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Carbonated mantle domains at the base of the Earth's transition zone
Sun, Wei-dong1,2,3; Hawkesworth, Chris J.4,5; Yao, Chao6; Zhang, Chan-chan7,9; Huang, Rui-fang9; Liu, Xi8; Sun, Xin-lei9; Ireland, Trevor10; Song, Mao-shuang9; Ling, Ming-xing9; Ding, Xing9; Zhang, Zhao-feng9; Fan, Wei-ming3; Wu, Zhong-qing6
2018-02-05
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume478Pages:69-75
Corresponding AuthorSun, Wei-dong(weidongsun@gig.ac.cn) ; Hawkesworth, Chris J.(chris.hawkesworth@st-andrews.ac.uk) ; Wu, Zhong-qing(wuzq10@ustc.edu.cn)
AbstractThe oxygen fugacity of the upper mantle is 3-4 orders of magnitude higher than that of the lower mantle and this has been attributed to Fe2+ disproportionating into Fe3+ plus Fe-0 at pressures > 24 GPa. The upper mantle might therefore have been expected to have evolved to more oxidizing compositions through geological time, but it appears that the oxygen fugacity of the upper mantle has remained constant for the last 3.5 billion years. Thus, it indicates that the mantle has been actively buffered from the accumulation of Fe3+, and that this is linked to oxidation of diamond to carbonate coupled with reduction of Fe3+ to Fe2+. When subducted plates penetrate into the lower mantle, compensational upwelling transports bridgmanite into the transition zone, where it breaks down to ringwoodite and majorite, releasing the ferric iron. The system returns to equilibrium through oxidation of diamond. Early in Earth history, diamond may have been enriched at the base of the transition zone in the Magma Ocean, because it is denser than peridotite melts at depths shallower than 660 km, and it is more buoyant below. Ongoing oxidation of diamond forms carbonate, leading to relatively high carbonate concentrations in the source of ocean island basalts.
KeywordCarbon cycle Carbon concentration Elasticity First-principles calculations Earth mantle
DOI10.1016/j.chemgeo.2017.08.001
Indexed BySCI
Language英语
Funding ProjectNational Key R & D Program of China[2016YFC0600408] ; National Key R & D Program of China[CAS XDB18020000] ; National Key R & D Program of China[NSFC 91328204] ; State Key Development Program of Basic Research of China[2014CB845905] ; State Key Development Program of Basic Research of China[NSFC 41274087] ; State Key Development Program of Basic Research of China[41090371] ; Chinese Academy of Sciences President's International Fellowship[2015VEA003]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000422753100006
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/157814
Collection深海极端环境与生命过程研究中心
Corresponding AuthorSun, Wei-dong; Hawkesworth, Chris J.; Wu, Zhong-qing
Affiliation1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Univ St Andrews, Dept Earth & Environm Sci, North St, St Andrews KY16 9AL, Fife, Scotland
5.Univ Bristol, Sch Earth Sci, Wills Mem Bldg,Queens Rd, Bristol, Avon, England
6.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R China
7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
8.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
9.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
10.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
Recommended Citation
GB/T 7714
Sun, Wei-dong,Hawkesworth, Chris J.,Yao, Chao,et al. Carbonated mantle domains at the base of the Earth's transition zone[J]. CHEMICAL GEOLOGY,2018,478:69-75.
APA Sun, Wei-dong.,Hawkesworth, Chris J..,Yao, Chao.,Zhang, Chan-chan.,Huang, Rui-fang.,...&Wu, Zhong-qing.(2018).Carbonated mantle domains at the base of the Earth's transition zone.CHEMICAL GEOLOGY,478,69-75.
MLA Sun, Wei-dong,et al."Carbonated mantle domains at the base of the Earth's transition zone".CHEMICAL GEOLOGY 478(2018):69-75.
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