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Teleseismic imaging of the mantle beneath southernmost China: New insights into the Hainan plume
Xia, Shaohong; Zhao, Dapeng; Sun, Jinlong; Huang, Haibo; Xia, SH (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
2016
发表期刊GONDWANA RESEARCH
卷号36页码:46-56
摘要Intraplate volcanism during the Late Cenozoic in the Leiqiong area of southernmost China, with basaltic lava flows covering a total of more than 7000 km(2), has been attributed to an underlying Hainan plume. To clarify detailed features of the Hainan plume, such as the morphology of its magmatic conduits, the depth of its magmatic pool in the upper mantle and the pattern of mantle upwelling, we determined tomographic images of the mantle down to a depth of 1100 km beneath southern China using 18,503 high-quality arrival-time data of 392 distant earthquakes recorded by a dense seismic array. Our results show a mushroom-like continuous low-velocity anomaly characterized by a columnar tail with a diameter of 200-300 km extending down to the lower mantle beneath north of the Hainan hotspot and a head spreading laterally in and around the mantle transition zone, indicating a magmatic pool in the upper mantle. Further upward, the plume head is decomposed into smaller patches, and when reaching the base of the lithosphere, a pancake-like anomaly has formed to feed the Hainan hotspot. This result challenges the classical model of a fixed thermal plume that rises vertically to the surface. Hence we propose a new layering-style model for the magmatic upwelling of the Hainan plume. Our results indicate spatial complexities and variations of mantle plumes probably due to heterogeneous compositions and thermochemical structures of the deep mantle. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
部门归属[Xia, Shaohong; Sun, Jinlong; Huang, Haibo] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Xia, Shaohong; Zhao, Dapeng] Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan ; 边缘海地质
关键词Hainan Plume Teleseismic Tomography Intraplate Volcanism Thermochemical Mantle Southern China
学科领域Geology
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15328
专题中科院边缘海地质重点实验室
通讯作者Xia, SH (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
推荐引用方式
GB/T 7714
Xia, Shaohong,Zhao, Dapeng,Sun, Jinlong,et al. Teleseismic imaging of the mantle beneath southernmost China: New insights into the Hainan plume[J]. GONDWANA RESEARCH,2016,36:46-56.
APA Xia, Shaohong,Zhao, Dapeng,Sun, Jinlong,Huang, Haibo,&Xia, SH .(2016).Teleseismic imaging of the mantle beneath southernmost China: New insights into the Hainan plume.GONDWANA RESEARCH,36,46-56.
MLA Xia, Shaohong,et al."Teleseismic imaging of the mantle beneath southernmost China: New insights into the Hainan plume".GONDWANA RESEARCH 36(2016):46-56.
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