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Bures R, Faberova M, Bircakova Z, Bednarcik J, Milyutin V, Petryshynets I, Kollár P, Füzer J, Dilyova-Hatrakova M. High pressure compaction of soft magnetic iron powder. POWDER TECHNOL 2023. [DOI: 10.1016/j.powtec.2023.118434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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Walter MJ, Kohn SC, Pearson DG, Shirey SB, Speich L, Stachel T, Thomson AR, Yang J. Comment on "Discovery of davemaoite, CaSiO 3-perovskite, as a mineral from the lower mantle". Science 2022; 376:eabo0882. [PMID: 35536897 DOI: 10.1126/science.abo0882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Tschauner et al. (Reports, 11 November 2021, p. 891) present evidence that diamond GRR-1507 formed in the lower mantle. Instead, the data support a much shallower origin in cold, subcratonic lithospheric mantle. X-ray diffraction data are well matched to phases common in microinclusion-bearing lithospheric diamonds. The calculated bulk inclusion composition is too imprecise to uniquely confirm CaSiO3 stoichiometry and is equally consistent with inclusions observed in other lithospheric diamonds.
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Affiliation(s)
- Michael J Walter
- Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA
| | - Simon C Kohn
- School of Earth Sciences, University of Bristol, Bristol BS8 1TL, UK
| | - D Graham Pearson
- Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
| | - Steven B Shirey
- Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA
| | - Laura Speich
- Swiss Gemmological Institute SSEF, CH-4051 Basel, Switzerland
| | - Thomas Stachel
- Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
| | - Andrew R Thomson
- Department of Earth Sciences, University College London, London WC1E 6BT, UK
| | - Jing Yang
- Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA
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Huang H, Fan L, Liu X, Xu F, Wu Y, Yang G, Leng C, Wang Q, Weng J, Wang X, Cai L, Fei Y. Inner core composition paradox revealed by sound velocities of Fe and Fe-Si alloy. Nat Commun 2022; 13:616. [PMID: 35105891 PMCID: PMC8807611 DOI: 10.1038/s41467-022-28255-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 01/10/2022] [Indexed: 11/08/2022] Open
Abstract
Knowledge of the sound velocity of core materials is essential to explain the observed anomalously low shear wave velocity (VS) and high Poisson's ratio (σ) in the solid inner core. To date, neither VS nor σ of Fe and Fe-Si alloy have been measured under core conditions. Here, we present VS and σ derived from direct measurements of the compressional wave velocity, bulk sound velocity, and density of Fe and Fe-8.6 wt%Si up to ~230 GPa and ~5400 K. The new data show that neither the effect of temperature nor incorporation of Si would be sufficient to explain the observed low VS and high σ of the inner core. A possible solution would add carbon (C) into the solid inner core that could further decrease VS and increase σ. However, the physical property-based Fe-Si-C core models seemingly conflict with the partitioning behavior of Si and C between liquid and solid Fe.
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Affiliation(s)
- Haijun Huang
- School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Lili Fan
- School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Xun Liu
- School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Feng Xu
- School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Ye Wu
- School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Gang Yang
- School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Chunwei Leng
- School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Qingsong Wang
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China
| | - Jidong Weng
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China
| | - Xiang Wang
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China
| | - Lingcang Cai
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China
| | - Yingwei Fei
- Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC, 20015, USA.
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