The role of recycled oceanic crust in the alkaline basalts: Evidence from Zn isotopic compositions of alkaline basalts from the Madeira hotspot (eastern North Atlantic)
文献类型：期刊论文
| 作者 | Liao, Renqiang2 ; Zhu, Hongli2; Geldmacher, Jorg1; Li, Congying2; Liu, He2; Sun, Weidong2,3,4
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| 刊名 | CHEMICAL GEOLOGY
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| 出版日期 | 2023-09-30 |
| 卷号 | 635页码:10 |
| ISSN号 | 0009-2541 |
| 关键词 | Zinc isotopes Alkaline oceanic island basalts Madeira hotspot Recycled oceanic crust Mantle heterogeneity |
| DOI | 10.1016/j.chemgeo.2023.121606 |
| 通讯作者 | Zhu, Hongli(zhuhongli@qdio.ac.cn) |
| 英文摘要 | Plate tectonic processes introduce oceanic crust (as eclogite) into the sources of oceanic island basalts (OIB). The fate of this recycled material in the deep mantle is still poorly understood. Here we present a systematic study of Zn isotopes on well-characterized alkaline basalts (<5 Ma) from the Madeira Islands in the eastern North Atlantic. Our analyses show that the delta Zn-66 values of alkaline basalts range from 0.25 parts per thousand to 0.34 parts per thousand, with an average of 0.30 & PLUSMN; 0.05 parts per thousand (2SD, N = 15), which is similar to the average of mid-ocean ridge basalts (MORB) (0.28 +/- 0.03%0, 2SD), and similar to 0.14 parts per thousand higher than that of the asthenospheric mantle (0.16 +/- 0.06 parts per thousand, 2SD). However, these alkaline basalts have higher Zn/Fe ratios (up to 14.20) than MORB (generally less than 12). Model calculations show that the partial melting of mantle peridotite cannot simultaneously produce the observed MORBlike delta Zn-66 values and trace element ratios. After excluding the effects of post-eruption alteration, crystal fractionation, and the assimilation of crustal materials during magma upwelling on Zn isotopic compositions of the studied samples, we suggest that the MORB-like delta Zn-66 values reflect the mixing of peridotite melt and eclogite/ pyroxenite-derived melt in the magma source of the Madeira hotspot. This is supported by trace element ratios and radiogenic isotopes, such as high Zn/Fe and Dy/Yb ratios and 206Pb/204Pb values. Our new data provide independent evidence in support of the important role of recycled oceanic crust in the source and generation of alkaline OIBs, and also highlight that such sources are not ubiquitously carbonated. |
| WOS关键词 | LATE CENOZOIC BASALTS ; MANTLE SOURCE ; ZINC ; FRACTIONATION ; SYSTEMATICS ; COPPER ; INSIGHTS ; CONSTRAINTS ; SUBDUCTION ; BEHAVIOR |
| 资助项目 | grants of Youth Innovation Promotion Association, Chinese Academy of Sciences[2020212] ; grants of Youth Innovation Promotion Association, Chinese Academy of Sciences[2022207] ; Shandong Provincial Natural Science Foundation[ZR2021QD098] ; National Natural Science Foundation of China[42206057] ; National Natural Science Foundation of China[42073011] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020303] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001033439100001 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/182598]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhu, Hongli |
| 作者单位 | 1.GEOMAR Helmholtz Ctr Ocean Res Kiel, D-24148 Kiel, Germany 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Deep Sea Multidisciplinary Res Ctr, Laoshan Lab, Qingdao 266237, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liao, Renqiang,Zhu, Hongli,Geldmacher, Jorg,et al. The role of recycled oceanic crust in the alkaline basalts: Evidence from Zn isotopic compositions of alkaline basalts from the Madeira hotspot (eastern North Atlantic)[J]. CHEMICAL GEOLOGY,2023,635:10. |
| APA | Liao, Renqiang,Zhu, Hongli,Geldmacher, Jorg,Li, Congying,Liu, He,&Sun, Weidong.(2023).The role of recycled oceanic crust in the alkaline basalts: Evidence from Zn isotopic compositions of alkaline basalts from the Madeira hotspot (eastern North Atlantic).CHEMICAL GEOLOGY,635,10. |
| MLA | Liao, Renqiang,et al."The role of recycled oceanic crust in the alkaline basalts: Evidence from Zn isotopic compositions of alkaline basalts from the Madeira hotspot (eastern North Atlantic)".CHEMICAL GEOLOGY 635(2023):10. |
入库方式： OAI收割
来源：海洋研究所
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