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DOI | 10.1073/pnas.2004269117 |
Evidence for complex iron oxides in the deep mantle from FeNi(Cu) inclusions in superdeep diamond | |
Chiara Anzolini; Katharina Marquardt; Vincenzo Stagno; Luca Bindi; Daniel J. Frost; D. Graham Pearson; Jeffrey W. Harris; Russell J. Hemley; Fabrizio Nestola | |
2020-08-12 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2020 |
英文摘要 | The recent discovery in high-pressure experiments of compounds stable to 24–26 GPa with Fe4O5, Fe5O6, Fe7O9, and Fe9O11 stoichiometry has raised questions about their existence within the Earth’s mantle. Incorporating both ferric and ferrous iron in their structures, these oxides if present within the Earth could also provide insight into diamond-forming processes at depth in the planet. Here we report the discovery of metallic particles, dominantly of FeNi (Fe0.71Ni0.24Cu0.05), in close spatial relation with nearly pure magnetite grains from a so-called superdeep diamond from the Earth’s mantle. The microstructural relation of magnetite within a ferropericlase (Mg0.60Fe0.40)O matrix suggests exsolution of the former. Taking into account the bulk chemistry reconstructed from the FeNi(Cu) alloy, we propose that it formed by decomposition of a complex metal M oxide (M4O5) with a stoichiometry of (Fe3+2.15Fe2+1.59Ni2+0.17Cu+0.04)Σ = 3.95O5. We further suggest a possible link between this phase and variably oxidized ferropericlase that is commonly trapped in superdeep diamond. The observation of FeNi(Cu) metal in relation to magnetite exsolved from ferropericlase is interpreted as arising from a multistage process that starts from diamond encapsulation of ferropericlase followed by decompression and cooling under oxidized conditions, leading to the formation of complex oxides such as Fe4O5 that subsequently decompose at shallower P-T conditions. |
领域 | 地球科学 |
URL | 查看原文 |
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/287924 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Chiara Anzolini,Katharina Marquardt,Vincenzo Stagno,et al. Evidence for complex iron oxides in the deep mantle from FeNi(Cu) inclusions in superdeep diamond[J]. Proceedings of the National Academy of Science,2020. |
APA | Chiara Anzolini.,Katharina Marquardt.,Vincenzo Stagno.,Luca Bindi.,Daniel J. Frost.,...&Fabrizio Nestola.(2020).Evidence for complex iron oxides in the deep mantle from FeNi(Cu) inclusions in superdeep diamond.Proceedings of the National Academy of Science. |
MLA | Chiara Anzolini,et al."Evidence for complex iron oxides in the deep mantle from FeNi(Cu) inclusions in superdeep diamond".Proceedings of the National Academy of Science (2020). |
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