| New geochemical and Sr-Nd-Pb isotope evidence for FOZO and Azores plume components in the sources of DSDP Holes 559 and 561 MORBs | |
| Wei, Xun1,2; Zhang, Guo-Liang2,3; Castillo, Paterno R.4; Shi, Xue-Fa1,2; Yan, Quan-Shu1,2; Guan, Yi-Li1,2 | |
| 2020-12-20 | |
| 发表期刊 | CHEMICAL GEOLOGY
 |
| ISSN | 0009-2541 |
| 卷号 | 557页码:13 |
| 通讯作者 | Wei, Xun(xun.wei@fio.org.cn) |
| 摘要 | Enriched mid-ocean ridge basalts (E-MORBs) near hotspots are commonly ascribed to be products of mantle plume-ridge interaction, but the genesis of E-MORBs far from hotspots remains controversial. Here we report new major and trace element and Sr-Nd-Pb isotopic data for lavas from Holes 559 and 561 of Deep Sea Drilling Project (DSDP) Leg 82 that are located west of the Mid-Atlantic Ridge (MAR) midway between the Oceanographer and Hayes fracture zones (33-35 degrees N). Our data reveal that E-MORBs from Hole 559 have high (Sr-87/Sr-86)(i) (0.70292-0.70294) and (Pb-206/Pb-204)(i) (19.504-19.692) and low (Nd-143/Nd-144)(i) (0.51297-0.51299) values, similar to the mantle focal zone (FOZO) component, that could be partly coming from the New England mantle plume. We propose that the FOZO component could be widely distributed beneath the northern portion of MAR at -35 Ma. Hole 561 lavas contain both depleted (D-) and E-MORB. The D-MORBs have depleted Sr-Nd-Pb isotope compositions and were derived from the depleted asthenospheric mantle. Hole 561 E-MORBs have radiogenic (Sr-87/Sr-86)(i) (0.70337-0.70341), (Nd-143/Nd-144)(i) (0.51296-0.51297) and (Pb-206/Pb-204)(i) (19.463-19.525) values that are similar to the proposed common component in the mantle plume sources of lavas in all the Azores islands except for the eastern part of SAo Miguel. In addition, Hole 561 E-MORBs also display higher Th/La and Nb/La ratios than the most plume-influenced E-MORBs near the Azores hotspot and even the Azores lavas. These suggest that Hole 561 E-MORBs were derived from partial melting of a depleted mantle metasomatized by deep, low-degree melts of the common Azores plume component. We propose that variable amounts of such metasomatized mantle are widely distributed in the asthenospheric mantle beneath the MAR 33-35 degrees N ridge segment since similar to 19 Ma and their partial melting is also probably responsible for the generation of the modern MAR 33-35 degrees N E-MORBs. |
| 关键词 | Mid-ocean ridge basalts Mid-Atlantic Ridge E-MORB FOZO Radiogenic isotopes Azores plume |
| DOI | 10.1016/j.chemgeo.2020.119858 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13] ; Basic Scientific Fund for National Public Research Institutes of China[2019Q04] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory[GML2019ZD0202] ; National Natural Science Foundation of China[41576052] ; National Natural Science Foundation of China[U1606401] ; National Natural Science Foundation of China[41876040] ; Taishan Scholarship from Shandong Province[tsqn20161055] ; research grant of State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, CAS[SKLabIG-KF-16-04] ; China Postdoctoral Science Foundation[2015M580613] |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000589921700002 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/169196 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Wei, Xun |
| 作者单位 | 1.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Univ Calif San Diego, Scripps Inst Oceanog, 9500 Gilman Dr, La Jolla, CA 92093 USA |
| 推荐引用方式 GB/T 7714 | Wei, Xun,Zhang, Guo-Liang,Castillo, Paterno R.,et al. New geochemical and Sr-Nd-Pb isotope evidence for FOZO and Azores plume components in the sources of DSDP Holes 559 and 561 MORBs[J]. CHEMICAL GEOLOGY,2020,557:13. |
| APA | Wei, Xun,Zhang, Guo-Liang,Castillo, Paterno R.,Shi, Xue-Fa,Yan, Quan-Shu,&Guan, Yi-Li.(2020).New geochemical and Sr-Nd-Pb isotope evidence for FOZO and Azores plume components in the sources of DSDP Holes 559 and 561 MORBs.CHEMICAL GEOLOGY,557,13. |
| MLA | Wei, Xun,et al."New geochemical and Sr-Nd-Pb isotope evidence for FOZO and Azores plume components in the sources of DSDP Holes 559 and 561 MORBs".CHEMICAL GEOLOGY 557(2020):13. |
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