The foundering of stagnant slabs bearing oceanic plateau into the lower mantle | |
Liu, Xi2; Li, Juan3,4; Zhang, Zhigang3,4; Sun, Weidong1,2,4 | |
刊名 | DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS |
2023-04-01 | |
卷号 | 194页码:6 |
关键词 | Plume head Oceanic plateau Slab foundering Transition zone Density barrier |
ISSN号 | 0967-0637 |
DOI | 10.1016/j.dsr.2023.103964 |
通讯作者 | Liu, Xi(xiliu@qdio.ac.cn) ; Sun, Weidong(weidongsun@qdio.ac.cn) |
英文摘要 | The oceanic plateau is proposed to be produced by the plume head. Seeking the missing plume head associated with seamount chains is an important task to evaluate the plume theory. While the subduction initiation and process of the oceanic plateau is debatable, recent seismic studies suggest that the Hawaiian-Emperor oceanic plateau has been subducted into the lower mantle. The sinking rate is higher than previously estimated and even higher than that of the normal slab. It is intriguing, as the phase transitions would cause a density barrier for the basaltic materials from-660-km to-720-km depths, and slow down the subduction of the slabs, especially for the oceanic plateau with a thickened basaltic crust. Here, we perform geodynamic numerical experiments to investigate the foundering process of flat stagnant slabs from the transition zone into the lower mantle. We compare models of both the normal slab and slabs bearing oceanic plateau and suggest that a basaltic underplate layer beneath the peridotite mantle lithosphere in the oceanic plateau can lead to a higher foundering rate. The underplated oceanic plateau can reach-1000-km depth in-50 Myrs. These models provide a new perspective in understanding the fate of subducted oceanic plateau, suggesting that missing plume heads might be found in the lower mantle. |
资助项目 | Laoshan Laboratory[2022LSKJ050201-1] ; Laoshan Laboratory[2022LSKJ050201-4] ; Taishan Scholar Program of Shandong[ts201712075] ; Key Research Program of the Institute of Geology & Geophysics, CAS[IGGCAS-201904] ; Open Research Program of the Institute of Geology & Geophysics, CAS[DQXX2021-02] ; Oceanographic Data Center, IOCAS |
WOS关键词 | SUBDUCTION ; PACIFIC ; DYNAMICS ; PROVINCE ; CHINA |
WOS研究方向 | Oceanography |
语种 | 英语 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
WOS记录号 | WOS:000995854000001 |
内容类型 | 期刊论文 |
源URL | [http://ir.qdio.ac.cn/handle/337002/183101] |
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 | Liu, Xi; Sun, Weidong |
作者单位 | 1.Deep Sea Multidisciplinary Res Ctr, Laoshan Lab, Qingdao 266237, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Liu, Xi,Li, Juan,Zhang, Zhigang,et al. The foundering of stagnant slabs bearing oceanic plateau into the lower mantle[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2023,194:6. |
APA | Liu, Xi,Li, Juan,Zhang, Zhigang,&Sun, Weidong.(2023).The foundering of stagnant slabs bearing oceanic plateau into the lower mantle.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,194,6. |
MLA | Liu, Xi,et al."The foundering of stagnant slabs bearing oceanic plateau into the lower mantle".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 194(2023):6. |
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