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Formation age and metasomatism of the sub-continental lithospheric mantle beneath southeast China: Sr-Nd-Hf-Os isotopes of Mingxi mantle xenoliths

文献类型：期刊论文

作者Liu, Chuan-Zhou1,2; Zhang, Chang1; Liu, Zhi-Chao1,3; Sun, Jing1; Chu, Zhu-Yin1; Qiu, Zhi-Li3; Wu, Fu-Yuan1,2
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2017-09-01
卷号145页码:591-604
关键词Mantle xenoliths SCLM Sr-Nd-Hf isotopes Re-Os isotopes Southeast China Mingxi
ISSN号1367-9120
DOI10.1016/j.jseaes.2017.06.013
文献子类Article
英文摘要This study presents comprehensive geochemical data of spinel-and gamet-facies mantle peridotites entrained in the Cenozoic basalts from Mingxi, southeastern China. Whole rock major elements suggest that most Mingxi peridotites have been subjected to polybaric melting, i.e., < 15% for the lherzolites and similar to 15-25% for the harzburgites. Presence of amphibole/phlogopite in a few samples indicates the local occurrence of modal metasomatism, whereas mineral chemistry suggests that most Mingxi peridotites have experienced cryptic metasomatism by various agents, including carbonatitic melts, silicate melts and Fe-Ti-rich melts. Clinopyroxenes in the harzburgites have Sr-87/Sr-86 and Nd-143/Nd-144 ratios of 0.703121-0.704557 and 0.512793-0.513106 (epsilon(Nd) of +3 similar to + 9), which are more enriched than those in the lherzolites (Sr-87/Sr-86 of 0.702238-0.703898, Nd-143/Nd-144 of 0.512918-0.514763, and epsilon(Nd) of +5 similar to +42). The Hf-176/Hf-177 ratios of clinopyroxenes in harzburgites are comparable to the lherzolites, i.e., 0.282888-0.285485 (epsilon(Hf) of +4 similar to +96) and 0.283259-0.285791 (epsilon(Hf) of +15 similar to +106), respectively. Neither Sm-Nd nor Lu-Hf isotopes yielded meaningful isochron ages owing to the metasomatic overprinting. Clinopyroxenes in two samples are characterized by extremely radiogenic Hf-176/Hf-177 ratios in association with less extreme Nd-143/Nd-144 ratios, resulting in a strong Nd-Hf decoupling relative to the mantle array. Whole rock Os isotopes of the Mingxi peridotites range from 0.11685 to 0.13035, yielding Re depletion (T-RD) ages no older than 1.79 Ga, and do not show a correlation with Re/Os ratios. In contrast, they display a roughly positive correlation with bulk rock Al2O3 contents, which can be explained by mixing of ancient mantle with fertile convecting upper mantle. Therefore, we suggest that the SCLM beneath Mingxi is juvenile and recently accreted from the convective mantle. The Mingxi peridotites with old Os ages reflect the ancient mantle in the convecting upper mantle, and have no relationship with the overlying old crust with ages of the Late Paleoproterozoic. The newly formed SCLM beneath Mingxi has been metasomatized by fluids/melts released from the subducted paleo-Pacific Ocean, which was initiated since the Mid-Permian.
WOS关键词OCEANIC UPPER-MANTLE ; RE-OS ; PERIDOTITE XENOLITHS ; ABYSSAL PERIDOTITES ; EASTERN CHINA ; TRACE-ELEMENT ; SE CHINA ; CARBONATITE METASOMATISM ; CATHAYSIA BLOCK ; U-PB
WOS研究方向Geology
语种英语
WOS记录号WOS:000411533600019
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构NSFC(41673038 ; NSFC(41673038 ; CAS(QYZDB-SSW-DQC032) ; CAS(QYZDB-SSW-DQC032) ; 41521062) ; 41521062) ; NSFC(41673038 ; NSFC(41673038 ; CAS(QYZDB-SSW-DQC032) ; CAS(QYZDB-SSW-DQC032) ; 41521062) ; 41521062) ; NSFC(41673038 ; NSFC(41673038 ; CAS(QYZDB-SSW-DQC032) ; CAS(QYZDB-SSW-DQC032) ; 41521062) ; 41521062) ; NSFC(41673038 ; NSFC(41673038 ; CAS(QYZDB-SSW-DQC032) ; CAS(QYZDB-SSW-DQC032) ; 41521062) ; 41521062)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61952]  
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Liu, Chuan-Zhou
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Sun Yat Sen Univ, Dept Earth Sci, Guangzhou 510275, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Chuan-Zhou,Zhang, Chang,Liu, Zhi-Chao,et al. Formation age and metasomatism of the sub-continental lithospheric mantle beneath southeast China: Sr-Nd-Hf-Os isotopes of Mingxi mantle xenoliths[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,145:591-604.
APA Liu, Chuan-Zhou.,Zhang, Chang.,Liu, Zhi-Chao.,Sun, Jing.,Chu, Zhu-Yin.,...&Wu, Fu-Yuan.(2017).Formation age and metasomatism of the sub-continental lithospheric mantle beneath southeast China: Sr-Nd-Hf-Os isotopes of Mingxi mantle xenoliths.JOURNAL OF ASIAN EARTH SCIENCES,145,591-604.
MLA Liu, Chuan-Zhou,et al."Formation age and metasomatism of the sub-continental lithospheric mantle beneath southeast China: Sr-Nd-Hf-Os isotopes of Mingxi mantle xenoliths".JOURNAL OF ASIAN EARTH SCIENCES 145(2017):591-604.

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来源：地质与地球物理研究所

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