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The lithium isotopic composition and geochemical implication of ultrahigh-pressure marbles from the Dabie-Sulu orogen, China
Wan, Hongqiong1; Xiao, Yilin1,2; Sun, He1,3; Liu, Haiyang1,4; Wang, Yangyang1; Li, Dongyong1; Li, Wang-ye1
2020-06-15
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume195Pages:12
Corresponding AuthorXiao, Yilin(ylxiao@ustc.edu.cn)
AbstractSubduction zones are important in materials' cycling between Earth's surface and mantle. We report lithium (Li) contents and isotopic compositions (delta Li-7) of ultrahigh-pressure (UHP) marbles of the Dabie-Sulu orogen, with the aim of elucidating the geochemical behavior of Li isotopes during deep subduction of surficial carbonates and exploring the application of Li isotopes in tracing subduction and material-cycling. Pure UHP marbles (with delta Li-7 values up to 21.5 parts per thousand) show significantly heavier isotopic compositions than those of the mantle (2.0 parts per thousand-5.7 parts per thousand; average 3.7 parts per thousand), while impure marbles containing some silicates have delta Li-7 values as low as 1.3 parts per thousand. Weathering, fluid infiltration, and isotopic fractionation have negligible effects on the Li isotopic compositions of UHP marbles. Exhumed UHP marbles might be good samples to study those residual carbonates entering into the deep mantle. When subducted carbonates transport heavy Li isotopic signatures to mantle depths, they may result in local Li isotopic heterogeneity. As Li is a trace element and UHP marbles have significantly different delta Li-7 signatures to the mantle, Li isotopic geochemistry might be useful in tracing deep carbon cycling.
KeywordLithium isotopes Deep carbon cycling UHP marble Dabie-Sulu orogen Subduction
DOI10.1016/j.jseaes.2020.104376
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41673031] ; National Natural Science Foundation of China[41729001] ; National Natural Science Foundation of China[41603005] ; Strategic Priority Research Program (B) of Chinese Academy of Sciences[XDB18000000]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000536141200022
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/167597
Collection深海极端环境与生命过程研究中心
Corresponding AuthorXiao, Yilin
Affiliation1.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei 230026, Peoples R China
2.CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
3.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Wan, Hongqiong,Xiao, Yilin,Sun, He,et al. The lithium isotopic composition and geochemical implication of ultrahigh-pressure marbles from the Dabie-Sulu orogen, China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,195:12.
APA Wan, Hongqiong.,Xiao, Yilin.,Sun, He.,Liu, Haiyang.,Wang, Yangyang.,...&Li, Wang-ye.(2020).The lithium isotopic composition and geochemical implication of ultrahigh-pressure marbles from the Dabie-Sulu orogen, China.JOURNAL OF ASIAN EARTH SCIENCES,195,12.
MLA Wan, Hongqiong,et al."The lithium isotopic composition and geochemical implication of ultrahigh-pressure marbles from the Dabie-Sulu orogen, China".JOURNAL OF ASIAN EARTH SCIENCES 195(2020):12.
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