| DOI: | 10.1038/s41561-018-0075-y
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| 论文题名: | Lower-mantle plume beneath the Yellowstone hotspot revealed by core waves |
| 作者: | Nelson P.L.; Grand S.P.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2018
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| 卷: | 11, 期:4 | | 起始页码: | 280
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| 结束页码: | 284
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| 语种: | 英语
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| 英文摘要: | The Yellowstone hotspot, located in North America, is an intraplate source of magmatism the cause of which is hotly debated. Some argue that a deep mantle plume sourced at the base of the mantle supplies the heat beneath Yellowstone, whereas others claim shallower subduction or lithospheric-related processes can explain the anomalous magmatism. Here we present a shear wave tomography model for the deep mantle beneath the western United States that was made using the travel times of core waves recorded by the dense USArray seismic network. The model reveals a single narrow, cylindrically shaped slow anomaly, approximately 350 km in diameter that we interpret as a whole-mantle plume. The anomaly is tilted to the northeast and extends from the core-mantle boundary to the surficial position of the Yellowstone hotspot. The structure gradually decreases in strength from the deepest mantle towards the surface and if it is purely a thermal anomaly this implies an initial excess temperature of 650 to 850 °C. Our results strongly support a deep origin for the Yellowstone hotspot, and also provide evidence for the existence of thin thermal mantle plumes that are currently beyond the resolution of global tomography models. © 2018 The Author(s). |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/105575
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States
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| Recommended Citation: | |
Nelson P.L.,Grand S.P.. Lower-mantle plume beneath the Yellowstone hotspot revealed by core waves[J]. Nature Geoscience,2018-01-01,11(4)
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