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  4. 岩石圈演化国家重点实验室
Nephelinites in eastern China originating from the mantle transition zone

文献类型：期刊论文

作者Zeng, Gang4; Chen, Li-Hui4; Hofmann, Albrecht W.5; Wang, Xiao-Jun4; Liu, Jian-Qiang1; Yu, Xun2; Xie, Lie-Wen3
刊名CHEMICAL GEOLOGY
出版日期2021-08-20
卷号576页码:11
ISSN号0009-2541
关键词Nephelinites Mantle transition zone Carbonate-bearing sediment Deep melting Liebermannite Eastern China
DOI10.1016/j.chemgeo.2021.120276
英文摘要Nephelinites, a highly alkaline volcanic rock type, have widely been thought to be formed in a shallow lithosphere previously impregnated with phlogopite and/or amphibole. Here we argue that nephelinites start melting at much greater depths than previously thought. Taking four Cenozoic nephelinitic volcanoes in eastern China as specific examples, we show that nephelinites have exceptionally low K/U and Ba/Th ratios, similar to most nephelinites worldwide, but their Nd-Sr-Hf isotopic compositions are inconsistent with a local lithospheric origin. They also have low, marine-carbonate-like 826Mg. We explain these features by partial melting of recycled, carbonate-bearing sediments in the mantle transition zone (MTZ; 410-660 km), where the high-pressure mineral liebermannite (KAlSi3O8, previously known as K-hollandite) is stable as a residual phase, preferentially retaining K, Ba, Rb and Pb relative to Th, U and light REE, thus releasing liquids with the characteristic trace-element patterns. Group-I kimberlites and oceanic HIMU basalts globally share the same peculiar geochemical anomalies characterizing the nephelinites, suggesting they may all have their roots in the MTZ. The nephelinites show correlations for Mg-Sr isotopes, 143Nd/144Nd-MgO, and 826Mg-Ba/Th ratios, suggesting binary mixing between melts. We therefore invoke a two-stage process to generate these nephelinites. In the first stage, an initial carbonated silicate melt is formed by melting of carbonate-bearing sediments in the MTZ. Subsequently, during the ascent, the initial melt reacts with the surrounding peridotite, thereby generating a reacted melt, which ultimately mixes with the initial, unreacted carbonated silicate melt. Accordingly, Cenozoic nephelinites in eastern China can be regarded as evolved melts from the MTZ.
WOS关键词CARBONATED ECLOGITE ; GEOCHEMICAL EVIDENCE ; MELTING EXPERIMENTS ; ISOTOPIC EVIDENCE ; ALKALINE BASALTS ; CENOZOIC BASALTS ; PHASE-RELATIONS ; SILICATE MELTS ; VOLCANIC-ROCKS ; STAGNANT SLAB
资助项目National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41672048] ; Fundamental Research Funds for the Central Universities[0206-14380114] ; State Key Laboratory for Mineral Deposits Research (Nanjing University)
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000659184900001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory for Mineral Deposits Research (Nanjing University) ; State Key Laboratory for Mineral Deposits Research (Nanjing University) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory for Mineral Deposits Research (Nanjing University) ; State Key Laboratory for Mineral Deposits Research (Nanjing University) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory for Mineral Deposits Research (Nanjing University) ; State Key Laboratory for Mineral Deposits Research (Nanjing University) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory for Mineral Deposits Research (Nanjing University) ; State Key Laboratory for Mineral Deposits Research (Nanjing University)
源URL[http://ir.iggcas.ac.cn/handle/132A11/102044]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Zeng, Gang; Chen, Li-Hui; Hofmann, Albrecht W.
作者单位1.Hohai Univ, Inst Marine Geol, Coll Oceanog, Nanjing 210098, Peoples R China
2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China
5.Max Planck Inst Chem, Abt Klimageochem, D-55128 Mainz, Germany
推荐引用方式
GB/T 7714		 Zeng, Gang,Chen, Li-Hui,Hofmann, Albrecht W.,et al. Nephelinites in eastern China originating from the mantle transition zone[J]. CHEMICAL GEOLOGY,2021,576:11.
APA Zeng, Gang.,Chen, Li-Hui.,Hofmann, Albrecht W..,Wang, Xiao-Jun.,Liu, Jian-Qiang.,...&Xie, Lie-Wen.(2021).Nephelinites in eastern China originating from the mantle transition zone.CHEMICAL GEOLOGY,576,11.
MLA Zeng, Gang,et al."Nephelinites in eastern China originating from the mantle transition zone".CHEMICAL GEOLOGY 576(2021):11.

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来源：地质与地球物理研究所

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