Knowledge Management System Of Institute of Oceanology, Chinese Academy of Sciences
| Sub-basin scale inhomogeneity of mantle in the South China Sea revealed by magnesium isotopes | |
| Zhong, Yuan1; Zhang, Guo-Liang1,2,3; Jin, Qi-Zhen4; Huang, Fang4; Wang, Xiao-Jun5; Xie, Lie-Wen6 | |
| 2021-04-15 | |
| 发表期刊 | SCIENCE BULLETIN
 |
| ISSN | 2095-9273 |
| 卷号 | 66期号:7页码:740-748 |
| 通讯作者 | Zhang, Guo-Liang(zhangguoliang@qdio.ac.cn) |
| 摘要 | The South China Sea (SCS) is the largest extensional basin in the western Pacific and was formed after rifting of the Euro-Asian continental margin. The nature of its underlying mantle remains enigmatic due to the lack of sampling of the seafloor's igneous crust. The International Ocean Discovery Program Expedition 349 cored seafloor basalts of the southwestern (Site U1433) and eastern (Site U1431) SCS sub-basins. The recovered basalt samples exhibit different source lithologies and geochemistries. The Mg isotopic compositions of seafloor basalts from these sites were investigated to elucidate the origin of this large-scale mantle inhomogeneity. Results indicate that the Site U1431 basalts have a mantle-like average delta Mg-26 value of -0.27 parts per thousand +/- 0.06 parts per thousand (2SD; n = 10). Together with inhomogeneous Sr-Nd-PbHf isotopic compositions, the Site U1433 basalts have an average delta Mg-26 value (-0.20%0 +/- 0.06%0; 2SD; n = 8) higher than those of the Site U1431 basalts and normal mantle. Their heavier Mg isotopic compositions and low Pb-206/Pb-204 ratios (similar to 17.7) indicate that the Site U1433 basalts were affected by the re-melting of detached continental-arc lithosphere in the sub-ridge mantle. The coupling of Mg and Sr-Nd isotopes provides robust evidence that the mantle-like delta Mg-26 values of the Site U1431 basalts resulted from mixing between detached continental arc lithosphere and the nearby Hainan plume, with respective supra- and sub-normal delta Mg-26 values. From the perspective of Mg isotope, the mantles of the southwestern and eastern sub-basins are compositionally inhomogeneous, with their mantle evolutionary histories being distinct. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. |
| 关键词 | Mantle heterogeneity Mid-ocean-ridge basalt Magnesium isotope Hainan plume South China Sea |
| DOI | 10.1016/j.scib.2020.12.016 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050101] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302] ; National Natural Science Foundation of China[91858206] ; National Natural Science Foundation of China[41876040] ; Laboratory for Marine Geology ; Qingdao Pilot National Laboratory for Marine Science and Technology[MGQNLM-TD201806] ; Taishan Scholars Program of Shandong Province[tsqn201909157] |
| WOS研究方向 | Science & Technology - Other Topics |
| WOS类目 | Multidisciplinary Sciences |
| WOS记录号 | WOS:000635050500018 |
| 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/337002/170252 |
| 专题 | 深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhang, Guo-Liang |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Natl Lab Marine Sci & Technol Qingdao, Lab Marine Geol, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 4.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China 5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 第一作者单位 | 深海极端环境与生命过程研究中心 |
| 通讯作者单位 | 深海极端环境与生命过程研究中心 |
| 推荐引用方式 GB/T 7714 | Zhong, Yuan,Zhang, Guo-Liang,Jin, Qi-Zhen,et al. Sub-basin scale inhomogeneity of mantle in the South China Sea revealed by magnesium isotopes[J]. SCIENCE BULLETIN,2021,66(7):740-748. |
| APA | Zhong, Yuan,Zhang, Guo-Liang,Jin, Qi-Zhen,Huang, Fang,Wang, Xiao-Jun,&Xie, Lie-Wen.(2021).Sub-basin scale inhomogeneity of mantle in the South China Sea revealed by magnesium isotopes.SCIENCE BULLETIN,66(7),740-748. |
| MLA | Zhong, Yuan,et al."Sub-basin scale inhomogeneity of mantle in the South China Sea revealed by magnesium isotopes".SCIENCE BULLETIN 66.7(2021):740-748. |
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