The foundering of stagnant slabs bearing oceanic plateau into the lower mantle

doi:10.1016/j.dsr.2023.103964

	The foundering of stagnant slabs bearing oceanic plateau into the lower mantle
	Liu, Xi 1; Li, Juan 2,4; Zhang, Zhigang 2,4; Sun, Weidong1,3,4
	2023-04-01
发表期刊	DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
ISSN	0967-0637
卷号	194 页码:6
通讯作者	Liu, Xi([email protected]) ; Sun, Weidong([email protected])
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.
关键词	Plume head Oceanic plateau Slab foundering Transition zone Density barrier
DOI	10.1016/j.dsr.2023.103964
收录类别	SCI
语种	英语
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研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000995854000001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS关键词	SUBDUCTION ; PACIFIC ; DYNAMICS ; PROVINCE ; CHINA
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/183102
专题	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.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 3.Deep Sea Multidisciplinary Res Ctr, Laoshan Lab, Qingdao 266237, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, 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	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.