Overlapping hotspot tracks and melts from diffuse plume materials in the upper mantle generated intraplate seamount groups in the West Pacific

doi:10.1016/j.epsl.2024.118901

IOCAS-IR > 海洋环流与波动重点实验室

	Overlapping hotspot tracks and melts from diffuse plume materials in the upper mantle generated intraplate seamount groups in the West Pacific
	Wei, Xun 1,2,7; Zhang, Guo-Liang 3; Zhang, Ji3 ; Shi, Xue-Fa 1,2,7; Castillo, Paterno R.4; Zhang, Yan 1,2; Zhang, Wan-Feng 5; Xu, Yi-Gang 5,6; Li, Hong-Yan 5,6; Zhang, Hui 1,2
	2024-10-01
发表期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
卷号	643 页码:16
通讯作者	Wei, Xun(xun.wei@fio.org.cn) ; Zhang, Ji(zhangji@qdio.ac.cn) ; Shi, Xue-Fa(xfshi@fio.org.cn)
摘要	An oceanic volcanic chain with linear age-distance relationships is generally attributed to originate from a primary mantle plume. The origin of many seamount groups in the West Pacific Seamount Province (WPSP), however, is enigmatic since they do not form narrow, age-progressive chains of volcanoes, but are characterized by irregular age-distance relationships. To investigate the origin of such seamounts, here we report new 40Ar/39Ar age, major and trace element, and Sr-Nd-Pb-Hf isotope data for lavas from Ita-Mai-Tai, Kocebu, Govorov, Skornyakova, and Gordin seamounts of the Magellan seamount group (MSG) in the WPSP. Lavas from these seamounts cover a wide range of isotopic compositions from high mu (=238U/204Pb) mantle (HIMU) to enriched mantle 1 (EM1) and 2 (EM2). Skornyakova and Govorov seamounts display predominantly EM1-like compositions with one sample from Skornyakova displaying a HIMU-like composition (e.g., (206Pb/204Pb)i = 19.87) and two samples from Govorov displaying EM2-like compositions. Kocebu lavas have HIMU-like isotopic compositions with high (206Pb/204Pb)i (up to 20.26). Together with the HIMU lavas in Pako guyot of the Magellan seamount trail, we propose that the HIMU component is most likely widespread in the Magellan area. The Magellan HIMU-like lavas exhibit slightly elevated (208Pb/204Pb)i for a given (206Pb/204Pb)i; this signature most likely originates from the Arago mantle plume. The co-occurrence of HIMU, EM1, and EM2 components in the MSG most likely results from overlapping of Arago, Rarotonga, and Samoa hotspot tracks. Combined with previous age data, the ages of EM1-type Ita-Mai-Tai, Skornyakova, and Gordin (84.2-95.4 Ma) seamounts do not lie on any particular South Pacific hotspot tracks, suggesting that they unlikely originated directly from deep mantle plumes. Their plume-like signatures most likely resulted from melting of diffuse plume materials mainly from Rarotonga and Samoa and to a lesser extent Macdonald plumes in the northern EM-domain of Cook-Austral volcanic lineament in response to lithosphere fracturing. We propose that overlapping of different hotspot tracks combined with preferential channeling of new magmas through pre-existing structural weaknesses or volcanic conduits control the complex age-spatial-geochemical relationships of intraplate seamount groups in the WPSP.
关键词	Intraplate volcano EM HIMU Hotspot Mantle plume Lithosphere fracture
DOI	10.1016/j.epsl.2024.118901
收录类别	SCI
语种	英语
资助项目	Basic Scientific Fund for National Public Research Institutes of China[2023S02] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302] ; National Natural Science Foundation of China[42076076] ; National Natural Science Foundation of China[42376075] ; PI Project of Southern Ma-rine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2022006] ; Taishan Scholar Program of Shandong Province
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001277926500001
出版者	ELSEVIER
WOS关键词	3 GPA ; GEOCHEMICAL EVIDENCE ; GARNET PERIDOTITE ; ISLAND ; VOLCANISM ; ECLOGITE ; ISOTOPE ; GENESIS ; HELIUM ; CO2
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186160
专题	海洋环流与波动重点实验室
通讯作者	Wei, Xun; Zhang, Ji; Shi, Xue-Fa
作者单位	1.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China 2.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Qingdao 266071, Peoples R China 4.Univ Calif San Diego, Scripps Inst Oceanog, 9500 Gilman Dr, La Jolla, CA 92093 USA 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 6.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China 7.Shandong Key Lab Deep Sea Mineral Resources Dev Pr, Qingdao 266061, Peoples R China
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	Wei, Xun,Zhang, Guo-Liang,Zhang, Ji,et al. Overlapping hotspot tracks and melts from diffuse plume materials in the upper mantle generated intraplate seamount groups in the West Pacific[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,643:16.
APA	Wei, Xun.,Zhang, Guo-Liang.,Zhang, Ji.,Shi, Xue-Fa.,Castillo, Paterno R..,...&Zhang, Hui.(2024).Overlapping hotspot tracks and melts from diffuse plume materials in the upper mantle generated intraplate seamount groups in the West Pacific.EARTH AND PLANETARY SCIENCE LETTERS,643,16.
MLA	Wei, Xun,et al."Overlapping hotspot tracks and melts from diffuse plume materials in the upper mantle generated intraplate seamount groups in the West Pacific".EARTH AND PLANETARY SCIENCE LETTERS 643(2024):16.