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| DOI | 10.1029/2019JB019312 |
| The Formation of Hot Thermal Anomalies in Cold Subduction-Influenced Regions of Earth's Lowermost Mantle | |
| Li M. | |
| 发表日期 | 2020 |
| ISSN | 21699313 |
| 卷号 | 125期号:6 |
| 英文摘要 | The Earth's lowermost mantle is characterized by two large low shear velocity provinces (LLSVPs). The regions outside the LLSVPs have been suggested to be strongly influenced by subducted slabs and, therefore, much colder than the LLSVPs. However, localized low-velocity seismic anomalies have been detected in the subduction-influenced regions, whose origin remains unclear. Here, three-dimensional geodynamic calculations are performed, and they show that linear, ridge-like hot thermal anomalies, or thermal ridges, form in the relatively cold, downwelling regions of the lowermost mantle. Like the formation of Richter rolls due to sublithosphere small-scale convection (SSC), the thermal ridges form as a result of SSC from the basal thermal boundary layer and they extend in directions parallel to the surrounding mantle flow. The formation of thermal ridges in subduction regions of the lowermost mantle is very sensitive to the thermal structures of the subducted materials, and thermal heterogeneities brought to the bottom of the mantle by subducting slabs greatly promote the formation of thermal ridges. The formation of thermal ridges is also facilitated by the increase of core-mantle boundary heat flux and vigor of lowermost mantle convection. The thermal ridges may explain the low-velocity seismic anomalies outside of the LLSVPs in the lowermost mantle. The results suggest that the relatively cold, subduction-influenced regions of the Earth's lowermost mantle may contain localized hot anomalies. ©2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | hot thermal anomalies; LLSVP; low-velocity structures; lowermost mantle; mantle plumes; subducting slabs |
| 语种 | 英语 |
| 来源期刊 | Journal of Geophysical Research: Solid Earth
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/187796 |
| 作者单位 | School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States |
| 推荐引用方式 GB/T 7714 | Li M.. The Formation of Hot Thermal Anomalies in Cold Subduction-Influenced Regions of Earth's Lowermost Mantle[J],2020,125(6). |
| APA | Li M..(2020).The Formation of Hot Thermal Anomalies in Cold Subduction-Influenced Regions of Earth's Lowermost Mantle.Journal of Geophysical Research: Solid Earth,125(6). |
| MLA | Li M.."The Formation of Hot Thermal Anomalies in Cold Subduction-Influenced Regions of Earth's Lowermost Mantle".Journal of Geophysical Research: Solid Earth 125.6(2020). |
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