| DOI: | 10.1038/ngeo3029
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| 论文题名: | Impact-driven subduction on the Hadean Earth |
| 作者: | O'Neill C.; Marchi S.; Zhang S.; Bottke W.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2017
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| 卷: | 10, 期:10 | | 起始页码: | 793
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| 结束页码: | 797
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| 语种: | 英语
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| Scopus关键词: | cratering
; crustal evolution
; early Earth
; Hadean
; mantle upwelling
; planet
; planetary evolution
; plate tectonics
; simulation
; solar system
; subduction
|
| 英文摘要: | Impact cratering was a dominant geologic process in the early Solar System that probably played an active role in the crustal evolution of the young terrestrial planets. The Earth's interior during the Hadean, 4.56 to 4 billion years ago, may have been too hot to sustain plate tectonics. However, whether large impacts could have triggered tectonism on the early Earth remains unclear. Here we conduct global-scale tectonic simulations of the evolution of the Earth through the Hadean eon under variable impact fluxes. Our simulations show that the thermal anomalies produced by large impacts induce mantle upwellings that are capable of driving transient subduction events. Furthermore, we find that moderate-sized impacts can act as subduction triggers by causing localized lithospheric thinning and mantle upwelling, and modulate tectonic activity. In contrast to contemporary subduction, the simulated localized subduction events are relatively short-lived (less than 10 Myr) with relatively thin, weak plates. We suggest that resurgence in subduction activity induced by an increased impact flux between 4.1 and 4.0 billion years ago may explain the coincident increase in palaeointensity of the magnetic field. We further suggest that transient impact-driven subduction reconciles evidence from Hadean zircons for tectonic activity with other lines of evidence consistent with an Earth that was largely tectonically stagnant from the Hadean into the Archaean. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. |
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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/105699
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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: | Macquarie Planetary Research Centre, Macquarie University, Sydney, NSW, Australia; Southwest Research Institute, Boulder, CO, United States
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| Recommended Citation: | |
O'Neill C.,Marchi S.,Zhang S.,et al. Impact-driven subduction on the Hadean Earth[J]. Nature Geoscience,2017-01-01,10(10)
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