Exploring microstructures in lower mantle mineral assemblages with synchrotron x-rays.

Exploring microstructures in lower mantle mineral assemblages with synchrotron x-rays.
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DOI:
10.1126/sciadv.abd3614
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发表时间:
2021-01
期刊:
影响因子:
13.6
通讯作者:
Wenk HR
Wenk HR
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chandler B;Bernier J;Diamond M;Kunz M;Wenk HR

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Multigrain crystallography at high pressures tracks microstructural evolution of minerals at lower mantle conditions. Understanding dynamics across phase transformations and the spatial distribution of minerals in the lower mantle is crucial for a comprehensive model of the evolution of the Earth’s interior. Using the multigrain crystallography technique (MGC) with synchrotron x-rays at pressures of 30 GPa in a laser-heated diamond anvil cell to study the formation of bridgmanite [(Mg,Fe)SiO3] and ferropericlase [(Mg,Fe)O], we report an interconnected network of a smaller grained ferropericlase, a configuration that has been implicated in slab stagnation and plume deflection in the upper part of the lower mantle. Furthermore, we isolated individual crystal orientations with grain-scale resolution, provide estimates on stress evolutions on the grain scale, and report {110} twinning in an iron-depleted bridgmanite, a mechanism that appears to aid stress relaxation during grain growth and likely contributes to the lack of any appreciable seismic anisotropy in the upper portion of the lower mantle.
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