南方科技大学知识苑(SUSTech KC): Gondwanan flood basalts linked seismically to plume- induced lithosphere instability

题名	Gondwanan flood basalts linked seismically to plume- induced lithosphere instability
作者	Shi, Yanan; Morgan, Jason P.
通讯作者	Shi, Yanan; Morgan, Jason P.
发表日期	2024-03-19
DOI	10.1073/pnas.2320054121
发表期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 影响因子和分区
ISSN	0027-8424
EISSN	1091-6490
卷号	121 期号:12
摘要	Delamination of the continental lithospheric mantle is well recorded beneath several continents. However, the fate of the removed continental lithosphere has been rarely noted, unlike subducted slabs reasonably well imaged in the upper and mid mantle. Beneath former Gondwana, recent seismic tomographic models indicate the presence of at least 5 horizontal fast- wavespeed anomalies at -600 km depths that do not appear to be related to slab subduction, including fast structures in locations consistent with delamination associated with the Parana Flood Basalt event at -134 Ma and the Deccan Traps event at -66 Ma. These fast- wavespeed anomalies often lie above broad slow seismic wavespeed trunks at 500 to 700 km depths beneath former Gondwana, with slow wavespeed anomalies branching around them. Numerical experiments indicate that delaminated lithosphere tends to stagnate in the transition zone and mid - mantle above a mantle plume where it shapes subsequent plume upwelling. For hot plumes, the melt volume generated during plume- influenced delamination can easily reach -2 to 4 x 106 km3, consistent with the basalt eruption volume at the Deccan Traps. This seismic and numerical evidence suggests that observed high- wavespeed mid - mantle anomalies beneath the locations of former flood basalts are delaminated fragments of former continental lithosphere, and that lithospheric delamination events in the presence of subcontinental plumes induced several of the continental flood basalts associated with the multiple breakup stages of Gondwanaland. Continued upwelling in these plumes can also have entrained subcontinental lithosphere in the mid - mantle to bring its distinctive geochemical signal to the modern mid - ocean spreading centers that surround southern and western Africa.
关键词	Gondwanan flood basalts lithosphere instability mantle plume seismic tomography
相关链接	[来源记录]
收录类别	SCI
语种	英语
学校署名	第一 ; 通讯
资助项目	NSF of China["42204098","92058212","42074114","K22311011"]
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001206174500007
出版者	NATL ACAD SCIENCES
ESI学科分类	BIOLOGY & BIOCHEMISTRY ; CLINICAL MEDICINE ; MULTIDISCIPLINARY ; PLANT & ANIMAL SCIENCE ; ENVIRONMENT/ECOLOGY ; SOCIAL SCIENCES, GENERAL ; MICROBIOLOGY ; ECONOMICS BUSINESS ; IMMUNOLOGY ; MATERIALS SCIENCE ; MATHEMATICS ; SPACE SCIENCE ; MOLECULAR BIOLOGY & GENETICS ; PHARMACOLOGY & TOXICOLOGY ; CHEMISTRY ; PSYCHIATRY/PSYCHOLOGY ; NEUROSCIENCE & BEHAVIOR ; PHYSICS ; GEOSCIENCES ; AGRICULTURAL SCIENCES ; ENGINEERING
来源库	Web of Science
引用统计	被引频次[WOS]：1
成果类型	期刊论文
条目标识符	http://sustech.caswiz.com/handle/2SGJ60CL/788386
专题	工学院_海洋科学与工程系
作者单位	Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
第一作者单位	海洋科学与工程系
通讯作者单位	海洋科学与工程系
第一作者的第一单位	海洋科学与工程系
推荐引用方式 GB/T 7714	Shi, Yanan,Morgan, Jason P.. Gondwanan flood basalts linked seismically to plume- induced lithosphere instability[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2024,121(12).
APA	Shi, Yanan,&Morgan, Jason P..(2024).Gondwanan flood basalts linked seismically to plume- induced lithosphere instability.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,121(12).
MLA	Shi, Yanan,et al."Gondwanan flood basalts linked seismically to plume- induced lithosphere instability".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 121.12(2024).