| Geochemical nature of sub-ridge mantle and opening dynamics of the South China | |
| Zhang, Guo-Liang1,2,3; Luo, Qing1,2; Zhao, Jian4; Jackson, Matthew G.5; Guo, Li-Shuang6; Zhong, Li-Feng7 | |
| 2018-05-01 | |
| Source Publication | EARTH AND PLANETARY SCIENCE LETTERS
 |
| ISSN | 0012-821X |
| Volume | 489Pages:145-155 |
| Corresponding Author | Zhang, Guo-Liang(zhangguoliang@qdio.ac.cn) |
| Abstract | The Indian-type mantle (i.e., above the north hemisphere reference line on the plot of Pb-208/Pb-204 vs. (206)pb/(204)pb) has been considered as a "Southern Hemisphere" geochemical signature, whose origin remains enigmatic. The South China Sea is an extensional basin formed after rifting of the Euro-Asia continent in the Northern Hemisphere, however, the geochemical nature of the igneous crust remains unexplored. For the first time, IODP Expedition 349 has recovered seafloor basalts covered by the thick sediments in the Southwest sub-basin (Sites U1433 and U1434) and the East sub-basin (Site U1431). The Southwest sub-basin consists of enriched (E)-MORB type basalts, and the East sub-basin consists of both normal (N)-MORB-type and E-MORB-type basalts based on trace element compositions. The basalts of the two sub-basins are Indian-type MORBs based on Sr-Nd-Pb-Hf isotope compositions, and the Southwest sub-basin basalts show isotopic compositions (i.e., Pb-206/Pb-204 of 17.59-17.89) distinctly different from the East sub-basin (i.e., Pb-206/Pb-204 of 18.38-18.57), suggesting a sub-basin scale mantle compositional heterogeneity and different histories of mantle compositional evolution. Two different enriched mantle end-members (EMI and EM2) are responsible for the genesis of the Indian-type mantle in the South China Sea. We have modeled the influences of Hainan mantle plume and lower continental crust based on Sr-Nd-Pb-Hf isotope compositions. The results indicate that the influence of Hainan plume can explain the elevated Pb-206/Pb-204 of the East sub-basin basalts, and the recycling of lower continental crust can explain the low Pb-206/Pb-204 of the Southwest sub-basin basalts. Based on the strong geochemical imprints of Hainan plume in the ridge magmatism, we propose that the Hainan plume might have promoted the opening of the South China Sea, during which the Hainan plume contributed enriched component to the sub-ridge mantle and caused thermal erosion and return of lower continental crust to the convective mantle. These results imply an in situ origin of the Indian-type mantle that can help understand the genesis of the "Southern Hemisphere" geochemical anomaly in the Northern Hemispheric extensional basin. (C) 2018 Elsevier B.V. All rights reserved. |
| Keyword | continental rifting lower continental crust Hainan plume Dupal anomaly South China Sea |
| DOI | 10.1016/j.epsl.2018.02.040 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[41522602] ; National Natural Science Foundation of China[41376065] ; Qingdao National Laboratory for Marine Science and Technology[2015ASTP] ; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02] ; Chinese Academy of Sciences[XDA11030103] ; National Natural Science Foundation of China[41522602] ; National Natural Science Foundation of China[41376065] ; Qingdao National Laboratory for Marine Science and Technology[2015ASTP] ; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02] ; Chinese Academy of Sciences[XDA11030103] |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000430767500015 |
| Publisher | ELSEVIER SCIENCE BV |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/158997 |
| Collection | 海洋地质与环境重点实验室 深海极端环境与生命过程研究中心 |
| Corresponding Author | Zhang, Guo-Liang |
| Affiliation | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 4.Univ Queensland, Ctr Microscopy & Microanal, Radiogen Isotope Lab, Brisbane, Qld 4072, Australia 5.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA 6.China Earthquake Adm, Inst Crustal Dynam, Beijing 100085, Peoples R China 7.Sun Yat Sen Univ, Sch Marine Sci, Guang Zhou 510275, Guangdong, Peoples R China |
| First Author Affilication | Institute of Oceanology, Chinese Academy of Sciences; Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res |
| Corresponding Author Affilication | Institute of Oceanology, Chinese Academy of Sciences; Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res |
| Recommended Citation GB/T 7714 | Zhang, Guo-Liang,Luo, Qing,Zhao, Jian,et al. Geochemical nature of sub-ridge mantle and opening dynamics of the South China[J]. EARTH AND PLANETARY SCIENCE LETTERS,2018,489:145-155. |
| APA | Zhang, Guo-Liang,Luo, Qing,Zhao, Jian,Jackson, Matthew G.,Guo, Li-Shuang,&Zhong, Li-Feng.(2018).Geochemical nature of sub-ridge mantle and opening dynamics of the South China.EARTH AND PLANETARY SCIENCE LETTERS,489,145-155. |
| MLA | Zhang, Guo-Liang,et al."Geochemical nature of sub-ridge mantle and opening dynamics of the South China".EARTH AND PLANETARY SCIENCE LETTERS 489(2018):145-155. |
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