| Recycling of carbon from the stagnant paleo-Pacific slab beneath Eastern China revealed by olivine geochemistry | |
| Yao, Junhua1,2,3; Zhang, Guoliang1,2,3,4; Wang, Shuai1,2,3; Zhao, Jianxin5 | |
| 2021-10-01 | |
| 发表期刊 | LITHOS
 |
| ISSN | 0024-4937 |
| 卷号 | 398页码:12 |
| 通讯作者 | Zhang, Guoliang([email protected]) |
| 摘要 | Plate subduction provides a potential link of carbon between the Earth's surface and interior. It remains unclear if plate subduction has caused enrichment of carbon in the deep mantle. The Eastern China continent is underlain by the stagnant slab of the paleo-Pacific in the deep upper mantle, and the young intraplate volcanism in Eastern China provides a window to examine the carbon cycle associated with the slab materials. Here we report two ol-ivine phenocryst types in nephelinites from Qixia, Shandong province, China: extreme-Mg olivine, with Fo con-tents up to 99 mol% and low Ca, Mn, and Ni contents (<500 ppm), and normal olivine (Fo <88 mol%). Crystallization modelling suggests that the extreme-Mg olivine crystallized from early primitive carbonated melts. Furthermore, the CO2-rich nature of the primary melts is also shown by Ca-Mg-rich and Si-poor carbon-ated melt inclusions hosted in olivine phenocrysts. The low-Ca contents (<1000 ppm) of the normal olivine can be explained by the low Ca partition coefficient between olivine and melts rich in CO2 (similar to 20 wt%). The results of this study provide robust mineralogical evidence for a genetic relationship between the nephelinites and pri-mary carbonated melts. Together with whole-rock geochemistry data of major and trace elements and Sr-Nd-Pb-Hf isotopes, we suggest that the primary carbonated melts are consistent with origin from the stagnant paleo-Pacific slab in the mantle transition zone underlying Eastern China. (C) 2021 Elsevier B.V. All rights reserved. |
| 关键词 | Extreme-Mg olivine Nephelinite Carbonated melt Stagnant slab Carbon cycle Eastern China |
| DOI | 10.1016/j.lithos.2021.106249 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[91858206]; National Natural Science Foundation of China[41876040]; Taishan Scholars Program of Shandong Province[tsqn201909157]; Natural Science Foundation of Shandong Province[ZR2020MD070] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:000687293800004 |
| 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/337002/176276 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zhang, Guoliang |
| 作者单位 | 1.Chinese Acad Sci, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266000, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 5.Univ Queensland, Ctr Microscopy & Microanal, Radiogen Isotope Lab, Brisbane, Qld 4072, Australia |
| 第一作者单位 | 中国科学院海洋研究所 |
| 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 | Yao, Junhua,Zhang, Guoliang,Wang, Shuai,et al. Recycling of carbon from the stagnant paleo-Pacific slab beneath Eastern China revealed by olivine geochemistry[J]. LITHOS,2021,398:12. |
| APA | Yao, Junhua,Zhang, Guoliang,Wang, Shuai,&Zhao, Jianxin.(2021).Recycling of carbon from the stagnant paleo-Pacific slab beneath Eastern China revealed by olivine geochemistry.LITHOS,398,12. |
| MLA | Yao, Junhua,et al."Recycling of carbon from the stagnant paleo-Pacific slab beneath Eastern China revealed by olivine geochemistry".LITHOS 398(2021):12. |
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