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

doi:10.1016/j.dsr.2023.103964

CORC > 海洋研究所 > 中国科学院海洋研究所 > 深海极端环境与生命过程研究中心

	The foundering of stagnant slabs bearing oceanic plateau into the lower mantle
	Liu, Xi 2; Li, Juan 3,4; Zhang, Zhigang 3,4; Sun, Weidong 1,2,4
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.