm/Yb, Nb/Y, [Nb]) and with the concentration of Zn, which also behaves incompatibly during mantle melting. This is inconsistent with a volatile-poor peridotite source and instead suggests partial melting of carbonated peridotites which, at lower degree of melting, generates more Si-depleted (and more Ca-rich) melts. Zinc isotopic compositions are positively correlated with Sm/Yb, Nb/Y, [Nb] and [Zn], indicating that melts produced by lower degrees of melting have heavier Zn isotopic compositions. Carbonated peridotites have a lower solidus than volatile-poor peridotites and therefore at lower melting extents, contribute more to the melts, which will have heavier Zn isotopic compositions. Together with the positive relationships of delta Zn-66 with CaO and CaO/Al2O3, we propose that the heavy Zn isotopic compositions of the <110 Ma basalts were generated by incongruent partial melting of carbonated peridotites. Combined with previously reported Mg and Sr isotope data, we suggest that the large-scale Zn isotope anomaly indicates the widespread presence of recycled Mg (Zn)-rich carbonates in the mantle beneath eastern China since the Late Mesozoic. Since Zn is a trace element in the mantle and Zn isotopic compositions of marine carbonates and the mantle differ markedly, we highlight Zn isotopes as a new and useful tool of tracing deep carbonate cycling in the Earth's mantle. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词SOURCE-MASS-SPECTROMETRY ; OCEAN ISLAND BASALTS ; NORTH CHINA ; EARTHS MANTLE ; CENOZOIC BASALTS ; VOLCANIC-ROCKS ; TRACE-ELEMENT ; MAJOR-ELEMENT ; SOUTH CHINA ; ICP-MS
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000375818800016
资助机构National Key Project for Basic Research(2015CB452606) ; National Key Project for Basic Research(2015CB452606) ; National Natural Science Foundation of China(41473017 ; National Natural Science Foundation of China(41473017 ; Fundamental Research Funds(2-9-2014-068) ; Fundamental Research Funds(2-9-2014-068) ; 41230209 ; 41230209 ; 41573018) ; 41573018) ; National Key Project for Basic Research(2015CB452606) ; National Key Project for Basic Research(2015CB452606) ; National Natural Science Foundation of China(41473017 ; National Natural Science Foundation of China(41473017 ; Fundamental Research Funds(2-9-2014-068) ; Fundamental Research Funds(2-9-2014-068) ; 41230209 ; 41230209 ; 41573018) ; 41573018)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53503]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Sheng-Ao,Wang, Ze-Zhou,Li, Shu-Guang,et al. Zinc isotope evidence for a large-scale carbonated mantle beneath eastern China[J]. EARTH AND PLANETARY SCIENCE LETTERS,2016,444:169-178.
APA Liu, Sheng-Ao,Wang, Ze-Zhou,Li, Shu-Guang,Huang, Jian,&Yang, Wei.(2016).Zinc isotope evidence for a large-scale carbonated mantle beneath eastern China.EARTH AND PLANETARY SCIENCE LETTERS,444,169-178.
MLA Liu, Sheng-Ao,et al."Zinc isotope evidence for a large-scale carbonated mantle beneath eastern China".EARTH AND PLANETARY SCIENCE LETTERS 444(2016):169-178.

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来源：地质与地球物理研究所

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