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Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia
He, Ye1; Chen, Li-Hui1,2; Shi, Jin-Hua1; Zeng, Gang1; Wang, Xiao-Jun1; Xue, Xiao-Qiu1; Zhong, Yuan1; Erdmann, Saskia3; Xie, Lie-Wen4
2019-08-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume124Issue:8Pages:8043-8056
AbstractLow-delta Mg-26 basalts are commonly interpreted to represent melts derived from carbonated mantle sources. The mantle domain feeding low-delta Mg-26 Cenozoic basalts in eastern China overlaps the so-called Big Mantle Wedge (BMW) above the stagnant Pacific slab in the mantle transition zone, which indicates that the BMW is an important carbon reservoir generated by the slab. However, Mg isotopic composition in the nearby mantle beyond the BMW and, thus, the spatial extent of carbonated components in the mantle beneath eastern Asia have not yet been extensively characterized. Therefore, it remains largely unconstrained if additional or alternative carbon reservoirs exist. Here we carried out a geochemical study on Cenozoic Huihe nephelinites, which crop out similar to 500 km west of the present-day BMW. These rocks are characterized by negative K, Zr, Hf, and Ti anomalies, high Zr/Hf, Ca/Al ratios, and low delta Mg-26 values, which suggest that they are derived from a carbonated mantle source. The composition of the nephelinites demonstrates that low delta Mg-26 mantle components exist at significant distances from the present-day BMW, which highlights that in addition to the stagnant Pacific slab, other oceanic slab(s) also contribute(s) carbonate-bearing crustal materials to the mantle sources of Cenozoic volcanism in eastern Asia.
Keywordintraplate basalts Mg isotopes Big Mantle Wedge carbonate recycling
DOI10.1029/2018JB016857
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordNORTH CHINA CRATON ; CENOZOIC CONTINENTAL BASALTS ; PARTIAL MELTING EXPERIMENTS ; POTASSIC VOLCANIC-ROCKS ; NE CHINA ; TRACE-ELEMENT ; OCEANIC-CRUST ; GEOCHEMICAL EVIDENCE ; INTRAPLATE BASALTS ; CARBONATED MANTLE
Language英语
Funding ProjectNational Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41672049]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000491283500027
PublisherAMER GEOPHYSICAL UNION
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95769
Collection岩石圈演化国家重点实验室
Corresponding AuthorChen, Li-Hui
Affiliation1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing, Jiangsu, Peoples R China
2.CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
3.Univ Orleans, CNRS, INSU ISTO BRGM, UMR 7327, Orleans, France
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Recommended Citation
GB/T 7714
He, Ye,Chen, Li-Hui,Shi, Jin-Hua,et al. Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(8):8043-8056.
APA He, Ye.,Chen, Li-Hui.,Shi, Jin-Hua.,Zeng, Gang.,Wang, Xiao-Jun.,...&Xie, Lie-Wen.(2019).Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(8),8043-8056.
MLA He, Ye,et al."Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.8(2019):8043-8056.
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