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Across-arc variations in Mo isotopes and implications for subducted oceanic crust in the source of back-arc basin volcanic rocks

文献类型：期刊论文

作者Li, Xiaohui1,2,3; Yan, Quanshu4; Zeng, Zhigang2,3; Fan, Jingjing5; Li, Sanzhong1,3; Li, Jie5,6; Yang, Huixin2; Wang, Xiaoyuan2,3
刊名GEOLOGY
出版日期2021-10-01
卷号49期号:10页码:1165-1170
ISSN号0091-7613
DOI10.1130/G48754.1
通讯作者Li, Xiaohui(xiaohuili@ouc.edu.cn) ; Yan, Quanshu(qsyan@fio.org.cn) ; Zeng, Zhigang(zgzeng@qdio.ac.cn)
英文摘要Molybdenum (Mo) isotope ratios provide a potential means of tracing material recycling involved in subduction zone processes. However, the geochemical behavior of Mo in subducted oceanic crust remains enigmatic. We analyzed Mo isotope ratios of arc and back-arc basin lavas from the Mariana subduction zone (western Pacific Ocean), combining newly obtained element and Sr-Nd-Pb-Li isotope data to investigate subduction zone geochemical processes involving Mo. The Mo isotope ratios (delta Mo-98/95(NIST3134); U.S. National Institute of Standards and Technology [NIST] Mo standard) of the volcanic rocks showed clear across-arc variations, decreasing with increasing depth to the Wadati-Benioff zone. The high delta Mo-98/95 values in the Mariana Islands (-0.18%0 to +0.38%0) correspond to high Sr-87/Sr-86, low Nd-143/Nd-144, and radiogenic Pb isotope ratios, suggesting that altered upper oceanic crust played an important role in the magma source. The low delta Mo-98/95 values in the Central Mariana Trough (-0.65%0 to -0.17%0) with mantle-like Sr-Nd-Pb but slightly low delta Li-7 values provide direct evidence for the contribution of deep recycled oceanic crust to the magma source of the back-arc basin lavas. The isotopically light Mo magmas originated by partial melting of a residual subducted slab (eclogite) after high degrees of dehydration and then penetrated into the back-arc mantle. This interpretation provides a new perspective with which to investigate the deep recycling of subducted oceanic lithosphere and associated magma petrogenesis.
资助项目National Natural Science Foundation of China (NSFC)[42006052] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB42020402] ; NSFC[91958214] ; NSFC[91958213] ; China Postdoctoral Science Foundation[2020M672018] ; NSFC for the 13th Five Year Plan of the China Ocean Mineral Resources Research and Development Association (COMRA)[DY135-G2-1-02] ; Taishan Scholarship from Shandong Province ; National Key Basic Research Program of China[2013CB429700]
WOS研究方向Geology
语种英语
WOS记录号WOS:000705084600003
出版者GEOLOGICAL SOC AMER, INC
源URL[http://ir.qdio.ac.cn/handle/337002/176621]  
专题海洋研究所_海洋地质与环境重点实验室
通讯作者Li, Xiaohui; Yan, Quanshu; Zeng, Zhigang
作者单位1.Ocean Univ China, Coll Marine Geosci, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Submarine Geosci & Prospecting Tech,Minis, Qingdao 266100, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
4.Minist Nat Resources, Key Lab Marine Geol & Metallogeny, Inst Oceanog 1, Qingdao 266061, Peoples R China
5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
6.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xiaohui,Yan, Quanshu,Zeng, Zhigang,et al. Across-arc variations in Mo isotopes and implications for subducted oceanic crust in the source of back-arc basin volcanic rocks[J]. GEOLOGY,2021,49(10):1165-1170.
APA Li, Xiaohui.,Yan, Quanshu.,Zeng, Zhigang.,Fan, Jingjing.,Li, Sanzhong.,...&Wang, Xiaoyuan.(2021).Across-arc variations in Mo isotopes and implications for subducted oceanic crust in the source of back-arc basin volcanic rocks.GEOLOGY,49(10),1165-1170.
MLA Li, Xiaohui,et al."Across-arc variations in Mo isotopes and implications for subducted oceanic crust in the source of back-arc basin volcanic rocks".GEOLOGY 49.10(2021):1165-1170.

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来源：海洋研究所

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