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DOI | 10.1029/2019GL083668 |
Effects of the Compositional Viscosity Ratio on the Long-Term Evolution of Thermochemical Reservoirs in the Deep Mantle | |
Li, Yang1,2,3; Deschamps, Frederic4; Yang, Jianfeng2,3; Chen, Lin2,3; Zhao, Liang2,3; Tackley, Paul J.5 | |
2019-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:16页码:9591-9601 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Taiwan; Switzerland |
英文摘要 | Numerical experiments of thermochemical mantle convection in 2-D spherical annulus geometry are performed to investigate the effects of compositional viscosity ratio (Delta eta(C)) on the long-term evolution of reservoirs of dense, primordial material in the lowermost mantle of the Earth. The internal heating rate in the primordial material is larger than in the ambient mantle by a factor of 10, accounting for the fact that this material may be enriched in radiogenic elements. We find that if the chemical density contrast is large (128 kg/m(3)), Delta eta(C) plays only a second-order role on the long-term stability of these reservoirs. As the chemical density contrast decreases to smaller values (90 kg/m(3)), Delta eta(C) plays a more significant role. More specifically, when Delta eta(C) is large, around 10 or larger, convection within the reservoirs of primordial material is less vigorous, which increases the temperature and thermal buoyancy of these structures. This, in turn, can eventually lead them to become unstable, with the majority of the primordial material being advected into the large-scale mantle circulation. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490966700033 |
WOS关键词 | SHEAR-VELOCITY ; PRIMORDIAL RESERVOIRS ; TRAVEL-TIME ; NORMAL-MODE ; CONVECTION ; TOMOGRAPHY ; HEAT ; CONSTRAINTS ; HETEROGENEITIES ; GENERATION |
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/186243 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China; 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher & Evolut, Beijing, Peoples R China; 3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China; 4.Acad Sinica, Inst Earth Sci, Taipei, Taiwan; 5.Swiss Fed Inst Technol, Dept Earth Sci, Inst Geophys, Zurich, Switzerland |
推荐引用方式 GB/T 7714 | Li, Yang,Deschamps, Frederic,Yang, Jianfeng,et al. Effects of the Compositional Viscosity Ratio on the Long-Term Evolution of Thermochemical Reservoirs in the Deep Mantle[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(16):9591-9601. |
APA | Li, Yang,Deschamps, Frederic,Yang, Jianfeng,Chen, Lin,Zhao, Liang,&Tackley, Paul J..(2019).Effects of the Compositional Viscosity Ratio on the Long-Term Evolution of Thermochemical Reservoirs in the Deep Mantle.GEOPHYSICAL RESEARCH LETTERS,46(16),9591-9601. |
MLA | Li, Yang,et al."Effects of the Compositional Viscosity Ratio on the Long-Term Evolution of Thermochemical Reservoirs in the Deep Mantle".GEOPHYSICAL RESEARCH LETTERS 46.16(2019):9591-9601. |
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