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Lithium isotopic compositions of post-collisional mafic-ultramafic rocks from Dabieshan, China: Implications for recycling of deeply subducted continental crust
Tan, Dong-Bo1; Xiao, Yilin1,2; Sun, He3; Li, Wang-Ye1; Dai, Li-Qun1; Liu, Haiyang1,4; Tong, Fengtai1
2020
Source PublicationLITHOS
ISSN0024-4937
Volume352Pages:9
Corresponding AuthorXiao, Yilin(ylxiao@ustc.edu.cn)
AbstractLithium (Li) isotopes are potential tracers of processes related to crust-mantle interaction and recycled crustal materials. Previous studies have reported that Li isotopic compositions of island arc lavas are similar to those of fresh mid-ocean-ridge basalts (MORBs), although the former are expected to record high slab-derived delta Li-7 values caused by fluid metasomatism. However, it is unclear whether Li isotopic signatures of subducted continental crust were transported to mantle depths and preserved there. For clarification, we determined wholerock major and trace element, and Li isotopic compositions of post-collisional mafic-uitramafic rocks from northem Dabieshan, China. The analyzed samples have high MgO (up to 20.67 wt%) and low SiO2 (41.06-56.20 wt%) contents, and arc-like trace element distribution patterns, suggesting derivation by partial melting of fertile mantle sources. The samples have delta Li-7 values of -2.9 to +72%. (average = +2.7 parts per thousand, n = 42) and Li concentrations of 2.50 to 28.1 mu g/g (average = 9.20 mu g/g), both of which are beyond the relatively limited ranges of mantle values (delta Li-7= +2.9 to +4.3 parts per thousand, average = +3.5 +/- 1.0 parts per thousand, and Li = 1.20 +/- 0.10 mu g/g). Excluding possible effects of wall-rock assimilation and contamination, magmatic crystallization, and Li isotopic fractionation during subductionexhumation processes, the observed U isotopic heterogeneity is most likely related to the recycling of crustal materials. Based on a comparison with Li isotopic compositions of ultrahigh-pressure (UHP) metamorphic rocks from the Dabie-Sulu orogenic belt and terrestrial sediments, we suggest that the recycled continental crustal materials likely comprised gneisses, sediments, eclogites, and/or minor carbonate rocks (i.e., marbles). Our study demonstrates that Li isotopes may provide a novel means of tracing deeply subducted continental materials. (C) 2019 Elsevier B.V. All rights reserved.
KeywordLithium isotopes Post-collisional mafic-ultramafic rocks Recycled continental crust Subduction
DOI10.1016/j.lithos.2019.105327
Indexed BySCI
Language英语
Funding ProjectNatural Science Foundation of China[41673031] ; Strategic Priority Research Program (B) of CAS[XDB18020000] ; State Key Laboratory of Ore Deposit Geochemistry open funds[201608]
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000515201500011
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/165608
Collection中国科学院海洋研究所
Corresponding AuthorXiao, Yilin
Affiliation1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
2.CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China
3.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
4.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Tan, Dong-Bo,Xiao, Yilin,Sun, He,et al. Lithium isotopic compositions of post-collisional mafic-ultramafic rocks from Dabieshan, China: Implications for recycling of deeply subducted continental crust[J]. LITHOS,2020,352:9.
APA Tan, Dong-Bo.,Xiao, Yilin.,Sun, He.,Li, Wang-Ye.,Dai, Li-Qun.,...&Tong, Fengtai.(2020).Lithium isotopic compositions of post-collisional mafic-ultramafic rocks from Dabieshan, China: Implications for recycling of deeply subducted continental crust.LITHOS,352,9.
MLA Tan, Dong-Bo,et al."Lithium isotopic compositions of post-collisional mafic-ultramafic rocks from Dabieshan, China: Implications for recycling of deeply subducted continental crust".LITHOS 352(2020):9.
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