@article{ea2981e7089d43e59c40398df1b91c6d,
title = "Deformation of Post-Spinel Under the Lower Mantle Conditions",
abstract = "To study the viscosity of bridgmanite and ferropericlase aggregate, uniaxial compression deformation experiments on pre-synthesized post-spinel phase and bridgmanite two-layered samples were conducted under top lower mantle pressure and 1773 K utilizing DT-Cup apparatus. Up to the strain of 0.25 ± 0.05, the observed comparable strain of the bridgmanite and post-spinel samples suggests the bridgmanite dominates the bulk viscosity of the post-spinel without strain localization in periclase. The microstructures of the deformed post-spinel samples show evidence of a similar strain of periclase with the bulk strain without strain partitioning. Texture analyses of bridgmanite indicate a dominant slip plane (100), with a steady state fabric strength achieved within the strain of 0.12 ± 0.01. The current experiment has provided no evidence about an onset of strain localization of ∼30 vol.% periclase at 0.25 strain. Our observations provide direct experimental verification of bridgmanite controlled rheology under low strain magnitude, which should be considered in geodynamical models which include mantle compositional and rheological evolution in the lower mantle.",
keywords = "deformation, lower mantle, post-spinel, rheology, strain localization",
author = "F. Xu and D. Yamazaki and Hunt, {S. A.} and N. Tsujino and Y. Higo and Y. Tange and K. Ohara and Dobson, {D. P.}",
note = "Funding Information: We would like to thank Hitoshi Gomi, Longjian Xie, Moe Sakurai, Chengcheng Zhao, Chao Liu, Wei Sun, Hongzhan Fei, Baohua Zhang for their help with the in situ experiments at BL04B1, SPring‐8, Japan. We also thank Longli Guan for periclase pole figure plotting. This project has received funding from the Natural Environment Research Council (NERC; Grant agreements NE/K002902/1 and NE/L006898/1 to DPD, and NE/P017525/2 to SAH). We thank Eiji Ito for his help with glass making at BL04B2, SPring‐8. We thank Yu Nishihara, Tomoaki Kubo and Takashi Yoshino for their support on experiment at University College London. The in situ experiments were performed under SPring‐8 Budding Researchers Support Proposals Numbers 2014B1778, 2015B1761 and 2016A1629. Visits to University College London (UCL) were made available through JSPS Kakenhi #15K21712. Funding Information: We would like to thank Hitoshi Gomi, Longjian Xie, Moe Sakurai, Chengcheng Zhao, Chao Liu, Wei Sun, Hongzhan Fei, Baohua Zhang for their help with the in situ experiments at BL04B1, SPring-8, Japan. We also thank Longli Guan for periclase pole figure plotting. This project has received funding from the Natural Environment Research Council (NERC; Grant agreements NE/K002902/1 and NE/L006898/1 to DPD, and NE/P017525/2 to SAH). We thank Eiji Ito for his help with glass making at BL04B2, SPring-8. We thank Yu Nishihara, Tomoaki Kubo and Takashi Yoshino for their support on experiment at University College London.?The in situ experiments were performed under SPring-8 Budding Researchers Support Proposals Numbers 2014B1778, 2015B1761 and 2016A1629. Visits to University College London (UCL) were made available through JSPS Kakenhi #15K21712. Publisher Copyright: {\textcopyright} 2022. The Authors.",
year = "2022",
month = mar,
doi = "10.1029/2021JB023586",
language = "English",
volume = "127",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",
number = "3",
}