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Recycling of sediment into the mantle source of K-rich mafic rocks: Sr-Nd-Hf-O isotopic evidence from the Fushui complex in the Qinling orogen

文献类型：期刊论文

作者Wang, Hao1,2; Wu, Yuan-Bao1; Li, Chao-Ran1; Zhao, Tian-Yu1; Qin, Zheng-Wei1; Zhu, Liu-Qin1; Gao, Shan1; Zheng, Jian-Ping1; Liu, Xiao-Ming3; Zhou, Lian1
刊名CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
出版日期2014-10-01
卷号168期号:4
关键词Zircon Hf-O isotope Geochemistry K-rich mafic rock Qinling orogen Subducted sediment
ISSN号0010-7999
DOI10.1007/s00410-014-1062-y
文献子类Article
英文摘要Potassium (K)-rich mafic rocks are viewed as being derived from partial melting of an enriched mantle source, but it is controversial about which processes cause the mantle enrichment. The Fushui intrusive complex is the largest early Paleozoic K-rich intrusive complex in the eastern Qinling orogen. Therefore, detailed studies on the Fushui complex can contribute not only to understanding of the petrogenesis of K-rich mafic rocks, but also to unraveling the Paleozoic evolution of the Qinling orogen. In this study, we provide an integrated investigation of in situ zircon U-Pb dating and Hf-O isotopes, in combination with whole-rock major and trace elements, as well as Sr-Nd-Hf isotopes, for the Fushui intrusive complex. In situ zircon secondary ion mass spectrometry (SIMS) / laser ablation induction coupled plasma mass spectrometry (LA-ICPMS) U-Pb dating reveals that different rock types of the Fushui complex have identical formation ages of 488-484 Ma. The Fushui complex belongs to the shoshonitic series, and is characterized by extreme large ion lithophile element (LILE, e.g., Ba, U, Th and Sr) and Pb enrichment and depletion of high field-strength elements (HFSEs, e.g. Nb, Ta, Zr, Hf, P and Ti). It shows high initial Sr isotopic ratios (0.7100-0.7151), negative whole-rock epsilon(Nd)(t) (-3.97 to -5.68) and negative to slight positive whole-rock (-2.24 to 2.38) and zircon (-2.85 to 0.34) epsilon(Hf)(t) values, as well as high zircon delta O-18 values (6.86 +/- 0.13 %). The Hf-Nd isotopic systems are decoupled with positive Delta epsilon(Hf) values (3.85-5.37). These geochemical features indicate that the mantle source has incorporated subducted zircon-barren oceanic sediments. A simple two-end-members mixing model constrains the amount of subducted sediments in the Fushui mantle source to 5-8 %. The Fushui complex originated from 1 to 6 % equilibrium melting of a phlogopite-bearing garnet lherzolite by non-modal melting. As shoshonitic magmas have been discovered in modern nascent arcs, we suggest that the generation of the Fushui complex was induced by the subduction of the Paleotethyan Ocean, when it jumped from the northern to the southern boundary of the North Qinling microcontinent.
WOS关键词U-PB AGE ; COLLECTOR ICP-MS ; NORTH CHINA ; TRACE-ELEMENT ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST ; CHEMICAL-COMPOSITION ; VOLCANIC-ROCKS ; LU-HF ; ZIRCON
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000343752400003
出版者SPRINGER
资助机构Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; Chinese Ministry of Science and Technology(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86726]  
专题中国科学院地质与地球物理研究所
通讯作者Wu, Yuan-Bao
作者单位1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Hao,Wu, Yuan-Bao,Li, Chao-Ran,et al. Recycling of sediment into the mantle source of K-rich mafic rocks: Sr-Nd-Hf-O isotopic evidence from the Fushui complex in the Qinling orogen[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2014,168(4).
APA Wang, Hao.,Wu, Yuan-Bao.,Li, Chao-Ran.,Zhao, Tian-Yu.,Qin, Zheng-Wei.,...&Yang, Sai-Hong.(2014).Recycling of sediment into the mantle source of K-rich mafic rocks: Sr-Nd-Hf-O isotopic evidence from the Fushui complex in the Qinling orogen.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,168(4).
MLA Wang, Hao,et al."Recycling of sediment into the mantle source of K-rich mafic rocks: Sr-Nd-Hf-O isotopic evidence from the Fushui complex in the Qinling orogen".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 168.4(2014).

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来源：地质与地球物理研究所

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