Overlapping hotspot tracks and melts from diffuse plume materials in the upper mantle generated intraplate seamount groups in the West Pacific
文献类型：期刊论文
| 作者 | Wei, Xun2,3,7; Zhang, Guo-Liang4; Zhang, Ji4; Shi, Xue-Fa2,3,7; Castillo, Paterno R.1; Zhang, Yan2,3; Zhang, Wan-Feng5; Xu, Yi-Gang5,6; Li, Hong-Yan5,6; Zhang, Hui2,3 |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
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| 出版日期 | 2024-10-01 |
| 卷号 | 643页码:16 |
| 关键词 | Intraplate volcano EM HIMU Hotspot Mantle plume Lithosphere fracture |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2024.118901 |
| 英文摘要 | 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. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001277926500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78201]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Wei, Xun; Zhang, Ji; Shi, Xue-Fa |
| 作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, 9500 Gilman Dr, La Jolla, CA 92093 USA 2.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China 3.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Qingdao 266071, Peoples R China 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 |
| 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. |
入库方式： OAI收割
来源：广州地球化学研究所
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