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DOI | 10.1038/s41561-018-0075-y |
Lower-mantle plume beneath the Yellowstone hotspot revealed by core waves | |
Nelson, Peter L.; Grand, Stephen P. | |
2018-04-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:4页码:280-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 degrees 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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000457244300001 |
WOS关键词 | CASCADIA SUBDUCTION ZONE ; ANISOTROPY BENEATH ; SPECTRAL-ELEMENT ; SHEAR ; WESTERN ; ORIGIN ; TIMES ; SLABS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34687 |
专题 | 地球科学 气候变化 |
作者单位 | Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA |
推荐引用方式 GB/T 7714 | Nelson, Peter L.,Grand, Stephen P.. Lower-mantle plume beneath the Yellowstone hotspot revealed by core waves[J]. NATURE GEOSCIENCE,2018,11(4):280-+. |
APA | Nelson, Peter L.,&Grand, Stephen P..(2018).Lower-mantle plume beneath the Yellowstone hotspot revealed by core waves.NATURE GEOSCIENCE,11(4),280-+. |
MLA | Nelson, Peter L.,et al."Lower-mantle plume beneath the Yellowstone hotspot revealed by core waves".NATURE GEOSCIENCE 11.4(2018):280-+. |
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