Remnants of shifting early Cenozoic Pacific lower mantle flow imaged beneath the Philippine Sea Plate

doi:10.1038/s41561-024-01404-6

IOCAS-IR > 海洋地质与环境重点实验室

	Remnants of shifting early Cenozoic Pacific lower mantle flow imaged beneath the Philippine Sea Plate
	Fan, Jianke 1,2; Zhao, Dapeng 3; Li, Cuilin 1,2; Liu, Lijun 4; Dong, Dongdong 1,2
	2024-03-12
发表期刊	NATURE GEOSCIENCE
ISSN	1752-0894
页码	8
通讯作者	Fan, Jianke(fanjianke@qdio.ac.cn) ; Li, Cuilin(cuilinli@qdio.ac.cn)
摘要	Seismic anisotropy could provide vital information about the evolution and internal convection of the deep Earth interior. Although previous seismological studies have revealed a wide distribution of seismic anisotropy in the upper portion of the lower mantle beneath many subduction zones, the existence of anisotropy at these depths away from subducted slabs remains debated. Here we use P-wave azimuthal anisotropy tomography to image the crust and mantle down to 1,600-km depth. We find prominent anisotropic patterns in the upper portion of the lower mantle beneath the Philippine Sea Plate. Substantial azimuthal anisotropy with N-S fast-velocity directions occurs at 700-900-km depths. We interpret this azimuthal anisotropy as a remnant of the Pacific lower mantle flow field about 50 million years ago. Two isolated high-velocity anomalies at 700-1,600-km depths may be vestigial pieces of the subducted Izanagi slab with seismic velocity features suggesting a shift in the Pacific lower mantle flow field by about 40 million years ago. Our findings provide seismic evidence for the existence of complex lower mantle flows and deformation mechanisms away from subduction zones. A record of lower mantle flow from 50 million years ago is preserved in the Pacific region and provides evidence for past lower mantle deformation, according to seismic anisotropy tomography.
DOI	10.1038/s41561-024-01404-6
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (National Science Foundation of China) ; Ocean Hemisphere Project[41976052] ; Ocean Hemisphere Project[42376080] ; Ocean Hemisphere Project[41876043] ; Ocean Hemisphere Project[92355302] ; National Natural Science Foundation of China[XDB42020102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[tsqn202312263] ; Taishan Scholars Program[19H01996] ; Japan Society for the Promotion of Science
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001183649000001
出版者	NATURE PORTFOLIO
WOS关键词	WAVE ANISOTROPIC TOMOGRAPHY ; PYROLITIC LOWER MANTLE ; TRAVEL-TIMES ; DYNAMICS ; ZONE ; DISCONTINUITY ; PEROVSKITE ; REGION ; CREEP
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/184921
专题	海洋地质与环境重点实验室
通讯作者	Fan, Jianke; Li, Cuilin
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Ocean Mega Sci, CAS Key Lab Marine Geol & Environm, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 3.Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Japan 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
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
推荐引用方式 GB/T 7714	Fan, Jianke,Zhao, Dapeng,Li, Cuilin,et al. Remnants of shifting early Cenozoic Pacific lower mantle flow imaged beneath the Philippine Sea Plate[J]. NATURE GEOSCIENCE,2024:8.
APA	Fan, Jianke,Zhao, Dapeng,Li, Cuilin,Liu, Lijun,&Dong, Dongdong.(2024).Remnants of shifting early Cenozoic Pacific lower mantle flow imaged beneath the Philippine Sea Plate.NATURE GEOSCIENCE,8.
MLA	Fan, Jianke,et al."Remnants of shifting early Cenozoic Pacific lower mantle flow imaged beneath the Philippine Sea Plate".NATURE GEOSCIENCE (2024):8.