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| MORB-like delta Fe-56 values unveil the effect of subduction on the South China Sea basalts | |
Liao, Renqiang1,2,3,4 ; Liu, He1,2,3; Zhu, Hongli1,2,3; Deng, Jianghong1,2,3; Li, Congying1,2,3; Sun, Weidong1,2,3,4
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| 2021-05-20 | |
| 发表期刊 | CHEMICAL GEOLOGY
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| ISSN | 0009-2541 |
| 卷号 | 569页码:9 |
| 通讯作者 | Zhu, Hongli([email protected]) ; Deng, Jianghong([email protected]) |
| 摘要 | Clarifying the genesis of backarc basin basalts (BABBs) is of great significance for understanding the cycling of subducted materials. Here we show MORB-like Fe isotopic signatures (delta Fe-56) of basalts recovered from the South China Sea (SCS), a well-developed backarc basin, as an indicator to investigate the influence of subduction on the BABBs. Whole-rock chemical compositions and olivine chemistry indicate the presence of pyroxenitic components in the peridotitic mantle. Melting of a pyroxenite-bearing peridotite indicates an addition of similar to 10-40% of pyroxenitic melts to the peridotitic mantle in the SCS, which should result in higher delta Fe-56 values than that of global MORBs. It is inconsistent with the MORB-like delta Fe-56 values we observed in the SCS basalts. Therefore, a component with low delta Fe-56 signatures may exist in the source of the SCS basalts, which is most likely derived from subducted materials. Such a scenario can be well corroborated by mixing depleted MORB mantle with subducted fluids and pyroxenitic melts. This study emphasizes that the MORB-like Fe isotopic signatures in backarc basin basalts can be caused by multi-factors, especially in the case of heterogeneous mantle source. |
| 关键词 | Iron isotopes The South China Sea IODP Expedition 349 Pyroxenite Plate subduction |
| DOI | 10.1016/j.chemgeo.2021.120124 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA22050103]; National Key Resource & Development Program of China[2016YFC0600408]; Taishan Scholar Program of Shandong[ts201712075]; AoShan Talents Cultivation Program - Qingdao National Laboratory for Marine Science and Technology[2017ASTCP-OS07] |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000637385500002 |
| 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/337002/170465 |
| 专题 | 深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhu, Hongli; Deng, Jianghong |
| 作者单位 | 1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 通讯作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 推荐引用方式 GB/T 7714 | Liao, Renqiang,Liu, He,Zhu, Hongli,et al. MORB-like delta Fe-56 values unveil the effect of subduction on the South China Sea basalts[J]. CHEMICAL GEOLOGY,2021,569:9. |
| APA | Liao, Renqiang,Liu, He,Zhu, Hongli,Deng, Jianghong,Li, Congying,&Sun, Weidong.(2021).MORB-like delta Fe-56 values unveil the effect of subduction on the South China Sea basalts.CHEMICAL GEOLOGY,569,9. |
| MLA | Liao, Renqiang,et al."MORB-like delta Fe-56 values unveil the effect of subduction on the South China Sea basalts".CHEMICAL GEOLOGY 569(2021):9. |
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