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DOI | 10.1038/s41467-019-13482-x |
Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D鈥?layer | |
[unavailable] | |
2019-12-12 | |
发表期刊 | Nature Communications |
出版年 | 2019 |
卷号 | 10 |
文章类型 | Article |
语种 | 英语 |
英文摘要 | Bridgmanite, the dominant mineral in the Earth鈥檚 lower mantle, crystallizes in the perovskite structure and transforms into post-perovskite at conditions relevant for the D\({}^{{\prime\prime} }\) layer. This transformation affects the dynamics of the Earth鈥檚 lowermost mantle and can explain a range of seismic observations. The thickness over which the two phases coexist, however, can extend over 100聽km, casting doubt on the assignment of the observed seismic boundaries. Here, experiments show that the bridgmanite to post-perovskite transition in (Mg\({}_{0.86}\),Fe\({}_{0.14}\))SiO\({}_{3}\) is fast on geological timescales. The transformation kinetics, however, affects reflection coefficients of \(P\) and \(S\) waves by more than one order of magnitude. Thick layers of coexisting bridgmanite and post-perovskite can hence be detected using seismic reflections. Morever, the detection and wave period dependence of D\({}^{{\prime\prime} }\) reflections can be used to constrain significant features of the Earth鈥檚 lowermost mantle, such as the thickness of the coexistence layer, and obtain information on temperature and grain sizes. |
领域 | 资源环境 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/232475 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | [unavailable]. Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D鈥?layer[J]. Nature Communications,2019,10. |
APA | [unavailable].(2019).Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D鈥?layer.Nature Communications,10. |
MLA | [unavailable]."Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D鈥?layer".Nature Communications 10(2019). |
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