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Evidence for rutile-bearing eclogite in the mantle sources of the Cenozoic Zhejiang basalts, eastern China

文献类型：期刊论文

作者Yu, Xun1; Zeng, Gang2; Chen, Li-Hui2; Wang, Xiao-Jun2; Liu, Jian-Qiang3; Xie, Lie-Wen4; Yang, Tao2
刊名LITHOS
出版日期2019
卷号324页码:152-164
关键词Rutile Eclogite Carbonated peridotite Pacific oceanic crust Intraplate basalts Eastern China
ISSN号0024-4937
DOI10.1016/j.lithos.2018.11.003
英文摘要Cenozoic intraplate basalts are widely distributed along the southeastern margin of Eurasia. Both carbonated and eclogitic/pyroxenitic components, which are considered related to oceanic crust recycling, have been identified in the mantle source of these basalts. However, the origin of the recycled oceanic crust and the genetic relationship between different source lithologies remain unclear. Here, we assess the source lithologies of late Miocene intraplate basalts from Ninghai, Zhejiang Province, eastern China, using new elemental and Sr-Nd-Hf isotopic compositional data. These data are also compared with those of the nearby Xinchang-Shengzhou flood basalts and other Cenozoic basalts in Zhejiang Province. New Mg isotopic compositions of the Ninghai and Xinchang-Shengzhou basalts are used to evaluate the potential influence of carbonated components during their formation. Nephelinites and basanites from Ninghai and Xinchang-Shengzhou have negative Ti and Hf anomalies, superchondritic Ca/Al ratios, and light Mg isotopic compositions (delta Mg-26 = -0.35 to -0.38 parts per thousand), indicating a carbonated component in the mantle source. By comparison, other Ninghai basalts have positive Ti and Nb anomalies, with Sm/Yb and Lu/Hf ratios that generally correlate with Ti/Ti* values. These observations indicate that rutile-bearing eclogite should also play an important role in the formation of the Ninghai basalts, in addition to mantle peridotite. The terrestrial mantle-likeMg-isotopic compositions of the Ninghai basalts further support their formation by high-degree partial melting of such mixed source. In the plots of Sr-Nd isotopes and Ti/Ti*, the nephelinites and basanites from Ninghai and Xinchang-Shengzhou show different trends compared with other Ninghai basalts, and the carbonated component in the mantle source of the former has similar and depleted Sr-Nd isotopes to the rutile-bearing eclogite source of the latter. Additionally, samples of these basalts show negative Delta epsilon(Hf) values similar to those of Pacific MORB. Subducted Pacific oceanic crust is therefore considered an appropriate source for both the carbonated and rutile-bearing eclogitic components. The Ninghai basalts provide an important insight into oceanic crust recycling in eastern China, with data indicating a genetic relationship between the carbonated component and rutile-bearing eclogite in the mantle sources of intraplate basalts. (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词RECYCLED OCEANIC-CRUST ; TRACE-ELEMENT ; CONTINENTAL BASALTS ; CARBONATED MANTLE ; SOUTH CHINA ; 3 GPA ; PARTITION-COEFFICIENTS ; ISOTOPIC COMPOSITION ; GEOCHEMICAL EVIDENCE ; ALKALINE BASALTS
资助项目National Natural Science Foundation of China[41672048] ; National Natural Science Foundation of China[41430208] ; National Natural Science Foundation of China[41530964] ; Shanghai Sailing Program[17YF1420300] ; China Postdoctoral Science Foundation[2017M621525]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000457819800011
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Shanghai Sailing Program ; Shanghai Sailing Program ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Shanghai Sailing Program ; Shanghai Sailing Program ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Shanghai Sailing Program ; Shanghai Sailing Program ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Shanghai Sailing Program ; Shanghai Sailing Program ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/90511]  
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
作者单位1.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
2.Nanjing Univ, State Key Lab Mineral Deposits Res, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China
3.Hohai Univ, Coll Oceanog, Inst Marine Geol, Nanjing 210098, Jiangsu, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Yu, Xun,Zeng, Gang,Chen, Li-Hui,et al. Evidence for rutile-bearing eclogite in the mantle sources of the Cenozoic Zhejiang basalts, eastern China[J]. LITHOS,2019,324:152-164.
APA Yu, Xun.,Zeng, Gang.,Chen, Li-Hui.,Wang, Xiao-Jun.,Liu, Jian-Qiang.,...&Yang, Tao.(2019).Evidence for rutile-bearing eclogite in the mantle sources of the Cenozoic Zhejiang basalts, eastern China.LITHOS,324,152-164.
MLA Yu, Xun,et al."Evidence for rutile-bearing eclogite in the mantle sources of the Cenozoic Zhejiang basalts, eastern China".LITHOS 324(2019):152-164.

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来源：地质与地球物理研究所

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